CN113179117A - High speed data transmission system for satellite - Google Patents
High speed data transmission system for satellite Download PDFInfo
- Publication number
- CN113179117A CN113179117A CN202110422851.5A CN202110422851A CN113179117A CN 113179117 A CN113179117 A CN 113179117A CN 202110422851 A CN202110422851 A CN 202110422851A CN 113179117 A CN113179117 A CN 113179117A
- Authority
- CN
- China
- Prior art keywords
- data transmission
- phased array
- satellite
- data
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention relates to a high-speed data transmission system for a satellite, which is a dual-channel data transmission system, wherein each channel comprises two sets of data transmission subsystems, each set of data transmission subsystem comprises a data transmission terminal and a phased array antenna communicated with the data transmission terminal, and the polarization directions of the phased array antennas corresponding to the two channels are opposite; in each set of data transmission subsystem, the data transmission terminal is used for outputting a radio frequency signal to the phased array antenna according to data to be downloaded sent by a data source, and the data transmission terminal is also used for carrying out information interaction with a central computer through a CAN bus; the phased array antenna is used for completing control of the beam direction and wirelessly transmitting radio frequency signals to the ground station. The invention greatly improves the speed of data transmission between the satellite and the ground, utilizes the array element channel of the phased array antenna to independently control the switch technology, greatly improves the energy utilization efficiency of the satellite, and can adapt to different requirements of the satellite and ground data transmission tasks of the remote sensing satellite.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a high-speed data transmission system for a satellite.
Background
The satellite data transmission system is one of communication systems at a satellite end, has the main function of quickly and accurately transmitting a large amount of data on a satellite to a ground receiving station, is a unique communication interface for receiving effective data of a satellite remote sensing information image on the ground, and is also a communication interface for providing important guarantee for various remote sensing applications in multiple subsequent fields.
The remote sensing satellite usually works on a sun synchronous orbit with the height of 500-600km, taking the current sub-meter optical remote sensing satellite with the largest global width in the Jilin's one-number constellation as an example, the imaging data volume is about 19.2Gbps, the maximum continuous imaging time is 600s, if the imaging is performed for only 1 time every day, the total data volume is 11520Gb on the premise of not considering compression, if a single station is adopted for data downloading, the average overhead time is 400s, and the data transmission rate is 2-900 Mbps, the imaging data volume in one day can be completely downloaded by at least 16 turns. If the remote sensing satellite performs imaging for multiple times every day, more times of data transmission are planned to meet the requirement.
The wide-range transmissibility is another important index of the satellite-borne data transmission system. Within a limited time span when a satellite passes through China, the data transmission system with the large-range transmission condition can transmit more data volume under the same condition, and the satellite data downloading efficiency is improved. Currently, to solve this problem, there are generally three approaches: 1. a combination of a directional antenna and a two-dimensional mechanical turntable; 2. a two-dimensional phased array antenna; 3. a combination of a one-dimensional phased array antenna and a one-dimensional mechanical turntable. Compared with a mechanical turntable, the two-dimensional phased array antenna has the advantages of small size, light weight, high pointing accuracy, convenience in satellite attitude control and the like. According to the distribution conditions of the remote sensing satellite and the current data receiving ground station, when the electric scanning range meets +/-70 degrees, the satellite can transmit without barriers in the crossing process.
From the above analysis, the satellite data download rate and the antenna electric scanning coverage area have become short boards for obtaining remote sensing information service and application, and are a major issue to be solved urgently.
At present, in the satellites which are successfully in orbit in China, the remote sensing series satellites have higher requirements on data downloading capacity. The initial data transmission rate is only 10+ Mbps, and with the development of scientific research capability and technological breakthrough, the satellite data transmission rate in China is greatly improved. The spectrum 01 star and the spectrum 02 star of 'Jilin I' emitted by the Long light satellite company in 1 month and 21 months in 2019 have the highest code rate of 2 x 900Mbps, and the spectrum 01 star and the spectrum 02 star emitted by the space technology research institute general department of China aerospace technology group Limited in 11 months and 3 months in 2019 have the highest code rate of 2 x 1200 Mbps. It is necessary and urgent to further increase the data download rate of the satellite.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and a high-speed data transmission system for a satellite is provided, which can realize data transmission in a large angle range.
