CN110554618B - Communication system simulation method based on radar darkroom - Google Patents
Communication system simulation method based on radar darkroom Download PDFInfo
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Abstract
The invention relates to a simulation method of a communication system based on a radar darkroom, which comprises the steps that first communication equipment transmits a link connection normal signal to second communication equipment, if the link connection is normal, a test computer transmits test data to a terminal computer of a control subsystem, the test data is modulated into an analog signal by the second communication equipment, the signal is transmitted to an intermediate frequency module to be converted into an intermediate frequency signal, the intermediate frequency signal is transmitted to a simulator subsystem by a circulator, the simulator subsystem modulates the intermediate frequency signal according to a channel or interference parameter set by the terminal computer of the control subsystem, the intermediate frequency signal is converted into a transmission frequency band by up-conversion and then is transmitted to first communication equipment by a transmission antenna of an array subsystem, the first communication equipment transmits the received data to the terminal computer of the control subsystem through a network port, and the terminal computer can obtain the throughput under the set channel or interference parameter, and finishing the evaluation result of the link performance of the communication equipment in different channel and interference environments.
Description
Technical Field
The invention belongs to the technical field of radio frequency simulation of communication systems, and particularly relates to a method for performing semi-physical radio frequency simulation of a communication system in a radar darkroom.
Background
Semi-physical simulation is an experimental process which is carried out by combining a mathematical model with a physical model or a physical model, wherein the semi-physical simulation is realized on a computer after a simpler part in a system or a part which has a clearer rule and can establish an accurate mathematical model is established, and the semi-physical simulation is also called hardware-in-loop simulation because the physical model or the physical model is directly introduced into a simulation loop after the more complicated part or the part which has an unclear rule is established.
The semi-physical simulation is taken as a typical method for replacing a real environment or equipment, the advantages of physical and digital simulation are taken, the semi-physical simulation has the advantages of high confidence, effectiveness, repeatability, economy and safety, the semi-physical simulation is taken as an important and most promising simulation technology in the simulation field, advanced countries represented by the United states pay particular attention to the application of the semi-physical simulation, and almost all military troops build complete semi-physical simulation laboratories.
Along with the construction and use of radar guidance and radar confrontation semi-physical simulation laboratories, the types and functions of mathematical models for targets and electronic warfare are increasingly abundant, the simulation requirements of complex electromagnetic environments on the radio frequency capabilities of radar, communication and electronic warfare equipment are met, the capability of a radar semi-physical simulation system needs to be expanded, and the semi-physical radio frequency simulation of a communication system is carried out on the basis of a common radar radio frequency semi-physical simulation system.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a communication system semi-physical radio frequency simulation method based on a radar radio frequency simulation system. The method is suitable for semi-physical radio frequency simulation of the communication system link under different channel and interference environments.
Technical scheme
A communication system simulation method based on a radar darkroom is characterized by comprising the following steps:
step 1: a signal transmitted by first communication equipment is connected with a down-conversion module of second communication equipment through a receiving antenna, a frequency synthesis of the second communication equipment generates a local oscillation signal, the local oscillation signal is divided into two parts through a power divider and provides frequency conversion reference signals for down-conversion and up-conversion respectively, the second communication equipment receives the signal sent by the first communication equipment, the signal is down-converted and then output to an intermediate frequency module through a circulator, the signal is converted into a baseband signal and then transmitted to the baseband module for signal demodulation, a digital signal generated after demodulation is transmitted to a test computer, the test computer judges whether a link between the first communication equipment and the second communication equipment is normally connected or not according to the received digital signal, and if the link is normally connected, the step 3 is carried out;
step 2: the terminal computer realizes the control of the simulator subsystem through the network interface, sets up the channel or interference environment parameter needed for simulation, the simulator subsystem modulates the test data sent by the test computer according to the parameter, and simulates the channel or interference signal environment through the modulation transformation of the signal;
simulating a communication channel environment, comprising: the simulation transmission delay can be generated by a radar target distance in a radar radio frequency semi-physical simulation system, the delay value can be generated by setting a target distance value, and the transmission delay T can be described as:
wherein, T0Representing the processing delay of a subsystem of the simulator, d identifying the target distance, and c being the speed of light; simulating the intensity of the communication signal, wherein the intensity value can be realized by setting the output power value of the simulator, and in addition, along with the change of the movement distance between the communication devices, the power change satisfies the free space attenuation, and then the power attenuation P can be described as:
P＝P0-20·log D/Do (2)
wherein, P0For the simulator output power, D is the distance of movement, DoThe distance between the first microwave darkroom communication equipment and the receiving antenna of the array subsystem; simulating Doppler frequency shift of communication equipment caused by relative motion, wherein the frequency shift value can be set by setting the motion speed of a simulator target, and the Doppler frequency shift fdCan be described as:
