CN116500563A - Semi-physical simulation system of airborne monopulse radar - Google Patents
Semi-physical simulation system of airborne monopulse radar Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a semi-physical simulation system of an airborne monopulse radar, which mainly solves the problem that the prior art cannot perform full-flow simulation on signal processing from the front end to the rear end of an antenna of the airborne monopulse radar. It comprises the following steps: echo simulation module, receiving module and signal processing module. The echo simulation module simulates and generates radio frequency echo signals of a sum channel, a pitching difference channel and a azimuth difference channel of the monopulse radar when the carrier flies; the receiving module performs down-conversion on the three paths of radio frequency echo signals to obtain three paths of intermediate frequency signals; the signal processing module samples and processes the three paths of intermediate frequency signals and outputs the detection target distance, speed, pitch angle and azimuth angle of the carrier. The invention designs the airborne monopulse radar simulation system by combining software and hardware, has short development period, low cost and high repeated use rate, can realize the full-flow simulation of the signal processing of the airborne monopulse radar from the front end to the rear end of the antenna, and can be used for the design and function verification of the airborne monopulse radar.
Description
Technical Field
The invention belongs to the technical field of radars, and particularly relates to a semi-physical simulation system which can be used for designing and functional verification of an airborne monopulse radar.
Background
In the development and production process of radar, radar performance and indexes need to be tested. The traditional testing method relies on the outfield test, namely, a real target is used for providing echo signals for the radar, so that a great deal of manpower, material resources and financial resources are consumed, and the development period is prolonged. And more particularly to on-board products, verification of functional performance through pilot tests is required. The radar performance index test is carried out through the outfield test, so that the development period is long and the development cost is high.
The simulation technology combining software and hardware can simulate the target and provide echo signals for the airborne monopulse radar by using the scene. The radar semi-physical simulation system can shorten the radar development period and reduce the radar development cost, and has the advantages of economy, flexibility and reusability. In the development stage, the simulation system can demonstrate various indexes of the radar and simulate problems encountered in actual use of the radar. During the production delivery phase, an evaluation means may also be provided for the system performance of the detection radar.
The radar echo signals of the radar in different postures, different heights and different speeds of the carrier can be simulated through simulation, so that the design verification of radar waveforms, the design verification of antenna patterns and the verification of a radar signal processing algorithm are performed.
Patent document with application number of CN107436755A discloses a modeling method and system of radar simulation system, which mainly aims to provide a modeling method of radar simulation system, and simulate and reproduce working mechanism and process of radar in different scenes on a computer. The system belongs to software level simulation, can carry out theoretical level simulation verification in a radar design stage, but also needs to test hardware indexes of a radar subsystem and external hardware interface relations in an actual test and production stage of a radar, so that the pure software simulation system cannot be used in the test and production delivery stage of the radar, and causes the limitation of application of the pure software simulation system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an airborne monopulse radar semi-physical simulation system for verifying and evaluating the overall functional performance of an airborne monopulse radar, and meeting the use requirements of a radar complete machine design stage, a test stage and a production delivery stage.
The technical scheme for achieving the aim of the invention comprises the following steps.
1. The semi-physical simulation system of the airborne monopulse radar is characterized by comprising a simulation module 1, a receiving module 2 and a signal processing module 3, wherein the receiving module 2 is connected with the monopulse radar echo simulation module 1 and the signal processing module 3 in a unidirectional manner;
the echo simulation module 1 comprises a baseband echo submodule 11 and an echo simulation submodule 12, wherein the baseband echo submodule is used for generating a baseband echo signal with target characteristics and the flying gesture of the carrier, and the echo simulation submodule is used for up-converting the baseband echo signal and transmitting the up-converted radio frequency signal to the receiving module 2;
the receiving module 2 is configured to transmit the intermediate frequency signal after the down-conversion of the radio frequency signal to the signal processing module 3; it includes a sum channel 21, a pitch difference channel 22, a azimuth difference channel 23, a control submodule 24, a frequency source 25 and a power supply submodule 26; the three channels are provided with numerical control attenuators, and attenuation of the attenuators is controlled by a control submodule; the frequency source generates high local oscillation signals, low local oscillation signals, synchronous signals of the echo simulation module and clock signals of the signal processing module, which are needed by down-conversion of three channels;
the signal processing module 3 comprises an ADC sub-module 31, a signal processing sub-module 32, a storage sub-module 33 and a power supply sub-module 34, wherein the ADC sub-module samples the intermediate frequency signal and transmits the sampled signal to the signal processing sub-module; the signal processing sub-module performs signal processing on the sampling signal; the storage sub-module is used for storing data of the signal processing sub-module and loading a chip program.
