CN205574230U - AIS on -board terminal based on big dipper high accuracy - Google Patents
AIS on -board terminal based on big dipper high accuracy Download PDFInfo
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Abstract
The utility model discloses a AIS on -board terminal based on big dipper high accuracy, include: big dipper satellite data is received from big dipper satellite to the antenna, communication module for the system receives difference information from the reinforcing of big dipper ground, the framing signal that obtains with antenna and communication module communication connection, according to big dipper satellite data of receiving from the antenna and the difference information of receiving from communication module, is exported to the differential positioning module behind the calculus of differences. The utility model has the advantages of, utilize the communication between differential positioning module and the beidou system to utilize and to carry out differential positioning with the differential data on ground, can improve the precision of ship location, accurate to the meter level do not.
Description
Technical field
This utility model relates to field of locating technology, particularly relates to a kind of based on the high-precision AIS of the Big Dipper
Shipborne terminal.
Background technology
AIS (Automatic Identification System, ship automatic identification system) is by bank base (base
Stand) facility and ship-borne equipment collectively constitute, be a kind of novel collection network technology, modern communications technology,
Digital navaid that computer technology, electronic information Display Technique are integrated and equipment.Boats and ships are automatic
Identification system (AIS) is born in the nineties in 20th century, the radio recognition equipment of naval vessel, aircraft develop
Form.AIS ship mounted terminal with AIS system coordinates global positioning system (GPS) by accommodation, ship
Speed, the Ship dynamic situation such as rate and course that changes course combine name of vessel, wail, absorb water and the ship such as hazardous cargo
Oceangoing ship static data is broadcasted to Its Adjacent Waters boats and ships and base station by very high frequency(VHF) (VHF), make neighbouring boats and ships and
Base station can grasp the dynamic static information of all boats and ships in neighbouring sea in time, is able to association of conversing the most mutually
Adjust, take necessary Anti-collision Actions, effective guarantee navigation safety.
AIS equipment is to rely on global positioning system (GPS), by the space station of its system, earth station
GPS on computer and ship receives gps satellite signal, determines accommodation, broadcasts accommodation.By
The coordinate system used in GPS is inconsistent with some waters, GPS is limited by the provided precision of U.S. government
System and all kinds of physical condition, there is error at the accommodation that GPS records, then creates portion
Divide and rest in harbour or cast anchor at the boats and ships in anchorage, having electronic chart and the radar of AIS information fusion
In image, its AIS labelling (acute angle isosceles triangle) there will be position deviation, as on the coast or in navigation channel
Medium；Part boats and ships are with the naked eye observed in the orientation that dead ahead is to the left, but at electronic chart or radar
In display, AIS labelling appears in the orientation that dead ahead even dead ahead is to the right etc..
Therefore, there is the problem that position error is the biggest in existing Shipborne terminal.
Utility model content
For solving the problem that prior art exists, this utility model provides a kind of AIS ship mounted terminal,
Accurate ship location can be carried out.
A kind of based on the Big Dipper high-precision AIS ship mounted terminal, including:
Antenna, receives big-dipper satellite data from big-dipper satellite；
Communication module, receives difference information for strengthening system from Big Dipper ground；
Differential positioning module, communicates to connect, according to the north received from antenna with antenna and communication module
Bucket satellite data and the difference information received from communication module, output obtains after calculus of differences
Framing signal.
Furthermore, described Differential positioning module includes radio-frequency signal processing module and fundamental frequency signal
Processing module, wherein:
Described radio-frequency signal processing module and antenna and the communication connection of fundamental frequency signal processing module, be used for
Send to fundamental frequency signal processing module after big-dipper satellite data from antenna are converted to intermediate-freuqncy signal；
Described fundamental frequency signal processing module and communication module communicate to connect, for will be from radiofrequency signal
The intermediate-freuqncy signal of reason module and the difference information from communication module export after carrying out pseudo range difference computing
Framing signal.