The technical means for solving the problems of the invention is as follows:
a high-speed data transmission system for a satellite is a dual-channel data transmission system, each channel comprises two sets of data transmission subsystems, each set of data transmission subsystem comprises a data transmission terminal and a phased array antenna communicated with the data transmission terminal, and the polarization directions of the phased array antennas corresponding to the two channels are opposite;
in each set of data transmission subsystem, the data transmission terminal is used for receiving data to be downloaded sent by a data source, outputting a radio frequency signal to the phased array antenna according to the data to be downloaded, sending antenna beam pointing angle information to the phased array antenna and receiving telemetering data sent by the phased array antenna, and the data transmission terminal is further used for carrying out information interaction with a central computer through a CAN bus and finishing the switching of a modulation mode, the switching of a data transmission rate, the switching of a data transmission task mode, the acquisition of the telemetering information of the data transmission terminal and the uploading of the telemetering data of the phased array antenna and the telemetering information of the data transmission terminal according to an instruction sent by the central computer;
the phased array antenna is used for receiving the radio frequency signals sent by the data transmission terminal, receiving and analyzing the antenna beam pointing angle information sent by the data transmission terminal, controlling the beam direction, and wirelessly transmitting the radio frequency signals to the ground station, and is also used for collecting the telemetry data of the phased array antenna and transmitting the telemetry data to the data transmission terminal through a corresponding communication interface.
The invention provides a novel high-speed data transmission system for a remote sensing satellite, which greatly improves the speed of data transmission between satellites and the ground, makes full use of the characteristic that a phased array antenna has a large pointing angle range, and simultaneously utilizes an array element channel of the phased array antenna to independently control a switching technology, thereby greatly improving the energy utilization efficiency of the satellite and being capable of meeting different requirements of satellite-ground data transmission tasks of the remote sensing satellite. The invention has the following beneficial effects:
(1) the invention supports a plurality of modulation modes, and can randomly switch and select the modulation modes according to the instructions about the satellite-ground task issued by the central computer, wherein the modulation modes comprise 32QAM modulation, 16QAM modulation, 8PSK modulation, QPSK modulation and the like;
(2) the invention supports a plurality of data transmission rate modes, is convenient to meet the requirements of satellite-ground data transmission tasks under different working conditions, different data transmission rates can be switched and selected through instructions issued by a central computer, and single-channel data transmission rates comprise 1.5Gbps, 1.2Gbps, 900Mbps, 600Mbps, 300Mbps, 150Mbps and the like;
(3) the invention adopts the phased array antenna polarization multiplexing technology, the phased array antennas of the two channels are respectively a left-hand circularly polarized phased array antenna and a right-hand circularly polarized phased array antenna, the phased array antennas of the two channels can work simultaneously and do not interfere with each other, the satellite-ground data transmission rate can achieve the effect of multiplication, the two-channel data downloading rate can combine the single-channel data transmission rate at will according to different requirements of satellite-ground tasks, and the highest single-channel data transmission rate can reach 3Gbps (2 multiplied by 1.5 Gbps);
(4) the invention utilizes the characteristic of large range of the pointing angle of the phased array antenna, so that the satellite based on the invention can adopt a plurality of data transmission task modes, including a real-time data transmission mode, a delay data transmission mode and a staring data transmission mode, and the satellite-ground data transmission task can be more flexible, the application range is wider, and the ground resource application is more sufficient by the plurality of data transmission modes;
(5) the invention utilizes the phased array antenna array element channel to independently control the switching technology, can determine the opening quantity of the phased array antenna array element channels according to the difference of data transmission rate and modulation mode, reasonably uses the energy requirement, is convenient for the control of the whole satellite energy, effectively improves the utilization efficiency of the satellite energy, makes the energy distribution more scientific and saves the resources;
(6) the invention adopts a dual-channel backup design framework, and each channel is provided with two sets of data transmission subsystems which are backed up with each other, thereby ensuring the reliability of a data transmission link, simultaneously reserving an interface for subsequent expansion frequency points and having more flexible design.
Drawings
FIG. 1 is a schematic diagram of a high speed data transmission system for satellites in accordance with the present invention;
FIG. 2 is a schematic diagram of a data transmission terminal according to the present invention;
FIG. 3 is a schematic diagram of a phased array antenna of the present invention;
FIG. 4 is a layout diagram of antenna array elements of the antenna array unit of the present invention;
FIG. 5 is a schematic diagram showing the relative positions of the satellite, the shooting point and the ground station in the real-time data transmission mode;
FIG. 6 is a schematic diagram showing the relative positions of the satellite, the shooting point and the ground station in the delayed data transmission mode;
fig. 7 is a schematic diagram of relative positions of a satellite, a shooting point and a ground station in a staring data transmission mode.
Detailed Description
The following detailed description of embodiments of the invention is provided in connection with the accompanying drawings and the examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides a high-speed data transmission system for a satellite, the schematic diagram of which is shown in figure 1, the high-speed data transmission system is a dual-channel data transmission system and comprises two data transmission channels, each channel comprises two identical data transmission subsystems, each data transmission subsystem comprises a data transmission terminal and a phased array antenna communicated with the data transmission terminal, and the polarization directions of the two phased array antennas corresponding to the first channel and the second channel are opposite. The performance indexes and various parameters of the four data transmission terminals are completely consistent, and the performance indexes and various parameters of the four phased array antennas are completely consistent except for inconsistent rotation directions. The high-speed data transmission system of the invention adopts the polarization multiplexing technology to realize the simultaneous data transmission of two channels, so that two phased array antennas corresponding to one channel are in left-hand circular polarization, and two phased array antennas corresponding to the other channel are in right-hand circular polarization.