Further, the baseband echo submodule 11 includes a parameter setting unit 111, a transmitting unit 112, an antenna unit 113, a target RCS unit 114, a clutter signal unit 115, and a baseband echo generating unit 116;
the parameter setting unit 111 is configured to set basic parameters of the carrier, including information such as flight height, triaxial speed and attitude information of the carrier, and transmit the information to the baseband echo generating unit;
the transmitting unit 112 is configured to configure a frequency, a power, a pulse width, a pulse period and a modulation mode of a transmitting signal, and transmit the configured frequency, power, pulse width, pulse period and modulation mode to the baseband echo generating unit;
the antenna unit 113 is configured to generate an antenna pattern of the sum channel, the azimuth difference channel, and the elevation difference channel, and transmit the antenna pattern to the baseband echo generating unit;
the target RCS unit 114 is configured to set a target number and RCS characteristics, and transmit the target number and RCS characteristics to the baseband echo generating unit;
the clutter signal unit 115 is configured to set a clutter signal model and clutter power, and transmit the clutter signal model and clutter power to the baseband echo generating unit;
the baseband echo generating unit 116 is configured to generate baseband echo data of the sum channel, the azimuth difference channel, and the elevation difference channel.
Further, the echo simulation sub-module 12 includes a signal storage unit 121, an analog signal generation unit 122, and an up-conversion unit 123;
the signal storage unit 121 is configured to store the generated baseband echo data;
the analog signal generating unit 122 is configured to convert the stored baseband echo data into an analog signal and output the analog signal to the up-conversion unit;
the up-conversion unit 123 is configured to up-convert the generated analog signal to a radio frequency band.
Further, the control submodule 24 includes a communication unit 241 and a control unit 242;
the communication unit 241 is configured to receive control information from the signal processing module, and transmit the received information to the control unit;
the control unit 242 is configured to transmit control signals to the digitally controlled attenuators of the three channels.
Further, the ADC sub-module 31 includes a sum channel unit 311, a azimuth difference channel unit 312, and a pitch difference channel unit 313;
the sum channel unit 311 is configured to perform ADC sampling on the sum channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module;
the pitch difference channel unit 312 is configured to perform ADC sampling on the pitch difference channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module;
the azimuth difference channel unit 313 is configured to perform ADC sampling on the azimuth difference channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module.
Further, the signal processing sub-module 32 includes a signal processing unit 321, a data processing unit 322, and a communication unit 323;
the signal processing unit 321 is configured to implement a radar signal processing correlation algorithm, and transmit the processed data to the data processing unit;
the data processing unit 322 is configured to implement a radar data processing correlation algorithm;
the communication unit 323 is configured to communicate with the receiving module and output a simulation result of the system.
2. The method for simulating the airborne monopulse radar by using the system is characterized by comprising the following steps of:
setting initial parameters in a baseband echo submodule 11 of the radar echo simulation module 1, and simulating three baseband echo data of a sum channel, a pitching difference channel and a azimuth difference channel of the monopulse radar when the carrier flies;
transmitting the three paths of baseband echo data to the echo simulation sub-module 12 to generate a radio frequency echo signal, and outputting the radio frequency echo signal to the receiving module 2;
the receiving module 2 performs down-conversion processing on the three paths of radio frequency echo signals to obtain three paths of intermediate frequency signals, and transmits the three paths of intermediate frequency signals to the signal processing module 3;
the signal processing module 3 sequentially samples and processes three paths of intermediate frequency signals through the ADC submodule 31 and the signal processing submodule 32, outputs the detection target distance, speed, pitch angle and azimuth angle of the carrier, and realizes the full-flow simulation of the signal processing of the airborne monopulse radar from the front end to the rear end of the antenna.
