CN217932042U - Radar echo and interference simulation device - Google Patents
Radar echo and interference simulation device Download PDFInfo
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- CN217932042U CN217932042U CN202222150115.1U CN202222150115U CN217932042U CN 217932042 U CN217932042 U CN 217932042U CN 202222150115 U CN202222150115 U CN 202222150115U CN 217932042 U CN217932042 U CN 217932042U
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Abstract
The utility model provides a simulation radar echo and interference device, which comprises an antenna, a radio frequency cable, a broadband radio frequency module and a digital processing module; the antenna is in communication connection with the target radar and the radio frequency cable; the radio frequency cable is in communication connection with the antenna and the broadband radio frequency module; the broadband radio frequency module is in communication connection with the radio frequency cable and the digital processing module; the digital processing module is in communication connection with the broadband radio frequency module; and a low-cost solution is provided for radar technical system verification and functional performance verification.
Description
Technical Field
The utility model belongs to the technical field of radar equipment, especially, relate to a simulation radar echo and interference device.
Background
With the development of science and technology, radar is increasingly important as an indispensable strategic weapon. The radar is mainly used for monitoring the environment and acting on the environment. Therefore, it is crucial for the radar to determine its monitoring performance. Generally, to acquire the monitoring performance of the radar, an environment needs to be actually detected, and then the actual detection result is compared with the detection result of the radar to determine the monitoring performance of the radar. In addition, the detection results of other radars with higher accuracy can be used as the standard detection result, and then the monitoring performance of the detected radar can be determined by comparing the standard detection result with the detection result of the detected radar. However, whether actual detection or detection by other radars is performed requires a great cost to be realized, and the accuracy is not high.
In view of this, some embodiments in the present disclosure provide an analog radar echo and interference apparatus to provide a low-cost solution for radar technology system verification and functional performance verification.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems existing in the background technology, the utility model provides an analog radar echo and interference device, which comprises an antenna, a radio frequency cable, a broadband radio frequency module and a digital processing module; the antenna is in communication connection with the target radar and the radio frequency cable so as to receive signals sent by the target radar and obtain received signals; receiving and transmitting an echo signal or an interference signal; the radio frequency cable is in communication connection with the antenna and the broadband radio frequency module so as to send the received signal to the broadband radio frequency module; and sending the echo signal or the interference signal to the antenna; the broadband radio frequency module is in communication connection with the radio frequency cable and the digital processing module so as to input the received signal into the digital processing module after frequency conversion; the initial echo signal and the initial interference signal are subjected to frequency conversion to generate the echo signal or the interference signal; the digital processing module is in communication connection with the broadband radio frequency module so as to receive the frequency-converted received signal; and generating the initial echo signal or the initial interference signal.
Furthermore, the broadband radio frequency module comprises a receiving front end, a solid-state power amplifier, a down-conversion channel, an up-conversion channel and a frequency synthesizer; the receiving front end is in communication connection with the radio frequency cable and the down-conversion channel so as to filter and amplify a received signal to obtain a first filtered signal, and the first filtered signal is input to the down-conversion channel; the down-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to perform down-conversion processing on the first filtering signal to obtain an intermediate frequency signal, and the intermediate frequency signal is input into the digital processing module; the up-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to up-convert the echo signal and the interference signal to obtain a high-frequency signal; the solid-state power amplifier is in communication connection with the up-conversion channel and the antenna so as to filter and amplify the high-frequency signal and input the high-frequency signal to the antenna; the frequency synthesizer is in communication connection with the up-conversion channel and the down-conversion channel to generate local oscillation signals for the up-conversion channel and the down-conversion channel.