Specifically, still referring to fig. 1, payload 1 and payload 2 of fig. 1 are data sources for transmitting image data to a data transmission system; the power supply subsystem provides a primary power supply for the whole high-speed data transmission system; the central computer performs information interaction with the high-speed data transmission system through the CAN bus, and mainly completes command issuing, response and telemetering acquisition.
In each set of data transmission subsystem, the data transmission terminal is used for receiving data to be downloaded sent by a data source (load 1 or load 2 in fig. 1) and outputting a radio frequency signal to a phased array antenna communicated with the data transmission terminal according to the data to be downloaded; the data transmission terminal is also used for sending the antenna beam pointing angle information to the phased array antenna and receiving telemetering data sent by the phased array antenna; the data transmission terminal also carries out information interaction with a central computer through a CAN bus, and is used for completing switching of a modulation mode (32QAM modulation, 16QAM modulation, 8PSK modulation and QPSK modulation), switching of data transmission rate (1.5Gbps, 1.2Gbps, 900Mbps, 600Mbps, 300Mbps and 150Mbps), switching of a data transmission task mode (a real-time data transmission mode, a delayed data transmission mode and a staring data transmission mode), acquisition of remote measurement information of the data transmission terminal, uploading of the remote measurement data of the phased array antenna and the remote measurement information of the data transmission terminal and the like according to an instruction issued by the central computer.
Further, the data transmission terminal mainly comprises a baseband module, a radio frequency module and a power module, a schematic diagram of the data transmission terminal is shown in fig. 2, wherein the baseband module comprises an ultra-high speed data interface, a processing chip, a D/a converter, an FPGA chip, a communication interface and an ARM processor, the radio frequency module comprises a clock sub-module, an intermediate frequency filtering sub-module, an up-conversion sub-module and a filtering amplification sub-module, and the power module converts a primary power into a secondary power and then respectively supplies power to the baseband module and the radio frequency module.
The baseband module has three main functions:
1) receiving a high-speed data stream of a load, scrambling, coding and performing intermediate frequency modulation on data, and then sending an intermediate frequency modulation signal to a radio frequency channel, specifically, sending data to be downloaded sent by a data source to a processing chip through an ultra-high-speed data interface, sending the data to be downloaded to a D/A converter after the data to be downloaded is subjected to scrambling, coding (such as LPDC coding) and intermediate frequency modulation in sequence by the processing chip, outputting the intermediate frequency modulation signal to an intermediate frequency filtering submodule by the D/A converter, and generating a sampling clock signal used by the D/A converter by the clock submodule; optionally, the type of the processing chip in this embodiment is XC74K10T, and the ultra-high speed data interface is TLK 2711;
2) the processing chip is communicated with the phased array antenna through the FPGA chip and the communication interface, and sends the antenna beam pointing angle information to the phased array antenna and receives telemetering data sent by the phased array antenna through the FPGA chip and the communication interface; optionally, in this embodiment, the model of the FPGA chip is A3PE3000, a parallel port is formed between the A3PE3000 chip and the processing chip, and the communication interface is an RS422 interface;
3) the processing chip is communicated with the central computer through the ARM processor and the CAN bus, specifically, the processing chip receives bus data, completes switching of corresponding working states according to an instruction issued by the central computer, and comprises switching of modulation modes, switching of data transmission rates and switching of data transmission task modes, and is further used for completing acquisition of telemetering information of the data transmission terminal and uploading of telemetering data of the phased array antenna and telemetering information of the data transmission terminal according to the instruction. The ARM processor is connected with the processing chip through the SPI, and the ARM processor is connected with the FPGA chip through the SPI.
The main functions of the radio frequency module are: and the intermediate frequency modulation signal output by the D/A converter is subjected to filtering processing of an intermediate frequency filtering submodule, up-conversion processing of an up-conversion submodule and filtering and power amplification processing of a filtering amplification submodule in sequence to obtain a radio frequency signal, and the radio frequency signal is output to a phased array antenna for wireless transmission.
The phased array antenna is used for receiving radio frequency signals sent by the data transmission terminal, receiving and analyzing antenna beam pointing angle information sent by the data transmission terminal, controlling the beam direction, and wirelessly transmitting the radio frequency signals to the ground station, and is also used for collecting self telemetering data and transmitting the telemetering data to the data transmission terminal through a corresponding communication interface.
Furthermore, the phased array antenna includes an antenna array unit, a transmitting unit, a feeding network unit, a beam control unit and a power supply unit, and a schematic diagram is shown in fig. 3, where the antenna array unit includes N1 × N2 antenna array elements, and every N2 antenna array elements form an antenna array tuple, which totally amounts to N1 antenna array tuples, the transmitting unit includes N1 transmitting assemblies connected with N1 antenna array tuples in a one-to-one correspondence manner, and the power supply unit converts a primary power supply into a secondary power supply and then respectively supplies power to the transmitting unit, the feeding network unit and the beam control unit. Optionally, the voltage of the secondary power converted by the power supply unit is + 5V.