Compared with the prior art, the invention has the following advantages:
firstly, different functions can be completed due to the fact that different functional units are arranged in the echo simulation module 1, namely, flight height, speed and attitude information of the carrier and flight conditions of the carrier are simulated through the parameter setting unit 111; simulation verification of the radar transmitter is performed by the transmitting unit 112; simulation verification of the radar antenna pattern is performed by the antenna unit 113; simulating the RCS characteristics and number of targets by the target RCS unit 114; the design verification workload of the radar transmitter and the antenna is reduced, the development period is shortened, and the time and cost of the test flight test and the outfield test are reduced by simulating the flight condition and the detection target condition of the carrier.
Secondly, the invention sets the receiving module 2 to down-convert the three-path radio frequency echo signal generated by the echo simulation module 1 to the intermediate frequency band, and then transmits the signal to the signal processing module 3 for processing, thus realizing the processing flow of the radar receiver through a hardware circuit, being capable of simulating the radar receiver system so as to assist in completing the test work of the antenna and the transmitter in the production stage and reducing the test cost;
thirdly, the invention processes the received three paths of intermediate frequency signals through the signal processing module 3, so that the algorithm verification and hardware design evaluation work of the radar signal processing platform can be completed, and the test work of the receiver can be assisted in the production stage.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of an echo simulation module according to the present invention;
FIG. 3 is a schematic diagram of a receiving module in accordance with the present invention;
FIG. 4 is a schematic diagram of a signal processing module according to the present invention;
FIG. 5 is a simulation flow chart of the present invention;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention includes a monopulse radar echo simulation module 1, a reception module 2, and a signal processing module 3. Wherein, the receiving module 2 is connected with the echo simulation module 1 and the signal processing module 3 in a unidirectional way respectively. The echo simulation module 1 is used for generating a three-channel radio-frequency echo signal with the carrier frequency of 16.5GHz and three channels of channel sum, azimuth difference and elevation difference, and transmitting the three-channel radio-frequency echo signal to the receiving module 2; the receiving module 2 respectively carries out secondary down-conversion treatment on three channel signals, namely a sum channel, a pitch channel and a azimuth channel, so as to down-convert the radio frequency echo to an intermediate frequency band; and then the target distance, speed, pitch angle, azimuth angle and AGC control information are obtained by sending the target distance, speed, pitch angle, azimuth angle and AGC control information to the signal processing module 3 for ADC sampling and signal processing.
Referring to fig. 2, the echo simulation module 1 includes a baseband echo sub-module 11 and an echo simulation sub-module 12. The baseband echo submodule 11 includes a parameter setting unit 111, a transmitting unit 112, an antenna unit 113, a target RCS unit 114, a clutter signal unit 115, and a baseband echo generating unit 116; the echo simulation sub-module 12 includes a signal storage unit 121, an analog signal generation unit 122, and an up-conversion unit 123.
The parameter setting unit 111 is configured to set basic parameters of the carrier, including flight altitude, triaxial speed and attitude information of the carrier, and transmit the parameter information to the baseband echo generating unit 116;
the transmitting unit 112 is configured to configure a frequency, a power, a pulse width, a pulse period and a modulation mode of a transmitting signal, and transmit parameter information to the baseband echo generating unit 116;
the antenna unit 113 is configured to generate an antenna pattern of a sum channel, a azimuth difference channel, and a pitch difference channel, and transmit parameter information to the baseband echo generating unit 116;
the target RCS unit 114 is configured to set a target number and RCS characteristics, and transmit parameter information to the baseband echo generating unit 116;
the clutter signal unit 115 is configured to set a clutter signal model and clutter power, and transmit parameter information to the baseband echo generating unit 116;
the baseband echo generating unit 116 is configured to generate baseband echo data of the sum channel, the azimuth difference channel, and the elevation difference channel.
The signal storage unit 121 is configured to store the generated baseband echo signal data;
the analog signal generating unit 122 is configured to convert the stored baseband echo data into an analog signal and output the analog signal to the up-conversion unit 123;
the up-conversion unit 123 is configured to up-convert the generated analog signal to a radio frequency band.