Further, the down-conversion channel comprises a limiter, a switch filter, an amplifier, an attenuator, a single-pole double-throw switch, a filter and a mixer; inputting the received signals into a first amplitude limiter and a second amplitude limiter respectively; the first amplitude limiter is in communication connection with a first switch filter, the first switch filter is in communication connection with a first amplifier, and the first amplifier is in communication connection with a first attenuator; the second limiter is connected with the second amplifier in communication; the first attenuator and the second amplifier are both communicatively coupled to a first single-pole double-throw switch, the first single-pole double-throw switch is communicatively coupled to a second switch filter, the second switch filter is communicatively coupled to a third amplifier, the third amplifier is communicatively coupled to an adjustable attenuator, the adjustable attenuator is communicatively coupled to a third switch filter, the third switch filter is communicatively coupled to a fourth amplifier, the fourth amplifier is communicatively coupled to a second attenuator, the second attenuator is communicatively coupled to a first filter, the first filter is communicatively coupled to a third attenuator, the third attenuator is communicatively coupled to a first mixer, the first mixer is communicatively coupled to a fourth attenuator and a fifth attenuator, the fifth attenuator is communicatively coupled to a second filter, the second filter is communicatively coupled to a sixth attenuator, the sixth attenuator is communicatively coupled to a third filter, the third filter is communicatively coupled to a fifth amplifier, the fifth amplifier is communicatively coupled to a seventh attenuator, the seventh mixer is communicatively coupled to a second mixer, the second mixer is communicatively coupled to an eighth attenuator, the eighth attenuator is communicatively coupled to a fourth attenuator, the eighth attenuator is communicatively coupled to a ninth amplifier, the ninth amplifier is communicatively coupled to a ninth attenuator, and the ninth amplifier.
Furthermore, the frequency synthesizer comprises a phase discriminator, a filter, a voltage-controlled oscillator, a power divider, an attenuator, an amplifier, a frequency divider, a frequency multiplier and a single-pole double-throw switch; a signal is input from a phase discriminator, the phase discriminator is in communication connection with a sixth filter, the sixth filter is in communication connection with a voltage-controlled oscillator, the voltage-controlled oscillator is in communication connection with a power divider, and the power divider is in communication connection with a twelfth attenuator and an eleventh attenuator; the twelfth attenuator is in communication connection with a tenth amplifier, the tenth amplifier is in communication connection with a frequency divider, the frequency divider is in communication connection with a ninth amplifier, and the ninth amplifier is in communication connection with the phase discriminator; the eleventh attenuator is in communication connection with a frequency multiplier, the frequency multiplier is in communication connection with a thirteenth attenuator, the thirteenth attenuator is in communication connection with a second single-pole double-throw switch, and the second single-pole double-throw switch is in communication connection with a seventh filter and an eighth filter; the seventh filter and the eighth filter are both in communication connection with a third single-pole double-throw switch, the third single-pole double-throw switch is in communication connection with a fourteenth attenuator, and the fourteenth attenuator is in communication connection with an eleventh amplifier.
Furthermore, the digital processing module comprises a signal acquisition and measurement unit, a signal sorting and identification unit, a radar echo simulation unit and an interference signal generation unit; the signal acquisition and measurement unit is in communication connection with the broadband radio frequency module to acquire and measure the frequency-converted received signals to obtain a plurality of pulse description words PDW; the signal sorting and identifying unit is in communication connection with the signal acquisition and measurement unit so as to sort each pulse based on the pulse description word PDW to obtain a sorting result; the radar echo simulation unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to simulate an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter; the interference signal generating unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to generate an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter.
Further, the radar echo simulation unit comprises an analog-to-digital converter (ADC), a quadrature generator, a Doppler generator, a modulator, a range delayer, a synthesizer and a digital-to-analog converter (DAC); a signal may be input from the analog-to-digital converter ADC, which is communicatively connected to the quadrature generator; the orthogonal generator is respectively connected with the first Doppler generator, the second Doppler generator and the third Doppler generator in a communication way; the first Doppler generator is in communication with a first modulator, which is in communication with a first range retarder; the second doppler generator is communicatively coupled to a second modulator, which is communicatively coupled to a second range retarder; the third doppler generator is communicatively coupled to a third modulator, which is communicatively coupled to a third range retarder; the first distance delayer, the second distance delayer and the third distance delayer are all connected with the synthesizer in a communication mode; the synthesizer is in communication connection with the digital-to-analog converter DAC.