wherein f is a communication signal carrier frequency, c is a light velocity, and v is a target relative movement velocity set by the simulator; simulating a plurality of communication link signals, wherein the multipath effect can be set through radar target scattering points in a radar radio frequency semi-physical simulation system, each scattering point is represented by three parameters of a relative RCS value, a relative distance and a relative speed, and respectively describes the power, the distance and the speed of the scattering point relative to a target, the power of a path signal can be described by setting the RCS value, similarly, the time delay and the Doppler frequency offset of the path can be calculated and set according to the formula (1) and the formula (3), and further, the power and the time delay can be set according to Rayleigh distribution characteristics to complete Rayleigh channel characteristic simulation;
the simulation communication interference environment can provide broadband noise, narrow-band noise, sweep frequency interference and comb spectrum interference for the simulation of communication interference in a radar darkroom radio frequency semi-physical simulation system; the method comprises the steps that broadband white noise interference with the bandwidth unit of 100-500M is provided by broadband noise, a broadband noise interference environment is formed by setting a center frequency, a bandwidth and a power and a noise bandwidth, narrowband noise interference with the bandwidth unit of 2-5 MHz is provided by the narrowband noise, the narrowband noise interference environment is formed by setting the center frequency, the bandwidth and the power and the noise bandwidth, typical signal interference is provided by sweep frequency interference, a sweep frequency interference environment is formed by setting the center frequency, the bandwidth and the power, sawtooth waves, triangular waves and sine wave function types, dense interference signals in the bandwidth of 100M are provided by comb spectrum interference, and a comb spectrum interference environment is formed by setting the center frequency, the bandwidth, the power and the spectrum density;
and step 3: test data sent by the test computer is modulated into an analog signal through a baseband module of the second communication equipment, the signal is transmitted to an intermediate frequency module to be converted into an intermediate frequency signal, and then the intermediate frequency signal is transmitted to a simulator subsystem through a circulator, the simulator subsystem modulates the intermediate frequency signal according to a channel or interference parameter set by a terminal computer of the control subsystem, the intermediate frequency signal is converted into a transmitting frequency band through up-conversion and then is sent to first communication equipment through an array subsystem transmitting antenna, and the first communication equipment forwards the received data to the terminal computer of the control subsystem through a network port;
and 4, step 4: and the terminal computer acquires the throughput of the communication link between the first communication equipment and the second communication equipment under different channel or interference conditions according to the received data volume and the set channel or interference environment setting, and completes the semi-physical simulation of the communication link of the communication equipment.
Advantageous effects
The communication system simulation method based on the radar darkroom has the following beneficial effects:
1) on the basis of a radar darkroom radio frequency semi-physical simulation system, a communication system semi-physical radio frequency simulation method is provided, communication system simulation equipment is not added, and simulation cost is reduced;
2) the method has the advantages that channel simulation and interference simulation are achieved, the radio frequency simulation capability of the radar is fully utilized, extra software algorithm work is not added, and the method is simple and effective to achieve.
Drawings
FIG. 1 is a block diagram of a simulation implementation of the communication system of the present invention
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
and the semi-physical radio frequency simulation of the communication system link under different channel and interference environments is completed by constructing a semi-physical radio frequency simulation platform of the communication system. The platform comprises a first communication device and a second communication device to be tested, a control subsystem, an array subsystem and a simulator subsystem of the semi-physical simulation system, a power divider, an up-converter and a circulator which are used for connecting the communication device to be tested and the semi-physical simulation system, and a test computer which is used for assisting the test, wherein a transmitting signal of the first communication device is connected with a down-conversion module of the second communication device through a receiving antenna of the array subsystem, a frequency synthesizer of the second communication device generates a local oscillator signal, the local oscillator signal is divided into two parts through the power divider, frequency conversion reference signals are respectively provided for down-conversion and up-conversion, the signal sent by the first communication device is down-converted by the second communication device and then output to an intermediate frequency module through the circulator, the signal is converted into a baseband signal and then transmitted to the baseband module for signal demodulation, a digital signal generated after the demodulation is transmitted to the test computer, and the test computer is connected with the second communication device through a network port, the computer is provided with link detection software matched with the tested communication equipment, whether the link connection between the first communication equipment and the second communication equipment is normal is judged through a received digital signal, after the link connection is normal, the test computer sends test data to a terminal computer of the control subsystem, the test data is modulated into an analog signal through a baseband module of the second communication equipment, the analog signal is transmitted to an intermediate frequency module to be converted into an intermediate frequency signal, the intermediate frequency signal is transmitted to the simulator subsystem through a circulator, the simulator subsystem modulates the intermediate frequency signal according to a channel or interference parameter set by the terminal computer of the control subsystem, the intermediate frequency signal is converted into a transmitting frequency band through up-conversion and then is sent to the first communication equipment through a transmitting antenna of the array subsystem, the first communication equipment forwards the received data to the terminal computer of the control subsystem through a network port, and the terminal computer can obtain the throughput under the set channel or interference parameter, the evaluation result of the link performance of the communication equipment under different channel and interference environments can be completed. A block diagram of a semi-physical rf simulation implementation of a communication system is shown in fig. 1.