The units and modules of the echo simulation module 1 in this example are set, but not limited to, the following parameters:
the parameter setting unit 111 sets the flying height of the carrier to 500m, the X-axis speed to 20km/h, the Y-axis speed and the Z-axis speed to 0km/h, the pitch attitude angle of the carrier to 0 degrees, and the roll attitude angle to 0 degrees;
the frequency of the transmission signal in the transmission unit 112 is set to 16.5GHz, the transmission power is 150W, the pulse width is 10us, and the pulse period is 100us;
the antenna unit 113 sets four antenna beams, the gain is 25dB, the beam width is 5 °, the deviation angle between the beams is 2 °, and the sum antenna pattern, the azimuth difference antenna pattern and the elevation difference antenna pattern of the radar are generated by using the four antenna beams;
the targets in the target RCS unit 114 are set as cars, 1 in number, and the RCS is 100m 2 ；
The clutter signal model in the clutter signal unit 115 is set to rayleigh;
the baseband echo generation unit 116 generates baseband echo data of the sum channel, the azimuth difference channel, and the elevation difference channel according to the above-described setting parameters.
The signal storage unit 121 is implemented by a high-capacity DDR chip, the analog signal generating unit 122 is implemented by an FPGA and a DAC chip, reads baseband echo signal data in the signal storage unit, converts the baseband echo signal data into an analog signal, outputs the analog signal to the up-conversion unit 123, up-converts the analog signal to 16.5GHz in the up-conversion unit 123, and outputs the analog signal through 3 SMA radio frequency interfaces.
Referring to fig. 3, the receiving module 2 includes a sum channel 21, a pitch difference channel 22, a azimuth difference channel 23, a control submodule 24, a frequency source 25, and a power supply submodule 26; wherein the control sub-module 24 comprises a communication unit 241 and a control unit 242;
the sum channel 21, the pitch difference channel 22 and the azimuth difference channel 23 are used for down-converting the radio frequency echo signal to an intermediate frequency band: after entering the three channels, the radio frequency echo signal passes through a Low Noise Amplifier (LNA) and a filter: performing first down-conversion through a mixer and a high local oscillator signal; amplifying the signal by an amplifier, and performing second down-conversion by a mixer and a low local oscillator signal; after passing through the filter and the digital control attenuator, amplifying and filtering by the amplifier and outputting intermediate frequency signals of three channels;
the frequency source 25 is used for generating high local oscillation signals and low local oscillation signals which are needed by down-conversion of three channels, synchronizing signals of the echo simulation module 1 and clock signals of the signal processing module 3;
the communication unit 241 is configured to receive control information from the signal processing module 3, and transmit the received information to the control unit 242;
the control unit 242 is used to transmit control signals to the three-channel digitally controlled attenuator.
In this example, the receiving module 2 is provided with 8 signal interfaces and 1 control interface; the 3 radio frequency signal SMA input ports are used for receiving three channel radio frequency echo signals generated by the echo simulation module; the module is provided with 5 signal output interfaces, wherein the signal output interfaces comprise 3 intermediate frequency signal SMA output interfaces, 1 clock signal SMA output interface and 1 synchronous signal SMA output interface; the control interface is a 15-core micro rectangular socket and is connected to the signal processing module 3;
the sum channel 21, the pitching difference channel 22 and the azimuth difference channel 23 carry out first down-conversion processing on radio frequency signals through a low noise amplifier LNA and a filter, and then carry out frequency mixing through a mixer and a 1.6GHz high local oscillator signal, and down-convert 16.5GHz + -fd signals into 1.6GHz + -fd signals; then through an amplifier, a mixer and a 150MHz low local oscillator signal are mixed to perform a second down-conversion treatment, and a 1.6GHz + -fd signal is converted into 150MHz + -fd; then the signals are output to the signal processing module 3 after passing through a filter and a digital control attenuator and then passing through an amplifier and the filter;
the communication unit 241 of the control sub-module 24 adopts an RS422 interface chip to perform communication, receives the AGC control signal transmitted by the signal processing module 3, and transmits the AGC control signal to the control unit 242; the control unit 242 adopts an FPGA chip to calculate the control signal and sends the control signal to the numerical control attenuators in the three channels; the control sub-module 24 is connected with the signal processing module 3 through a control interface, and the communication mode is an RS422 serial port;
the frequency source 25 provides stable high local oscillation signals and low local oscillation signals for the three channels, and simultaneously outputs synchronous signals and clock signals; the frequency of the high local oscillation signal is 1.6GHz, the frequency of the low local oscillation signal is 150MHz, the generated synchronous signal is 10MHz, the synchronous signal is output to the echo simulation module 1, the frequency of the generated clock signal is 120MHz, and the synchronous signal is output to the signal processing module 3;
the power supply sub-module 26 converts the 220V ac voltage to a ± 12V dc voltage for which the module is suitable.