Furthermore, described Differential positioning module also includes:
Main power source module, electrically connects with radio-frequency signal processing module and fundamental frequency signal processing module；
Standby power supply module, electrically connects with radio-frequency signal processing module and fundamental frequency signal processing module,
And with main power source module communication connection to detect the duty of main power source module；
Charging circuit, is connected with standby power supply module, charges for standby power supply module.
Furthermore, described radio-frequency signal processing module is dual-mode radio frequency chip, for rough set theory
The GPS location data of radio frequency form and the big-dipper satellite data of radio frequency form from antenna；Corresponding
Ground, described fundamental frequency signal processing module is bimodulus baseband chip, for compatible processing at radiofrequency signal
The intermediate-freuqncy signal of reason module conversion gained.
Furthermore, described fundamental frequency signal processing module is provided with the switching command being connected with communication module
Input, processes the Big Dipper for receiving from communication module defend at single mode process GPS location data, single mode
Sing data and bimodulus process the switching command of switching between data.
Furthermore, described antenna is compatible receiver GPS location data and big-dipper satellite data
Dual-mode antenna.
Furthermore, described fundamental frequency signal processing module includes for exporting GPS location data or north
First outfan of bucket satellite data and for exporting after calculus of differences the second of gained framing signal
Outfan.
Furthermore, described Differential positioning module also includes the overcurrent protection module with antenna communication,
For detecting antenna condition and carrying out overcurrent protection under antenna short circuit state.
The utility model has the advantage of, utilize the communication between Differential positioning module and dipper system,
And utilize the differential data with ground to carry out Differential positioning, it is possible to increase the precision of ship location, accurately
Other to meter level.Radio-frequency signal processing module and fundamental frequency signal processing module in Differential positioning module are
Dual-mode chip, compatible processing GPS location data and big-dipper satellite data, it is possible to according to from upper
The order of machine switches between single mode and bimodulus, it is simple at the needs of location and the requirement of environment
Reason GPS location data, big-dipper satellite data one or both of which all process.Outside main power source
There is provided stand-by power supply, it is possible in the case of main power source breaks down, enable stand-by power supply, improve system
Stability；Outside framing signal after output calculus of differences, additionally it is possible to output radiofrequency signal demodulation
After fundamental frequency signal (the most original observed quantity) for reference, improve user use motility.
Accompanying drawing explanation
Fig. 1 is the AIS ship mounted terminal structural representation of one embodiment of this utility model；
Fig. 2 is the internal structure schematic diagram of the Differential positioning module of present example；
Fig. 3 is the structural representation of the bimodulus baseband chip of present example；
The AIS ship mounted terminal that Fig. 4 is present example carries out positioning used system structure schematic diagram.
Detailed description of the invention
For making this utility model of greater clarity, further solved in conjunction with drawings and Examples
Release explanation.
The AIS ship mounted terminal of present example is as it is shown in figure 1, include: Differential positioning module, antenna with
And communication module.The structural representation that AIS ship mounted terminal carries out positioning is with reference to Fig. 4, AIS ship mounted terminal
With Beidou satellite system communication, and by ground moving base station with through deployment Big Dipper ground strengthen system
System (CORS) and data center communicate, and obtain differential data from CORS, and from big-dipper satellite
System obtains big-dipper satellite data.
The Differential positioning module of present example is high-precision bimodulus Big Dipper Differential positioning module, such as figure
Shown in 2, bimodulus Big Dipper Differential positioning module support BD2B1/GPS L1 frequency, i.e. support process from
The GPS location data of antenna and big-dipper satellite data.It is integrated with radio frequency letter in Differential positioning inside modules
Number processing module and fundamental frequency signal processing module, in present example, due to Differential positioning module for
Holding GPS location data and big-dipper satellite data both of which, therefore, fundamental frequency signal processing module is certainly
The bimodulus baseband chip of BD2B1/GPS L1 frequency is supported in main research and development, and radio-frequency signal processing module is
The dual-mode radio frequency chip of a domestic configurable support BD2B1/GPS L1.