Phased array antennas have three main functions:
1) the feed network unit receives the radio frequency signal output by the radio frequency module in the data transmission terminal through the primary drive circuit, completes the shunting of the radio frequency signal, equally divides the radio frequency signal into N1 paths and then sends the radio frequency signal to each transmitting assembly, and simultaneously, each transmitting assembly equally divides the received radio frequency signal into N2 paths, amplifies and transfers the radio frequency signal to the antenna array element corresponding to the transmitting assembly. The phased array antenna has the function of independent on-off of each path of assembly, and is convenient for energy consumption saving, failure isolation and problem troubleshooting. The antenna array units are arranged in a triangular grid array in a form of a dielectric horn, fig. 4 shows an antenna array element arrangement pattern of the antenna array units in the invention, and each antenna array element can be opened or closed arbitrarily according to instructions.
Optionally, in this embodiment, the value of N1 is 6, and the value of N2 is 4, it should be noted that fig. 3 only illustrates a schematic diagram of the phased array antenna in this embodiment by taking N1 ═ 6 and N2 ═ 4 as examples, and for those skilled in the art, an appropriate value of N1 and N2 may be selected according to actual situations;
2) the beam control unit receives and analyzes the antenna beam pointing angle information sent by the data transmission terminal, calculates phase information of each antenna array element and sends the phase information to a corresponding transmitting component, and the transmitting component controls the beam direction through a control parameter shifting device according to the phase information;
3) the transmitting unit is also used for acquiring the telemetering data of the antenna array surface unit and transmitting the telemetering data to the data transmission terminal through the beam control unit.
The invention provides a novel high-speed data transmission system for a remote sensing satellite, which greatly improves the speed of data transmission between satellites and the ground, makes full use of the characteristic that a phased array antenna has a large pointing angle range, and simultaneously utilizes an array element channel of the phased array antenna to independently control a switching technology, thereby greatly improving the energy utilization efficiency of the satellite and being capable of meeting different requirements of satellite-ground data transmission tasks of the remote sensing satellite. The invention has the following beneficial effects:
(1) the invention supports a plurality of modulation modes, and can randomly switch and select the modulation modes according to the instructions about the satellite-ground task issued by the central computer, wherein the modulation modes comprise 32QAM modulation, 16QAM modulation, 8PSK modulation, QPSK modulation and the like;
(2) the invention supports a plurality of data transmission rate modes, is convenient to meet the requirements of satellite-ground data transmission tasks under different working conditions, different data transmission rates can be switched and selected through instructions issued by a central computer, and single-channel data transmission rates comprise 1.5Gbps, 1.2Gbps, 900Mbps, 600Mbps, 300Mbps, 150Mbps and the like;
(3) the invention adopts the phased array antenna polarization multiplexing technology, the phased array antennas of the two channels are respectively a left-hand circularly polarized phased array antenna and a right-hand circularly polarized phased array antenna, the phased array antennas of the two channels can work simultaneously and do not interfere with each other, the satellite-ground data transmission rate can achieve the effect of multiplication, the two-channel data downloading rate can combine the single-channel data transmission rate at will according to different requirements of satellite-ground tasks, and the highest single-channel data transmission rate can reach 3Gbps (2 multiplied by 1.5 Gbps);
(4) the invention utilizes the characteristic of large range of the pointing angle of the phased array antenna, so that the satellite based on the invention can adopt a plurality of data transmission task modes, including a real-time data transmission mode, a delay data transmission mode and a staring data transmission mode, and the satellite-ground data transmission task can be more flexible, the application range is wider, and the ground resource application is more sufficient by the plurality of data transmission modes;
(5) the invention utilizes the phased array antenna array element channel to independently control the switching technology, can determine the opening quantity of the phased array antenna array element channels according to the difference of data transmission rate and modulation mode, reasonably uses the energy requirement, is convenient for the control of the whole satellite energy, effectively improves the utilization efficiency of the satellite energy, makes the energy distribution more scientific and saves the resources;
(6) the invention adopts a dual-channel backup design framework, and each channel is provided with two sets of data transmission subsystems which are backed up with each other, thereby ensuring the reliability of a data transmission link, simultaneously reserving an interface for subsequent expansion frequency points and having more flexible design.