Referring to fig. 4, the signal processing module 3 includes an ADC sub-module 31, a signal processing sub-module 32, a storage sub-module 33, and a power supply sub-module 34. Wherein the ADC sub-module 31 includes a sum channel unit 311, a pitch difference channel unit 312, and a azimuth difference channel unit 313; the signal processing sub-module 32 includes a signal processing unit 321, a data processing unit 322, and a communication unit 323;
the sum channel unit 311 is configured to perform ADC sampling on the sum channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module 32;
the pitch channel unit 312 is configured to perform ADC sampling on the pitch channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module 32;
the azimuth channel unit 313 is configured to perform ADC sampling on the azimuth channel intermediate frequency signal, and transmit the sampled signal to the signal processing sub-module 32.
The signal processing unit 321 is configured to implement a radar signal processing correlation algorithm, and transmit the processed data to the data processing unit 322;
the data processing unit 322 is configured to implement a radar data processing correlation algorithm;
the communication unit 323 is configured to communicate with the receiving module 2 and output a simulation result of the system.
The memory sub-module 33 is used for storing data of the signal processing sub-module 32 and loading a chip program.
In the example, the signal processing module 3 is provided with 4 SMA interfaces, 3 intermediate frequency SMA input interfaces and 1 clock signal SMA input interface;
the ADC sub-module 31 performs AD sampling on the three channel intermediate frequency signals in the sum channel unit 311, the pitch difference channel unit 312 and the azimuth difference channel unit 313 through 3 SMA input interfaces, the sampling frequency is 500MHz, and then transmits the sampled signals to the signal processing sub-module;
the signal processing unit 321 of the signal processing sub-module 32 adopts, but is not limited to, an XCVX690T model FPGA chip of XILINX, performs filtering and pulse compression processing on the received sampling signal in the unit, and transmits the processed signal to the data processing unit 322; the data processing unit 322 adopts a TMS320C6678 type multi-core DSP chip of TI, and realizes moving target indication MTI, moving target detection MTD, constant false alarm rate detection CFAR, defuzzification, amplitude comparison angle measurement and AGC control detection processing of the monopulse radar in the unit to obtain target distance, speed, pitch angle, azimuth angle and AGC control information after corresponding processing, and transmits the information to the communication unit 323; the communication unit 323 transmits AGC control information to the receiving module 2 and outputs distance, speed, pitch angle, and azimuth angle information of the target; the communication unit 323 adopts an RS422 interface chip to communicate;
the storage sub-module 33 stores data and loading programs using, but not limited to, a FLASH memory chip; the power supply sub-module 34 converts the 220V ac voltage to ±24v dc for which the module is suitable.
Referring to fig. 5, the method for simulating the airborne monopulse radar by using the system is realized as follows:
s1, setting initial parameters in a baseband echo submodule 11 of a radar echo simulation module 1, and simulating three paths of baseband echo data, namely a sum channel, a pitching difference channel and a azimuth difference channel, of a monopulse radar when a carrier flies;
s2, transmitting the three paths of baseband echo data to an echo simulation sub-module 12 to generate a radio frequency echo signal, and outputting the radio frequency echo signal to a receiving module 2;
s3, the receiving module 2 performs down-conversion processing on the three paths of radio frequency echo signals to obtain three paths of intermediate frequency signals, and the three paths of intermediate frequency signals are transmitted to the signal processing module 3;
s4, the signal processing module 3 sequentially samples and processes three paths of intermediate frequency signals through the ADC submodule 31 and the signal processing submodule 32:
s41) the ADC sub-module 31 samples the three intermediate frequency signals and transmits the sampled signals to the signal processing unit 321 in the signal processing sub-module 32;
s42) the signal processing unit 321 performs filtering and pulse compression processing on the three-way sampling signal, and transmits the processed three-way signal to the data processing unit 322;
s43) the data processing unit 322 performs the following two processes simultaneously on the three-way sampling signal:
first kind: firstly, performing mobile target indication MTI and mobile target detection MTD processing on three paths of sampling signals, then performing constant false alarm rate detection CFAR and defuzzification processing on processed sum channel signals, performing single pulse amplitude comparison angle measurement processing on the processed sum channel signals and pitch difference channel signals respectively to obtain corresponding processed target distances, speeds, pitch angles and azimuth angles, and transmitting the processed sum channel signals to a communication unit 323;
second kind: the amplitude of the three paths of sampling signals is subjected to Automatic Gain Control (AGC) detection to obtain AGC control information, and the AGC control information is transmitted to a communication unit 323;
s5, the communication unit 323 transmits the AGC control information to the receiving module 2 and outputs the distance, speed, pitch angle and azimuth angle information of the target, so that the full-flow simulation of the signal processing of the airborne monopulse radar from the front end to the rear end of the antenna is realized.