The method comprises the following specific steps:
1) and the first communication equipment and the second communication equipment to be tested are connected into a semi-physical simulation system to form a semi-physical radio frequency simulation platform of the communication system, the first communication equipment is connected with a terminal computer of the control subsystem, and the second communication equipment is connected with the array subsystem, the simulator subsystem and the test computer. After the simulation platform is powered on, the first communication equipment automatically sends a link establishment signal to the second communication equipment, the second communication equipment forwards the received signal to the test computer, the test computer judges whether the link function between the first communication equipment and the second communication equipment is normal or not according to the received signal, and under the condition that the link function is normal, the test computer sends test data to the terminal computer of the control subsystem through the second communication equipment and the first communication equipment.
2) Test data sent by the test computer is transmitted to the first communication device through the array subsystem transmitting antenna after passing through the second communication device, the circulator, the simulator subsystem and the up-conversion, and then is forwarded to the terminal computer of the control subsystem through the network interface of the first communication device.
Simulating a communication channel environment, comprising: transmission delay, power attenuation, doppler shift, and multipath transmission. The simulation transmission delay can be generated through a radar target distance in a radar radio frequency semi-physical simulation system, a delay value can be generated by setting a target distance value, and the transmission delay T can be described as follows:
wherein T is0Representing the processing delay of the simulator subsystem, d identifying the target distance, and c the speed of light. Simulating the intensity of the communication signal, wherein the intensity value can be realized by setting the output power value of the simulator, and in addition, along with the change of the movement distance between the communication devices, the power change satisfies the free space attenuation, and then the power attenuation P can be described as:
P＝P0-20·log D/Do (2)
wherein P is0For the simulator output power, D is the distance of movement, D0The distance between the first communication equipment of the microwave darkroom and the receiving antenna of the array subsystem. Simulating Doppler frequency shift of communication equipment caused by relative motion, wherein the frequency shift value can be set by setting the motion speed of a simulator target, and the Doppler frequency shift fdCan be described as:
wherein f is the carrier frequency of the communication signal, c is the speed of light, and v is the relative movement speed of the target set by the simulator. The method includes the steps that a plurality of communication link signals are simulated, the multipath effect can be set through radar target scattering points in a radar radio frequency semi-physical simulation system, each scattering point is represented by three parameters of a relative RCS value, a relative distance and a relative speed and respectively describes the power, the distance and the speed of the scattering point relative to a target, the power of a path signal can be described through setting the RCS value, similarly, the time delay and the Doppler frequency offset of the path can be calculated and set according to the formula (1) and the formula (3), further, the power and the time delay can be set according to Rayleigh distribution characteristics, and Rayleigh channel characteristic simulation is completed.
The simulation communication interference environment, in the radar darkroom radio frequency semi-physical simulation system, can provide broadband noise, narrow-band noise, sweep frequency interference, comb spectrum interference for the simulation of communication interference. The method comprises the steps that broadband white noise interference with the bandwidth unit of 100-500M is provided by broadband noise, a broadband noise interference environment is formed by setting a center frequency, a bandwidth and a power and a noise bandwidth, narrowband noise interference with the bandwidth unit of 2-5 MHz is provided by the narrowband noise, the narrowband noise interference environment is formed by setting the center frequency, the bandwidth, the power and the noise bandwidth, typical signal interference is provided by frequency sweep interference, a frequency sweep interference environment is formed by setting the center frequency, the bandwidth, the power, a sawtooth wave, a triangular wave and a sine wave function type, dense interference signals in the bandwidth of 100M are provided by comb spectrum interference, and a comb spectrum interference environment is formed by setting the center frequency, the bandwidth, the power and the spectrum density.