As shown in Figures 1 and 2, present example antenna receive overhead satellites GPS location data and
Big-dipper satellite data, in other implementations, can only receive big-dipper satellite data.Antenna will connect
The satellite-signal received is sent to dual-mode radio frequency chip, and dual-mode radio frequency chip internal is demodulated processing,
Demodulation includes the radio frequency form GPS location data received and big-dipper satellite data through LNA (low noise
Acoustic amplifier) amplify, deliver to intermediate-frequency filter after Frequency mixing processing, then by VGA (variable gain
Amplifier) and AGC (automatic growth control) after, then through analog digital conversion, by GPS location number
According to and big-dipper satellite data be converted into digital medium-frequency signal form and be sent to bimodulus baseband chip.Bimodulus base
Microarray strip receives the difference of digital medium-frequency signal that dual-mode radio frequency chip sends here and serial ports input and repaiies
Positive information, after the series of algorithms such as capture and tracking, positioning calculation process, is exported by serial ports
The data of NMEA form also provide 1PPS signal.
With reference to Fig. 3, bimodulus baseband chip is built-in with pseudo range difference algorithm, and is provided with the first output
End and the second outfan, wherein original observed quantity output supported by the first outfan, for height based on the Big Dipper
Precision Shipborne terminal product provide high sensitivity, low-power consumption, low cost BD2B1/GPS L1 poor
Divide dual-mode solution.As in figure 2 it is shown, Differential positioning module is designed with two groups of UART serial ports, respectively
For serial ports 1 (TXD1/RXD1) and serial ports 2 (TXD2/RXD2).Input (RXD1) in serial ports 1
Being responsible for receiving RTCM protocol data, the outfan (TXD1) in serial ports 1 is the first outfan simultaneously
The framing signal after calculus of differences or original observed quantity data, Qi Zhongjing is exported on UTC second border
The framing signal obtained after calculus of differences is NMEA data form.Host computer can also be by Fig. 1
Communication module send switching command to the serial ports 1 of Differential positioning module, Differential positioning module is carried out
Mode of operation switching, software upgrading etc. operate, thus the bimodulus baseband chip in Differential positioning module can
To carry out single mode GPS location data process (only processing GPS location data to be used for positioning), the single mode Big Dipper
Satellite data processes (only processing big-dipper satellite data to be used for positioning) and dual mode data processes (both
In conjunction with obtaining framing signal) switching.The baud rate scope of Differential positioning module support be 4800bps～
115200bps, default baud rate is 9600bps.Data form is: start bit 1, data bit 8,
Stop 1, position, no parity check position.The outfan (TXD2) of serial ports 2 is alternate serial port, gives tacit consent to the most defeated
Go out data.When being switched to original observed quantity output mode, and the original observed quantity of serial ports 1 synchronism output,
Default baud rate is 115200bps.Wherein the input (RXD2) of serial ports 2 also can receive output mould
Formula switching command and for software upgrading.
As it is shown on figure 3, bimodulus baseband chip have three power supply input pins (VCC, V_BCKP and
V_ANT) with a power supply output foot (VCC_RF).Wherein VCC connects Differential positioning module
Main power source module；V_BCKP is connected to the standby power supply module of module, and backup battery module detects
The state of main power source module, and power to RTC circuit when main power source VCC power-off, it is ensured that crucial letter
Breath is not lost, and to realize thermal starting function, poor location sub-module indoor design has standby power supply module
Charging circuit, it is recommended that external rechargeable battery or large bulk capacitance；It is defeated that V_ANT is that antenna is powered
Entering pin, inside modules is connected with RF_IN by inductance；VCC_RF exports VCC magnitude of voltage, can
Power for antenna.