The above description is only one specific example of the invention and does not constitute any limitation of the invention, and it will be apparent to those skilled in the art that various modifications and changes in form and details may be made without departing from the principles, construction of the invention, but these modifications and changes based on the idea of the invention remain within the scope of the claims of the invention.
Claims (8)
1. The semi-physical simulation system of the airborne monopulse radar is characterized by comprising an echo simulation module (1), a receiving module (2) and a signal processing module (3), wherein the receiving module (2) is respectively connected with the monopulse radar echo simulation module (1) and the signal processing module (3) in a one-way manner;
the echo simulation module (1) comprises a baseband echo submodule (11) and an echo simulation submodule (12), wherein the baseband echo submodule is used for generating a baseband echo signal with target characteristics and carrier flight attitude, and the echo simulation submodule is used for up-converting the baseband echo signal and transmitting the up-converted radio frequency signal to the receiving module (2);
the receiving module (2) is used for transmitting the intermediate frequency signal after the down-conversion of the radio frequency signal to the signal processing module (3); the device comprises a sum channel (21), a pitch difference channel (22), a azimuth difference channel (23), a control submodule (24), a frequency source (25) and a power submodule (26); the three channels are provided with numerical control attenuators, and attenuation of the attenuators is controlled by a control submodule; the frequency source generates high local oscillation signals, low local oscillation signals, synchronous signals of the echo simulation module and clock signals of the signal processing module, which are needed by down-conversion of three channels;
the signal processing module (3) comprises an ADC sub-module (31), a signal processing sub-module (32), a storage sub-module (33) and a power supply sub-module (34), wherein the ADC sub-module samples the intermediate frequency signal and transmits the sampled signal to the signal processing sub-module; the signal processing sub-module performs signal processing on the sampling signal; the storage sub-module is used for storing data of the signal processing sub-module and loading a chip program.
2. The system according to claim 1, characterized in that the baseband echo submodule (11) comprises a parameter setting unit (111), a transmitting unit (112), an antenna unit (113), a target RCS unit (114), a clutter signal unit (115) and a baseband echo generating unit (116);
the parameter setting unit (111) is used for setting basic parameters of the carrier, including information such as flight height, triaxial speed and attitude information of the carrier, and transmitting the basic parameters to the baseband echo generating unit;
the transmitting unit (112) is used for configuring the frequency, the power, the pulse width, the pulse period and the modulation mode of a transmitting signal and transmitting the transmitting signal to the baseband echo generating unit;
the antenna unit (113) is used for generating an antenna pattern of a sum channel, a azimuth difference channel and a pitch difference channel and transmitting the antenna pattern to the baseband echo generating unit;
the target RCS unit (114) is used for setting the target quantity and RCS characteristics and transmitting the target quantity and RCS characteristics to the baseband echo generation unit;
the clutter signal unit (115) is used for setting a clutter signal model and clutter power and transmitting the clutter signal model and the clutter power to the baseband echo generating unit;
the baseband echo generation unit (116) is used for generating baseband echo data of the sum channel, the azimuth difference channel and the elevation difference channel.
3. The system according to claim 1, characterized in that the echo simulation sub-module (12) comprises a signal storage unit (121), an analog signal generation unit (122) and an up-conversion unit (123);
the signal storage unit (121) is used for storing the generated baseband echo data;
the analog signal generating unit (122) is used for converting the stored baseband echo data into an analog signal and outputting the analog signal to the up-conversion unit;
the up-conversion unit (123) is used for up-converting the generated analog signal to a radio frequency band.
4. The system according to claim 1, characterized in that the control submodule (24) comprises a communication unit (241) and a control unit (242);
the communication unit (241) is used for receiving the control information from the signal processing module and transmitting the received information to the control unit;
the control unit (242) is used for transmitting control signals to the numerical control attenuators of the three channels.