The invention can increase the data download rate to the highest 3Gbps (2 multiplied by 1.5Gbps) by adopting the polarization multiplexing technology of the phased array antenna, and can select multi-gear rates (2 multiplied by 1.5Gbps, 2 multiplied by 1.2Gbps, 2 multiplied by 900Mbps, 2 multiplied by 600Mbps, 2 multiplied by 300Mbps and 2 multiplied by 150Mbps) and modulation modes (32QAM, 16QAM, 8PSK and QPSK) by instruction switching. According to different data downloading rates and different transmission environments, the number of array elements of the phased array antenna can be controlled through instructions, satellite energy is saved, the electric scanning range of the phased array antenna can reach 0-70 degrees of off-axis angle and 0-360 degrees of azimuth angle, and dual-channel high-speed large-range data transmission of a satellite to the ground is achieved.
The invention provides a high-speed satellite data transmission system capable of transmitting in a large angle range, which can switch a modulation mode and a data transmission rate at will according to instructions. Under the 32QAM modulation mode, the data transmission system supports the single-channel 1.5Gbps data transmission rate, and the dual-channel 3Gbps data transmission rate can be realized by utilizing the polarization multiplexing technology. Under the 16QAM modulation mode, the data transmission system supports the data transmission rate of a single channel at 1.2Gbps, and the data transmission rate of a double channel at 2.4Gbps can be realized by utilizing the polarization multiplexing technology. Under the 8PSK modulation mode, the data transmission system supports the data transmission rate of a single channel 900Mbps, and the data transmission rate of a double channel 1.8Gbps can be realized by utilizing the polarization multiplexing technology. Under the QPSK modulation mode, the data transmission system supports the data transmission rates of 600Mbps, 300Mbps and 150Mbps in a single channel, and the data transmission rates of 1.2Gbps, 600Mbps and 300Mbps in double channels can be realized by utilizing the polarization multiplexing technology. All modulation modes and data transmission rates can be switched according to instructions, so that the task form is more flexible, and the application range is expanded.
The invention supports multiple modulation modes, and different modulation modes have different threshold signal-to-noise ratios under the same index of the bit error rate requirement (for example, when the bit error rate requirement is less than 10)-7When in use, the threshold signal-to-noise ratio of QPSK is 11.4, the threshold signal-to-noise ratio of 8PSK is 14.7, the threshold signal-to-noise ratio of 16QAM is 15.5, and the threshold signal-to-noise ratio of 32QAM is 19), and considering that the symbol rates of different data transmission rates are different, therefore, the minimum Effective omnidirectional radiation Power (EIRP) required for each modulation mode and data transmission rate is different. As shown in table 1, which is a result of calculating the space link margin of the data transmission system of the present invention, it can be known from table 1 that when a 12-meter ground station is used for data reception, if a 32QAM modulation mode is adopted to stare at a data transmission mode, the data transmission rate is 1500Mbps, and the satellite-ground link margin is 3.1dB under the condition that all antenna elements are opened to full load operation. If the modulation order is lowered under the same condition and a QPSK modulation scheme is used to transmit data at 150Mbps, the satellite-to-ground link margin is 21.9dB, which results in a large link margin. Therefore, the energy is greatly wasted, and therefore, through the technology of individually controlling the array elements of the phased array antenna,according to different tuning modes and transmission rates required by tasks, the number of array elements of the phased array antenna is adaptively started, and the satellite-ground link margin is guaranteed to meet 3dB required by engineering, so that the heat consumption can be reduced, the satellite temperature control is facilitated, the energy consumption can be reduced, and the satellite resources are saved.
Table 1 calculation result of space link margin of high speed data transmission system of the present invention
The high-speed data transmission system with the large-angle range transmission function can be applied to various data transmission service modes: a real-time data transmission mode, a delayed data transmission mode, a staring data transmission mode and the like.
And (3) real-time data transmission mode: fig. 5 is a schematic diagram showing a relative position relationship between a satellite, a shooting point and a ground station in a real-time data transmission mode, when a satellite imaging system shoots an interested target, if the ground station exists in a transmission range of a phased array antenna (within a normal cone angle range of +/-70 degrees of the phased array antenna), data of the imaging system can be transmitted to the ground in real time through the high-speed data transmission system adopting the polarization multiplexing technology, and then image processing and processing are performed, so that a position image of the interested target of the satellite can be quickly restored, and thus, the service requirement of real-time data transmission is realized. The business mode has the characteristic of quick response in time, has irreplaceable advantages in various fields such as communication, navigation, traffic, military, agriculture and forestry and the like, and plays an important role in the modern scientific and technological era of advocating 'fast rhythm' and 'high efficiency'.
The delayed data transmission mode comprises the following steps: fig. 6 is a schematic diagram showing a relative position relationship among a satellite, a shooting point and a ground station in the delayed data transmission mode, and after the satellite imaging system finishes shooting an interested target, image data is stored in the imaging system. When the satellite passes through a ground station at a proper place and the ground station is also in a transmission range of the phased array antenna (within a range of a normal cone angle of +/-70 degrees of the phased array antenna), image data can be transmitted to the data transmission system by the imaging system and is transmitted to the ground by the two paths of polarized and multiplexed phased array antennas, and the ground station receives the data and then processes and processes the data to restore an interested target image shot by the satellite. The service mode can reduce the instantaneous energy consumption of the satellite, and is mainly adopted when an interest target point is out of the country or a receiving ground station is limited. Meanwhile, the service mode can download data of multiple imaging tasks in one data transmission task, so that the service efficiency of multiple systems of the satellite is improved.