The antennal interface (RF_IN pin) of Differential positioning module can be directly connected to the BD2 in antenna
B1/GPS L1 dual-mode antenna.Having antenna condition detection function in Differential positioning inside modules, acquiescence is every
Second reports the state of antenna by the TXT statement of NMEA, including normally connecting (OK), open circuit
(OPEN) and short circuit (SHORT) three kinds of states.When there is antenna short circuit, module can start
Self-protection function, it is to avoid produce excessive short circuit current；After antenna short-circuit conditions eliminates, module can
Automatically normal work is recovered.
This utility model uses boat-carrying high accuracy mobile satellite location equipment, uses the Big Dipper/GPS dual-mode difference skill
Art, receives Big Dipper ground and strengthens System level gray correlation divided data, thus be accurately positioned the dynamic position of ship.Difference
Divided data is through carrying out simultaneous observation on fixing survey station and flowing survey station, utilizes at fixing survey station
The one of the satellite fix of positioning result on upper measured satellite position error data correction flowing survey station
Technology.System, according to the known precision coordinate of base station, calculates the base station distance correction to satellite,
And in real time these data are sent by base station.Shipborne terminal is same be observed in high precision
Time, also receive the correction that base station sends, and its positioning result is corrected, thus improve
Positioning precision.Positioning precision all can reach the error of meter level, and error can be within 3 meters.Utilize this reality
With novel AIS ship mounted terminal, ship collision can be avoided, reduce human life and property loss, can be ship
Oceangoing ship provides the service such as waters traffic dynamic and traffic guide；Can realize boats and ships are navigated in terms of maritime administration
The static state of row and multidate information carry out continuous print supervision and management, promote and then transportation information chemical industry
Journey.
Claims (8)
1. one kind based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that including:
Antenna, receives big-dipper satellite data from big-dipper satellite；
Communication module, receives difference information for strengthening system from Big Dipper ground；
Differential positioning module, communicates to connect, according to the north received from antenna with antenna and communication module
Bucket satellite data and the difference information received from communication module, output obtains after calculus of differences
Framing signal.
2. as claimed in claim 1 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
State Differential positioning module and include radio-frequency signal processing module and fundamental frequency signal processing module, wherein:
Described radio-frequency signal processing module and antenna and the communication connection of fundamental frequency signal processing module, be used for
Send to fundamental frequency signal processing module after big-dipper satellite data from antenna are converted to intermediate-freuqncy signal；
Described fundamental frequency signal processing module and communication module communicate to connect, for will be from radiofrequency signal
The intermediate-freuqncy signal of reason module and the difference information from communication module export after carrying out pseudo range difference computing
Framing signal.
3. as claimed in claim 2 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
State Differential positioning module also to include:
Main power source module, electrically connects with radio-frequency signal processing module and fundamental frequency signal processing module；
Standby power supply module, electrically connects with radio-frequency signal processing module and fundamental frequency signal processing module,
And with main power source module communication connection to detect the duty of main power source module；
Charging circuit, is connected with standby power supply module, charges for standby power supply module.
4. as claimed in claim 2 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
Stating radio-frequency signal processing module is dual-mode radio frequency chip, for rough set theory from the radio frequency form of antenna
GPS location data and the big-dipper satellite data of radio frequency form；Accordingly, at described fundamental frequency signal
Reason module is bimodulus baseband chip, for compatible processing in radio-frequency signal processing module conversion gained
Frequently signal.
5. as claimed in claim 4 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
State fundamental frequency signal processing module and be provided with the switching command input being connected with communication module, for from communication
Module receives and processes GPS location data at single mode, single mode processes big-dipper satellite data and bimodulus processes
The switching command of switching between data.
6. as claimed in claim 2 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
Stating antenna is compatible receiver GPS location data and the dual-mode antenna of big-dipper satellite data.
7. as claimed in claim 6 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
State fundamental frequency signal processing module to include for exporting GPS location data or the first of big-dipper satellite data
Outfan and for exporting the second outfan of gained framing signal after calculus of differences.