Further, the digital processing module comprises an ADC, a DAC, an FPGA and a memory; the conversion rate of the ADC is 2.5Gsps, and the sampling rate is 12 bits; the conversion rate of the DAC is 2.5Gsps, and the sampling rate is 14 bits; the FPGA comprises a first FPGA and a second FPGA, and the first FPGA and the second FPGA are used for digital receiving processing and interference processing of 1GHz bandwidth in the frequency range of 1.3 GHz-2.3 GHz; the memory comprises a plurality of groups of DDR3 memories, and the capacity of each DDR3 memory is 4Gbit.
Furthermore, the device also comprises a power supply module and an input/output interface; the power supply module is internally provided with a surge suppression circuit and a filter circuit; the input and output interface comprises a radio frequency input port, a radio frequency output port, a power supply port, an RS232 port and an RJ45 network port. The device for simulating the radar echo and the interference is characterized in that the frequency band of the antenna is 4-12 GHz, the gain is not less than 0dBi, the coverage range of the antenna is 360 degrees horizontally, and the pitching is not less than +/-15 degrees; the standing wave ratio of the antenna is less than 2.0.
Further, simulation radar echo and interference device sets up on unmanned aerial vehicle.
The utility model has the advantages of as follows and beneficial effect:
the utility model discloses in, through the complicated electromagnetic environment in the real battlefield of simulation, verify for radar technology system, functional performance verifies and provides low-cost solution.
Drawings
Fig. 1 is a schematic diagram of a simulated radar echo and jamming device according to some embodiments of the present invention;
fig. 2 is a schematic diagram of a wideband rf module provided in some embodiments of the present invention;
fig. 3 is a schematic diagram of an up-conversion channel provided by some embodiments of the present invention;
fig. 4 is a schematic diagram of frequency synthesizers provided by some embodiments of the present invention;
fig. 5 is a schematic diagram of a digital processing module according to some embodiments of the present invention;
fig. 6 is a schematic diagram of a radar echo simulation unit provided by some embodiments of the present invention;
fig. 7 is a view of a working scene of an apparatus for simulating radar echo and interference according to some embodiments of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram of an apparatus for simulating radar echo and interference according to some embodiments of the present invention. As shown in fig. 1, the analog radar echo and interference device includes an antenna, a radio frequency cable, a wideband radio frequency module, and a digital processing module.
The antenna is in communication connection with the target radar and the radio frequency cable to receive signals sent by the target radar and obtain received signals; and receiving and transmitting echo signals or interference signals. The antenna adopts an omnidirectional antenna and receives and transmits time division multiplexing.
In some embodiments, the frequency band of the antenna can be 4-12 GHz, the gain is not less than 0dBi, the coverage area of the antenna is 360 degrees horizontally, and the pitch is not less than ± 15 degrees; the standing wave ratio of the antenna is less than 2.0.
The radio frequency cable is in communication connection with the antenna and the broadband radio frequency module so as to send the received signal to the broadband radio frequency module; and sending the echo signal or the interference signal to the antenna.
The broadband radio frequency module is in communication connection with the radio frequency cable and the digital processing module so as to input the received signal into the digital processing module after frequency conversion; and carrying out frequency conversion on the initial echo signal and the initial interference signal to generate an echo signal or an interference signal.
The digital processing module is in communication connection with the broadband radio frequency module to receive the frequency-converted received signal; and generating an initial echo signal or an initial interference signal. The digital processing module integrates a high-speed ADC, a high-speed DAC, a large-scale FPGA and the like, and mainly completes the functions of signal detection, parameter measurement, sample extraction, time sequence control, interference modulation, echo simulation, a communication interface and the like.
In some embodiments, the digital processing module includes an ADC, a DAC, an FPGA, and a memory. The conversion rate of the ADC is 2.5Gsps and the sampling rate is 12 bits. The conversion rate of the DAC is 2.5Gsps, and the sampling rate is 14 bits. The FPGA comprises a first FPGA and a second FPGA, and the first FPGA and the second FPGA are used for digital receiving processing and interference processing of 1GHz bandwidth within the frequency range of 1.3 GHz-2.3 GHz. The memory comprises a plurality of groups of DDR3 memories, and the capacity of each DDR3 memory is 4Gbit.