Staring at a data transmission mode: fig. 7 is a schematic diagram showing the relative position relationship between the satellite, the shooting point and the ground station in the staring data transmission mode, and when the satellite imaging system finishes shooting the target of interest, the image data is stored in the imaging system. When the satellite passes by the ground station, the attitude of the whole satellite is adjusted, so that the normal direction of the phased array antenna is aligned to the normal direction of the ground station, namely, the electric scanning function of the phased array antenna is not switched on. The image data can be transmitted to the data transmission system of the invention by the imaging system, and is transmitted to the ground by the two polarization multiplexing phased array antennas, and the ground station processes and processes the data after receiving the data, and recovers the interested target image shot by the satellite. Under the data transmission task mode, the EIRP of the data transmission system is the highest, and the data transmission system is suitable for the conditions of poor transmission channel conditions, such as the conditions of cloud, rain and the like when the air attenuation is large or other electromagnetic interference exists nearby.
In conclusion, the invention not only obviously improves the data transmission capability of a single channel, but also greatly improves the data transmission capability of two channels by utilizing the polarization multiplexing technology, can rapidly download a large amount of satellite image data, and widens the road for obtaining remote sensing images. Meanwhile, by using the phased array antenna array individually controllable technology, the adaptive modulation mode and the data transmission rate are matched, the power consumption of a data transmission system can be saved, the requirement on the whole satellite energy is reduced, and the energy efficiency utilization rate is improved. The invention has wider application range and is suitable for various task requirements.
Various modifications and changes may be made by those skilled in the art to the design of the high speed data transmission system of the present invention capable of wide angular range transmission without departing from the essential scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A high-speed data transmission system for a satellite is characterized in that the high-speed data transmission system for the satellite is a dual-channel data transmission system, each channel comprises two sets of data transmission subsystems, each set of data transmission subsystem comprises a data transmission terminal and a phased array antenna communicated with the data transmission terminal, and the polarization directions of the phased array antennas corresponding to the two channels are opposite;
in each set of data transmission subsystem, the data transmission terminal is used for receiving data to be downloaded sent by a data source, outputting a radio frequency signal to the phased array antenna according to the data to be downloaded, sending antenna beam pointing angle information to the phased array antenna and receiving telemetering data sent by the phased array antenna, and the data transmission terminal is further used for carrying out information interaction with a central computer through a CAN bus and finishing the switching of a modulation mode, the switching of a data transmission rate, the switching of a data transmission task mode, the acquisition of the telemetering information of the data transmission terminal and the uploading of the telemetering data of the phased array antenna and the telemetering information of the data transmission terminal according to an instruction sent by the central computer;
the phased array antenna is used for receiving the radio frequency signals sent by the data transmission terminal, receiving and analyzing the antenna beam pointing angle information sent by the data transmission terminal, controlling the beam direction, and wirelessly transmitting the radio frequency signals to the ground station, and is also used for collecting the telemetry data of the phased array antenna and transmitting the telemetry data to the data transmission terminal through a corresponding communication interface.
2. The high-speed data transmission system for the satellite of claim 1, wherein the data transmission terminal comprises a baseband module, a radio frequency module and a power module, the baseband module comprises an ultra-high-speed data interface, a processing chip, a D/a converter, an FPGA chip, a communication interface and an ARM processor, the radio frequency module comprises a clock sub-module, an intermediate frequency filter sub-module, an up-conversion sub-module and a filter amplification sub-module, and the power module converts a primary power into a secondary power and then respectively supplies power to the baseband module and the radio frequency module;
the data to be downloaded sent by the data source is sent to the processing chip through the ultra-high-speed data interface, the processing chip carries out scrambling, coding and intermediate frequency modulation processing on the data to be downloaded in sequence and then sends the data to the D/A converter, the D/A converter outputs an intermediate frequency modulation signal to the intermediate frequency filtering submodule, the clock submodule is used for generating a sampling clock signal used by the D/A converter, and the processing chip is communicated with the phased array antenna through the FPGA chip and the communication interface and communicated with the central computer through the ARM processor and the CAN bus;
and the intermediate frequency modulation signal is sequentially subjected to filtering processing of the intermediate frequency filtering submodule, up-conversion processing of the up-conversion submodule and filtering and power amplification processing of the filtering amplification submodule to obtain the radio frequency signal.