3) And the terminal computer of the control subsystem acquires the test data sent by the test computer, and according to the received data volume and the set channel or interference environment setting, the terminal computer can acquire the throughput of the communication link between the second communication equipment and the first communication equipment under different channel or interference conditions to complete the semi-physical simulation of the communication link of the communication equipment.
Referring to fig. 1, it is a block diagram of the simulation implementation of the communication system of the present invention, and the implementation process is as follows:
step one, a semi-physical radio frequency simulation platform of a communication system is built in a radar darkroom, and the connection between the semi-physical simulation system and communication equipment is completed; secondly, ensuring that a link between the first communication equipment and the second communication equipment works normally, after the tested communication equipment is powered on, automatically sending a link establishment signal to the second communication equipment by the first communication equipment, and receiving the connection signal by the test computer to judge that the link works normally; thirdly, controlling a subsystem terminal computer to perform parameter configuration on the simulator subsystem according to simulation requirements to complete simulation of a communication channel or an interference environment; and fourthly, the test computer sends test data to a terminal computer of the control subsystem through the second communication equipment, the circulator, the simulator subsystem, the transmitting antenna of the up-conversion array subsystem and the first communication equipment, and the terminal computer receives the test data, acquires the throughput under the set channel or interference environment and completes the semi-physical simulation of the communication link of the communication equipment.
Wherein, in the first step, a semi-physical simulation platform of the communication system is set up, and the specific method comprises the following steps:
the semi-physical simulation platform of the communication system comprises a first communication device and a second communication device to be tested, a control subsystem, an array subsystem and a simulator subsystem of the semi-physical simulation system, a power divider, an up-converter and a circulator which are used for connecting the communication device to be tested and the semi-physical simulation system, and a test computer which is used for assisting simulation. The first communication device is connected to a terminal computer of the control subsystem via a network interface and, in the second communication device, the frequency comprehensive signal is connected to a power divider, the output of the power divider provides frequency conversion reference signals for down-conversion and up-conversion respectively, a down-conversion module is connected with a receiving antenna of the array subsystem to receive the signals, a circulator is arranged between a down-conversion module and an intermediate-frequency module to ensure that a received signal is transmitted to the intermediate-frequency module and a baseband module without interference, the baseband module is connected with a test computer through a network interface to receive and transmit data, an output signal of the intermediate-frequency module is transmitted to a simulator subsystem through the circulator to ensure that test data sent by the test computer is directly transmitted to the simulator subsystem through the baseband and the intermediate-frequency module, the simulator subsystem is connected with an up-conversion module, and the up-conversion module is connected with a transmitting antenna of an array subsystem to finish wireless transmission of the test data.
The third step simulates communication channel and interference environment, which includes the following steps:
1) the terminal computer sets the simulation parameters of the simulator subsystem to simulate the communication channel. The communication channel environment simulation comprises: time delay, power attenuation, doppler shift, and multipath transmission, the functional description of which is illustrated in table 1.
TABLE 1 simulated communication channel Environment
The method comprises the steps of simulating communication transmission delay, generating a delay value by setting a target distance value, simulating communication signal strength, and setting a strength value by setting an output power value of a simulator, simulating Doppler frequency shift generated by relative motion of communication equipment, setting a frequency shift value by setting a target motion speed of the simulator, simulating multipath effect, and setting scattering points of a radar target, wherein each scattering point is represented by three parameters, namely a relative radar scattering sectional area value, a relative distance and a relative speed, and respectively describes the power, the distance and the speed of the radar relative to the target, the power of a path signal is described by setting the radar scattering sectional area, and the communication transmission delay and the Doppler frequency shift are set by setting the transmission delay and the Doppler frequency shift.
2) The terminal computer sets simulation parameters of a simulator subsystem to simulate a communication interference environment, typical communication interference environment simulation comprises broadband noise, narrow-band noise, sweep frequency interference and comb spectrum interference, and the function description is shown in table 2.
TABLE 2 simulated communications interference environments
The broadband noise is realized by setting the center frequency, the bandwidth, the power and the noise bandwidth of a broadband noise signal of a darkroom radar radio frequency simulation system, the narrowband noise is realized by setting the center frequency, the bandwidth, the power and the noise bandwidth of a narrowband noise signal of the darkroom radar radio frequency simulation system, the sweep frequency interference is realized by setting the sawtooth wave, the triangular wave and the sine wave interference pattern and the center frequency, the bandwidth and the power of a sweep frequency interference signal of the darkroom radar radio frequency simulation system, and the dressing spectrum interference is realized by setting the center frequency, the bandwidth, the power and the spectrum density of a dressing spectrum interference signal of the darkroom radar radio frequency simulation system.