8. as claimed in claim 6 based on the Big Dipper high-precision AIS ship mounted terminal, it is characterised in that institute
State Differential positioning module and also include the overcurrent protection module with antenna communication, be used for detecting antenna condition also
Overcurrent protection is carried out under antenna short circuit state.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788668A (en) * | 2016-11-22 | 2017-05-31 | 中船航海科技有限责任公司 | A kind of boat-carrying Big Dipper AIS combines reception system |
| CN106953762A (en) * | 2017-03-29 | 2017-07-14 | 千寻位置网络有限公司 | Differential service system and implementation method based on hot standby data center |
| CN107422344A (en) * | 2017-08-10 | 2017-12-01 | 广州中船文冲船坞有限公司 | Support the scientific investigation ship power positioning system structure of bathyscaph |
| CN108013868A (en) * | 2017-10-24 | 2018-05-11 | 武汉米风通信技术有限公司 | A kind of community monitor system based on the enhancing of Big Dipper ground and Internet of Things fusion |
| CN108562923A (en) * | 2018-04-16 | 2018-09-21 | 大连海事大学 | A kind of Multi-source Information Fusion ship's fix method based on AIS ship station |
| CN109283560A (en) * | 2018-09-26 | 2019-01-29 | 哈尔滨铁路科研所科技有限公司 | The positioning system and localization method of server end progress RTK resolving |
| CN111045041A (en) * | 2019-11-29 | 2020-04-21 | 交通运输部长江通信管理局 | Single-Beidou/multi-mode compatible working mode automatic switching method and device for satellite receiver |
| CN112433232A (en) * | 2020-12-15 | 2021-03-02 | 中电科（宁波）海洋电子研究院有限公司 | Search and rescue system and method based on Beidou high-precision positioning AIS terminal |
-
2016
- 2016-05-06 CN CN201620402449.5U patent/CN205574230U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788668A (en) * | 2016-11-22 | 2017-05-31 | 中船航海科技有限责任公司 | A kind of boat-carrying Big Dipper AIS combines reception system |
| CN106953762A (en) * | 2017-03-29 | 2017-07-14 | 千寻位置网络有限公司 | Differential service system and implementation method based on hot standby data center |
| CN106953762B (en) * | 2017-03-29 | 2019-01-29 | 千寻位置网络有限公司 | Differential service system and implementation method based on hot standby data center |
| CN107422344A (en) * | 2017-08-10 | 2017-12-01 | 广州中船文冲船坞有限公司 | Support the scientific investigation ship power positioning system structure of bathyscaph |
| CN107422344B (en) * | 2017-08-10 | 2023-04-14 | 广州文冲船舶修造有限公司 | Scientific investigation ship dynamic positioning system structure supporting deep diving device |
| CN108013868A (en) * | 2017-10-24 | 2018-05-11 | 武汉米风通信技术有限公司 | A kind of community monitor system based on the enhancing of Big Dipper ground and Internet of Things fusion |
| CN108562923A (en) * | 2018-04-16 | 2018-09-21 | 大连海事大学 | A kind of Multi-source Information Fusion ship's fix method based on AIS ship station |
| CN108562923B (en) * | 2018-04-16 | 2021-12-28 | 大连海事大学 | Multi-source information fusion ship positioning method based on AIS ship station |
| CN109283560A (en) * | 2018-09-26 | 2019-01-29 | 哈尔滨铁路科研所科技有限公司 | The positioning system and localization method of server end progress RTK resolving |
| CN111045041A (en) * | 2019-11-29 | 2020-04-21 | 交通运输部长江通信管理局 | Single-Beidou/multi-mode compatible working mode automatic switching method and device for satellite receiver |
| CN112433232A (en) * | 2020-12-15 | 2021-03-02 | 中电科（宁波）海洋电子研究院有限公司 | Search and rescue system and method based on Beidou high-precision positioning AIS terminal |
| CN112433232B (en) * | 2020-12-15 | 2022-08-26 | 中电科（宁波）海洋电子研究院有限公司 | Search and rescue system and method based on Beidou high-precision positioning AIS terminal |
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