In some embodiments, the analog radar echo and interference device may further include a power module and an input-output interface; the power module is internally provided with a surge suppression circuit and a filter circuit. The input and output interface comprises a radio frequency input port, a radio frequency output port, a power supply port, an RS232 port and an RJ45 network port.
The power supply module converts the input AC 220V 50Hz power supply into DC12V power supply for equipment, and the receiving frequency conversion channel module and the digital part complete DC/DC conversion inside the respective modules. The index requirement power consumption of the AC/DC power supply module is not higher than 250W, and COA120-220S12 with DC12V/25A output is selected in consideration of a certain margin.
The antenna receives radio frequency signals, the radio frequency signals enter the broadband radio frequency module through a cable, the radio frequency signals enter the frequency conversion module after being instantly covered by a broadband at 4 GHz-12 GHz inside the module, 1 path of intermediate frequency signals with a 1GHz bandwidth (1.3 GHz-2.3 GHz) are output, and the digital processing module carries out signal detection and parameter measurement to form PDW parameters. And the digital processing module simultaneously performs signal sampling storage and executes corresponding interference signal modulation according to the signal sorting identification result and the interference control command. The interference signal is up-converted and output after D/A conversion.
The power supply module converts externally provided DC 28V power supply into internally required direct current power supply.
Fig. 2 is a schematic diagram of a wideband rf module according to some embodiments of the present invention. As shown in fig. 2, the wideband rf module includes a receiving front end, a solid-state power amplifier, a down-conversion channel, an up-conversion channel, and a frequency synthesizer.
When receiving, the broadband radio frequency module mainly completes the filtering amplification and down-conversion of radio frequency signals to form intermediate frequency signals and sends the intermediate frequency signals to the digital processing module; during transmission, the intermediate frequency interference signal from the digital processing module is subjected to up-conversion, filtering and amplification and then sent to an antenna; meanwhile, point frequency source signals such as a reference clock, a sampling clock and the like are provided for the system.
The receiving front end is in communication connection with the radio frequency cable and the down-conversion channel so as to filter and amplify the received signal to obtain a first filtered signal, and the first filtered signal is input into the down-conversion channel. For example, the receiving front end receives 1 path of signals from 4GHz to 12GHz, mixes and filters the signals with a local oscillator, and then filters, amplifies and outputs the signals to the digital processing module.
The down-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to perform down-conversion processing on the first filtering signal to obtain an intermediate frequency signal, and the intermediate frequency signal is input into the digital processing module. For example, the down-conversion channel can convert the input 1 path of 4 GHz-12 GHz signals into 1.8GHz +/-500 MHz intermediate frequency signals through filtering and frequency conversion and output the signals.
The up-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to up-convert the echo signal and the interference signal to obtain a high-frequency signal.
And the solid-state power amplifier is in communication connection with the up-conversion channel and the antenna so as to filter and amplify the high-frequency signal and input the high-frequency signal into the antenna.
The frequency synthesizer is in communication with the up-conversion channel and the down-conversion channel to generate local oscillator signals for the up-conversion channel and the down-conversion channel. The frequency synthesizer mainly generates a local oscillator signal sent to the frequency conversion assembly and a system sampling clock sent to the signal acquisition and processing. In the working process, the frequency synthesizer is communicated with the digital processing module through a synchronous serial port, receives various working parameters from the digital processing module, controls the frequency conversion component and finishes the report of the working states of the frequency synthesizer and the frequency conversion component.
In some embodiments, the wideband radio frequency module includes 1 down conversion component, 1 up conversion component, 1 frequency source module, 1 2.4g clock component. The broadband radio frequency module consists of 2 3U submodules and jointly completes the functions of up-down frequency conversion, power amplification and the like.
Fig. 3 is a schematic diagram of a down conversion channel according to some embodiments of the present invention. As shown in fig. 3, the downconversion channel includes a limiter, a switch filter, an amplifier, an attenuator, a single pole double throw switch, a filter, and a mixer.