3. The high-speed data transmission system for the satellite of claim 1 or 2, wherein the phased array antenna comprises an antenna array unit, a transmitting unit, a feed network unit, a beam control unit and a power supply unit, the antenna array unit comprises N1 × N2 antenna elements, every N2 antenna elements form an antenna array element group, the transmitting unit comprises N1 transmitting assemblies connected with the antenna array element group in a one-to-one correspondence, and the power supply unit converts a primary power supply into a secondary power supply and then respectively supplies power to the transmitting unit, the feed network unit and the beam control unit;
the feed network unit receives the radio frequency signal through a primary drive circuit, equally divides the radio frequency signal into N1 paths and then sends the signals to each transmitting assembly, and each transmitting assembly equally divides the received radio frequency signal into N2 paths, amplifies the signals, shifts the signals and then sends the signals to the corresponding antenna array element;
the beam control unit receives and analyzes the antenna beam pointing angle information sent by the data transmission terminal, calculates phase information of each antenna array element and sends the phase information to the corresponding transmitting component, and the transmitting component controls the beam direction through a control item shifter according to the phase information;
the transmitting unit is also used for acquiring the telemetering data of the antenna array surface unit and sending the telemetering data to the data transmission terminal through the beam control unit.
4. High speed data transmission system for satellites according to claim 3,
the value of N1 is 6, and the value of N2 is 4.
5. High speed data transmission system for satellites according to claim 1 or 2,
the modulation modes comprise 32QAM modulation, 16QAM modulation, 8PSK modulation and QPSK modulation.
6. High speed data transmission system for satellites according to claim 1 or 2,
the data transmission rates include 1.5Gbps, 1.2Gbps, 900Mbps, 600Mbps, 300Mbps, and 150 Mbps.
7. High speed data transmission system for satellites according to claim 1 or 2,
the data transmission task mode comprises a real-time data transmission mode, a delayed data transmission mode and a staring data transmission mode.
8. High speed data transmission system for satellites according to claim 2,
the type of the processing chip is XC74K10T, and the type of the FPGA chip is A3PE 3000.
9. High speed data transmission system for satellites according to claim 2,
the ultra-high speed data interface is a TLK2711 high-speed data interface, and the communication interface is an RS422 interface.
10. High speed data transmission system for satellites according to claim 2,
the voltage of the secondary power supply is + 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110422851.5A CN113179117A (en) | 2021-04-20 | 2021-04-20 | High speed data transmission system for satellite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110422851.5A CN113179117A (en) | 2021-04-20 | 2021-04-20 | High speed data transmission system for satellite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113179117A true CN113179117A (en) | 2021-07-27 |
Family
ID=76923760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110422851.5A Pending CN113179117A (en) | 2021-04-20 | 2021-04-20 | High speed data transmission system for satellite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113179117A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890590A (en) * | 2021-10-12 | 2022-01-04 | 北京微纳星空科技有限公司 | Satellite-borne data transmission transmitting device, system and intelligent terminal |
| CN114153191A (en) * | 2021-11-23 | 2022-03-08 | 中国人民解放军63920部队 | Spacecraft control method, device and system |
| CN115441924A (en) * | 2022-06-28 | 2022-12-06 | 中国科学院微小卫星创新研究院 | High-speed data transmission system applied to inertial directional small satellite |
| CN115567096A (en) * | 2022-09-27 | 2023-01-03 | 上海航天测控通信研究所 | Automatic control satellite data transmission channel system |
| CN115765831A (en) * | 2022-10-21 | 2023-03-07 | 中国电子科技集团公司第十研究所 | One-station two-satellite communication system and method under same-orbit two-satellite coverage |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1443735B1 (en) * | 2003-01-29 | 2013-03-13 | Globalstar L.P. | Simplex remote telemetry via a satellite system |
| WO2016193142A1 (en) * | 2015-05-29 | 2016-12-08 | Avanti Communications Group Plc | Satellite communication |
| CN107968678A (en) * | 2017-11-27 | 2018-04-27 | 长光卫星技术有限公司 | A kind of New Satellite high speed data transmission system |
| CN108964741A (en) * | 2018-06-15 | 2018-12-07 | 上海卫星工程研究所 | A kind of spaceborne X frequency range high-speed digital transmission system |
| CN109004950A (en) * | 2018-08-08 | 2018-12-14 | 长光卫星技术有限公司 | A kind of method and system solving telemetered signal and number communication mutual interference |
| CN109981162A (en) * | 2019-03-27 | 2019-07-05 | 北京空间飞行器总体设计部 | Data processing and Transmission system suitable for inertial space pointing space astronomical satellite |
| CN111478726A (en) * | 2020-05-27 | 2020-07-31 | 中国科学院微小卫星创新研究院 | Communication system for small communication satellite |