5. The system according to claim 1, characterized in that the ADC sub-module (31) comprises a sum channel unit (311), a pitch difference channel unit (312), a azimuth difference channel unit (313);
the sum channel unit (311) is used for carrying out ADC (analog-to-digital conversion) sampling on the sum channel intermediate frequency signal and transmitting the sampled signal to the signal processing sub-module;
the pitching difference channel unit (312) is used for carrying out ADC (analog-to-digital conversion) sampling on the pitching difference channel intermediate frequency signal and transmitting the sampled signal to the signal processing sub-module;
the azimuth difference channel unit (313) is used for carrying out ADC sampling on the azimuth difference channel intermediate frequency signal and transmitting the sampled signal to the signal processing sub-module.
6. The system according to claim 1, characterized in that the signal processing sub-module (32) comprises a signal processing unit (321), a data processing unit (322) and a communication unit (323);
the signal processing unit (321) is used for realizing a radar signal processing related algorithm and transmitting the processed data to the data processing unit;
the data processing unit (322) is used for realizing a radar data processing related algorithm;
the communication unit (323) is used for communicating with the receiving module and outputting the simulation result of the system.
7. A method of simulating an airborne monopulse radar using the system of claim 1, implemented as follows:
setting initial parameters in a baseband echo submodule (11) of a radar echo simulation module (1), and simulating three baseband echo data, namely a sum channel, a pitching difference channel and a azimuth difference channel of a monopulse radar when a carrier flies;
transmitting the three paths of baseband echo data to an echo simulation sub-module (12) to generate a radio frequency echo signal and outputting the radio frequency echo signal to a receiving module (2);
the receiving module (2) performs down-conversion processing on the three paths of radio frequency echo signals to obtain three paths of intermediate frequency signals, and transmits the three paths of intermediate frequency signals to the signal processing module (3);
the signal processing module (3) sequentially samples and processes the three paths of intermediate frequency signals through the ADC submodule (31) and the signal processing submodule (32) and outputs the detection target distance, speed, pitch angle and azimuth angle of the carrier, so that the full-flow simulation of the signal processing of the airborne monopulse radar from the front end to the rear end of the antenna is realized.
8. The method according to claim 7, wherein the ADC sub-module (31) and the signal processing sub-module (32) sample and process the three intermediate frequency signals sequentially, as follows:
the ADC submodule (31) samples three paths of intermediate frequency signals and transmits the sampled signals to a signal processing unit (321) in the signal processing submodule (32);
the signal processing unit (321) performs filtering and pulse compression processing on the three paths of sampling signals and transmits the processed three paths of signals to the data processing unit (322);
the data processing unit (322) performs the following two processes on the three paths of sampling signals simultaneously:
first kind: firstly, performing mobile target indication MTI and mobile target detection MTD processing on three paths of sampling signals, then performing constant false alarm rate detection CFAR and defuzzification processing on processed sum channel signals, performing single pulse amplitude comparison angle measurement processing on the processed sum channel signals and pitch difference channel signals respectively to obtain corresponding processed target distances, speeds, pitch angles and azimuth angles, and transmitting the processed sum channel signals to a communication unit (323);
second kind: performing Automatic Gain Control (AGC) detection on the amplitudes of the three paths of sampling signals to obtain AGC control information, and transmitting the AGC control information to a communication unit (323);
the communication unit (323) transmits AGC control information to the receiving module (2) and outputs distance, speed, pitch angle, and azimuth angle information of the detection target.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117518090A (en) * | 2024-01-04 | 2024-02-06 | 北京七星华创微波电子技术有限公司 | Miniaturized light-weight C-band receiving and transmitting front end with automatic calibration function |
| CN118671718A (en) * | 2024-08-01 | 2024-09-20 | 国营洛阳丹城无线电厂 | Guided data chain function simulation method applied to introduced radar product simulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117518090A (en) * | 2024-01-04 | 2024-02-06 | 北京七星华创微波电子技术有限公司 | Miniaturized light-weight C-band receiving and transmitting front end with automatic calibration function |
| CN118671718A (en) * | 2024-08-01 | 2024-09-20 | 国营洛阳丹城无线电厂 | Guided data chain function simulation method applied to introduced radar product simulation |
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