In some embodiments, the down conversion channel employs a single channel conversion scheme, dividing the frequency into 3 bands: 3 GHz-5.4 GHz, 5.2 GHz-8.3 GHz and 8.1 GHz-12.5 GHz, and a switch filter bank is adopted for selecting frequency bands. And frequency conversion is carried out twice, and finally the frequency is reduced to 1.8GHz.
The received signal is input to a first limiter and a second limiter, respectively. The first limiter is in communication with a first switched filter, the first switched filter is in communication with a first amplifier, and the first amplifier is in communication with a first attenuator. The second amplitude limiter is connected with the second amplifier in communication; the first attenuator and the second amplifier are both communicatively connected to a first single-pole double-throw switch, the first single-pole double-throw switch is communicatively connected to a second switch filter, the second switch filter is communicatively connected to a third amplifier, the third amplifier is communicatively connected to an adjustable attenuator, the adjustable attenuator is communicatively connected to a third switch filter, the third switch filter is communicatively connected to a fourth amplifier, the fourth amplifier is communicatively connected to a second attenuator, the second attenuator is communicatively connected to a first filter, the first filter is communicatively connected to a third attenuator, the third attenuator is communicatively connected to a first mixer, the first mixer is communicatively connected to a fourth attenuator and a fifth attenuator, the fifth attenuator is communicatively connected to a second filter, the second filter is communicatively connected to a sixth attenuator, the sixth attenuator is communicatively connected to a third filter, the third filter is communicatively connected to a fifth amplifier, the fifth amplifier is communicatively connected to a seventh attenuator, the seventh mixer is communicatively connected to a second mixer, the second mixer is connected to an eighth communication amplifier, the eighth attenuator is communicatively connected to the fourth filter, the fourth filter is communicatively connected to the sixth amplifier, the seventh attenuator is communicatively connected to a ninth amplifier, the ninth amplifier is connected to a ninth amplifier, and the ninth amplifier.
In some embodiments, the link rf end of the down conversion channel is preset with 40dB digitally controlled attenuation, which is 1,2,4,8, 16, 40dB steps, respectively. In addition, the channel reserves 1bit calibration bit for adjusting the consistency between the switch filters (the selectable range is 1-3 dB). Meanwhile, 2-bit fixed adjusting bits are used for adjusting amplitude consistency between channels (the control bits left after the calibration bits are fixed at 0 level or high level to realize channel gain adjustment).
Fig. 4 is a schematic diagram of frequency synthesizers according to some embodiments of the present invention. As shown in fig. 4, the frequency synthesizer includes a phase detector, a filter, a voltage controlled oscillator, a power divider, an attenuator, an amplifier, a frequency divider, a frequency multiplier, and a single-pole double-throw switch.
The signal is input from the phase discriminator, the phase discriminator is in communication connection with a sixth filter, the sixth filter is in communication connection with a voltage-controlled oscillator, the voltage-controlled oscillator is in communication connection with a power divider, and the power divider is in communication connection with a twelfth attenuator and an eleventh attenuator. The twelfth attenuator is in communication connection with the tenth amplifier, the tenth amplifier is in communication connection with the frequency divider, the frequency divider is in communication connection with the ninth amplifier, and the ninth amplifier is in communication connection with the phase discriminator. The eleventh attenuator is in communication connection with the frequency multiplier, the frequency multiplier is in communication connection with the thirteenth attenuator, the thirteenth attenuator is in communication connection with the second single-pole double-throw switch, and the second single-pole double-throw switch is in communication connection with the seventh filter and the eighth filter; the seventh filter and the eighth filter are both in communication connection with a third single-pole double-throw switch, the third single-pole double-throw switch is in communication connection with a fourteenth attenuator, and the fourteenth attenuator is in communication connection with the eleventh amplifier.
In some embodiments, the phase detector is GM4704 from China, the voltage controlled oscillator VCO is HMC773, a 12-20GHz frequency signal is output, the signal is output to 24-40GHz through double frequency, and finally the signal is divided into two sections (24-32GHz and 32-40 GHz) through a switch filter, and the function of the switch filter is mainly to filter harmonic waves. The adjustable attenuator is HMC472LP4E, the attenuation range of the attenuator is 0 dB-31.5 dB, and the step is 0.5dB.