| CN111624629A (en) * | 2020-07-02 | 2020-09-04 | 天津七六四通信导航技术有限公司 | Four-array element B1/L1 low-weight low-power consumption satellite anti-interference antenna and implementation method |
-
2021
- 2021-04-20 CN CN202110422851.5A patent/CN113179117A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1443735B1 (en) * | 2003-01-29 | 2013-03-13 | Globalstar L.P. | Simplex remote telemetry via a satellite system |
| WO2016193142A1 (en) * | 2015-05-29 | 2016-12-08 | Avanti Communications Group Plc | Satellite communication |
| CN107968678A (en) * | 2017-11-27 | 2018-04-27 | 长光卫星技术有限公司 | A kind of New Satellite high speed data transmission system |
| CN108964741A (en) * | 2018-06-15 | 2018-12-07 | 上海卫星工程研究所 | A kind of spaceborne X frequency range high-speed digital transmission system |
| CN109004950A (en) * | 2018-08-08 | 2018-12-14 | 长光卫星技术有限公司 | A kind of method and system solving telemetered signal and number communication mutual interference |
| CN109981162A (en) * | 2019-03-27 | 2019-07-05 | 北京空间飞行器总体设计部 | Data processing and Transmission system suitable for inertial space pointing space astronomical satellite |
| CN111478726A (en) * | 2020-05-27 | 2020-07-31 | 中国科学院微小卫星创新研究院 | Communication system for small communication satellite |
| CN111624629A (en) * | 2020-07-02 | 2020-09-04 | 天津七六四通信导航技术有限公司 | Four-array element B1/L1 low-weight low-power consumption satellite anti-interference antenna and implementation method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890590A (en) * | 2021-10-12 | 2022-01-04 | 北京微纳星空科技有限公司 | Satellite-borne data transmission transmitting device, system and intelligent terminal |
| CN114153191A (en) * | 2021-11-23 | 2022-03-08 | 中国人民解放军63920部队 | Spacecraft control method, device and system |
| CN114153191B (en) * | 2021-11-23 | 2024-05-03 | 中国人民解放军63920部队 | Spacecraft control method, device and system |
| CN115441924A (en) * | 2022-06-28 | 2022-12-06 | 中国科学院微小卫星创新研究院 | High-speed data transmission system applied to inertial directional small satellite |
| CN115567096A (en) * | 2022-09-27 | 2023-01-03 | 上海航天测控通信研究所 | Automatic control satellite data transmission channel system |
| CN115567096B (en) * | 2022-09-27 | 2024-10-25 | 上海航天测控通信研究所 | Automatically controlled satellite data transmission channel system |
| CN115765831A (en) * | 2022-10-21 | 2023-03-07 | 中国电子科技集团公司第十研究所 | One-station two-satellite communication system and method under same-orbit two-satellite coverage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113179117A (en) | High speed data transmission system for satellite | |
| CN105449362B (en) | A kind of double star dualbeam S band satellite communication phased array antenna | |
| US20180205448A1 (en) | Distributed satcom aperture on fishing boat | |
| CN114204982B (en) | High-low orbit general-purpose wide-frequency satellite communication system and method | |
| CN101316130A (en) | Community antenna system and method in closed loop mode | |
| CN111934744B (en) | Relay satellite rocket-borne user terminal system equipment | |
| US20160269100A1 (en) | Satellite laser communications relay node | |
| CN111934746B (en) | Inter-satellite communication integration method and device for low-orbit satellite and other high-orbit and low-orbit satellites | |
| CN115765831B (en) | One-station double-star satellite communication system and method under same-orbit double-star coverage | |
| CN114067548A (en) | Mutual backup dual-link communication method for rotor unmanned aerial vehicle | |
| CN107968678A (en) | A kind of New Satellite high speed data transmission system | |
| CN113131994A (en) | Integrated intelligent shipborne satellite communication system | |
| CN213754769U (en) | Remote-control integrated multilink high-speed data communication load system | |
| CN108964740B (en) | Omnidirectional inter-satellite communication link based on double-satellite flying around formation | |
| Zeedan et al. | CubeSat Communication Subsystems: A Review of On-Board Transceiver Architectures, Protocols, and Performance | |
| Pan et al. | Space simultaneous information and power transfer: An enhanced technology for miniaturized satellite systems | |
| US11424796B1 (en) | Panel Serializer/Deserializer (SerDes) routing | |
| CN214851265U (en) | Phased array antenna, distributed phased array antenna and V2X road side unit | |
| US11641067B1 (en) | Passive antenna elements used to fill gaps in a paneltzed phased array antenna | |
| RU191165U1 (en) | UNMANNED AIRCRAFT RADIO COMMUNICATION TERMINAL | |
| CN214101379U (en) | Inter-satellite communication system for low-orbit micro-nano satellite | |
| CN113794502B (en) | Mars surrounding device measurement and control data transmission integrated system and method | |
| CN115314066B (en) | Measurement and control communication device and method for deep space exploration spacecraft | |
| CN112969156B (en) | Unmanned aerial vehicle, communication method, command control station, information sheet receiving station and reconnaissance system | |
| CN110995332B (en) | IGSO-based frequency hopping time hopping data link communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210727 |
|
| WD01 | Invention patent application deemed withdrawn after publication |