Claims (1)
1. A communication system simulation method based on a radar darkroom is characterized by comprising the following steps:
step 1: a signal transmitted by first communication equipment is connected with a down-conversion module of second communication equipment through a receiving antenna, a frequency synthesis of the second communication equipment generates a local oscillation signal, the local oscillation signal is divided into two parts through a power divider and provides frequency conversion reference signals for down-conversion and up-conversion respectively, the second communication equipment receives the signal sent by the first communication equipment, the signal is down-converted and then output to an intermediate frequency module through a circulator, the signal is converted into a baseband signal and then transmitted to the baseband module for signal demodulation, a digital signal generated after demodulation is transmitted to a test computer, the test computer judges whether a link between the first communication equipment and the second communication equipment is normally connected or not according to the received digital signal, and if the link is normally connected, the step 3 is carried out;
step 2: the terminal computer realizes the control of the simulator subsystem through the network interface, sets up the channel or interference environment parameter needed for simulation, the simulator subsystem modulates the test data sent by the test computer according to the parameter, and simulates the communication channel environment or the communication interference environment through the modulation conversion of the signal;
simulating a communication channel environment, comprising: the simulation transmission delay can be generated by a radar target distance in a radar radio frequency semi-physical simulation system, the delay value can be generated by setting a target distance value, and the transmission delay T can be described as:
wherein, T0Representing the processing delay of a subsystem of the simulator, d identifying the target distance, and c being the speed of light; simulating communication signal strength, the strength value can be set by setting the moduleThe output power value of the simulator is realized, and in addition, along with the change of the movement distance between the communication devices, the power change satisfies the free space attenuation, and then the power attenuation P can be described as:
P＝P0-20·log D/Do (2)
wherein, P0For the simulator output power, D is the movement distance, DoThe distance from the first microwave darkroom communication equipment to the receiving antenna of the array subsystem; simulating Doppler frequency shift of communication equipment caused by relative motion, wherein the frequency shift value can be set by setting the motion speed of a simulator target, and the Doppler frequency shift fdCan be described as:
wherein f is a communication signal carrier frequency, c is a light velocity, and v is a target relative movement velocity set by the simulator; simulating a plurality of communication link signals, wherein the multipath effect can be set through radar target scattering points in a radar radio frequency semi-physical simulation system, each scattering point is represented by three parameters of a relative RCS value, a relative distance and a relative speed, and respectively describes the power, the distance and the speed of the corresponding target, the power of the communication link signals can be described by setting the RCS value, similarly, the time delay and the Doppler frequency offset of the communication link can be calculated and set according to the formula (1) and the formula (3), and further, the power and the time delay can be set according to Rayleigh distribution characteristics to complete Rayleigh channel characteristic simulation;
the simulation communication interference environment can provide broadband noise, narrow-band noise, sweep frequency interference and comb spectrum interference for the simulation of communication interference in a radar darkroom radio frequency semi-physical simulation system; the broadband noise provides broadband white noise interference with the bandwidth unit of 100-500M, a broadband noise interference environment is formed by setting central frequency, bandwidth, power and noise bandwidth, the narrowband noise provides narrowband white noise interference with the bandwidth unit of 2-5 MHz, the narrowband noise interference environment is formed by setting the central frequency, bandwidth, power and noise bandwidth, the sweep frequency interference provides typical signal interference, the sweep frequency interference environment is formed by setting the central frequency, bandwidth, power, sawtooth wave, triangle wave and sine wave function types, the comb spectrum interference provides dense interference signals in the bandwidth of 100M, and the comb spectrum interference environment is formed by setting the central frequency, bandwidth, power and spectrum density;
and step 3: test data sent by the test computer is modulated into an analog signal through a baseband module of the second communication equipment, the signal is transmitted to an intermediate frequency module to be converted into an intermediate frequency signal, and then the intermediate frequency signal is transmitted to a simulator subsystem through a circulator, the simulator subsystem modulates the intermediate frequency signal according to a channel or interference parameter set by a terminal computer of the control subsystem, the intermediate frequency signal is converted into a transmitting frequency band through up-conversion and then is sent to first communication equipment through an array subsystem transmitting antenna, and the first communication equipment forwards the received data to the terminal computer of the control subsystem through a network port;
and 4, step 4: and the terminal computer acquires the throughput of the communication link between the first communication equipment and the second communication equipment under different channel or interference conditions according to the received data volume and the set channel or interference environment setting, and completes the semi-physical simulation of the communication link of the communication equipment.
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