Fig. 5 is a schematic diagram of a digital processing module according to some embodiments of the present invention. As shown in fig. 5, the digital processing module includes a signal acquisition and measurement unit, a signal sorting and identification unit, a radar echo simulation unit, and an interference signal generation unit.
The signal acquisition and measurement unit is in communication connection with the broadband radio frequency module to acquire and measure the frequency-converted received signals and obtain a plurality of Pulse Description Words (PDW).
The signal sorting and identifying unit is in communication connection with the signal acquisition and measurement unit so as to carry out sorting processing on each pulse based on the pulse description word PDW and obtain a sorting result.
The radar echo simulation unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to simulate the echo signal of the target radar based on the pulse description word PDW, the sorting result and the echo control parameter.
The interference signal generating unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to generate an interference signal of the target radar based on the pulse description word PDW, the sorting result and the interference control parameter.
In some embodiments, the digital processing module is provided with 1 path of 2.5Gsps 12bit ADC, 1 path of 2.5Gsps 14bit DAC, and then connected with 2 xilinx 7 series of FPGAs, and is used for 1GHz bandwidth digital receiving processing and interference processing within the frequency range of 1.3 GHz-2.3 GHz. And multiple groups of DDR3 memories in the modules are used for storing original data and PDW data. DDR3 chooses 4Gbit capacity (256M 16bit), each group of 2 chips, A group and B group together constitute 256M 32bit ping-pong memory, is used for depositing the original data of 2.5Gsps sampling rate 12bit the most. The clock is implemented using LMK 04828.
Fig. 6 is a schematic diagram of a radar echo simulation unit according to some embodiments of the present invention. As shown in fig. 6, the radar echo simulation unit includes an analog-to-digital converter ADC, a quadrature generator, a doppler generator, a modulator, a range delay, a synthesizer, and a digital-to-analog converter DAC.
The signal may be input from an analog-to-digital converter ADC that is communicatively coupled to the quadrature generator.
The quadrature generator is in communication with the first doppler generator, the second doppler generator, and the third doppler generator, respectively.
The first doppler generator is communicatively coupled to a first modulator, which is communicatively coupled to a first range retarder.
The second doppler generator is communicatively coupled to a second modulator, which is communicatively coupled to a second range retarder.
The third doppler generator is communicatively coupled to a third modulator, which is communicatively coupled to a third range retarder.
The first range retarder, the second range retarder, and the third range retarder are each communicatively coupled to the combiner.
The synthesizer is in communication with the digital-to-analog converter DAC.
Fig. 7 is a view of a working scene of an apparatus for simulating radar echo and interference according to some embodiments of the present invention. As shown in fig. 7, the simulated radar echo and jamming device may be located on the drone.
Planning a radar echo simulation scene comprises the steps that an interference machine is deployed on an unmanned aerial vehicle, and the lift-off height is 50-120 m; jammer range radar: 0.5-1.5 km. The planned target scene simulation parameters include, target distance: 20-300 km; target height: 3000-30000 m; target speed: mach 6 to 6. The radar echo and interference simulator selects a radar echo signal working mode, and can simulate radar echo signals with different distances, speeds and RCS characteristics.
In some embodiments, the simulated radar echo and interference device can simulate the monitoring target of the target radar by means of radial approximation, radial distance, oblique line sweeping, curve sweeping and the like. The target radar may refer to a radar that requires a monitoring performance check.
The planning of the radial approximation simulation scene is that the simulation device is deployed on the unmanned aerial vehicle, the distance between the simulation device and the target radar is about 1km, the levitation height is about 100m, and the simulation target gradually approximates the target radar from 300km to 20 km.
The scene of radial far-away simulation is planned in such a way that a simulation device is deployed on an unmanned aerial vehicle, the distance between the simulation device and a target radar is about 1km, the levitation height is about 100m, and a simulation target gradually gets far away from the target radar from 20km to 300 km.
The scene of the oblique line sweeping simulation is planned in such a way that the simulation device is deployed on the unmanned aerial vehicle, the distance between the simulation device and a target radar is about 1km, the levitation height is about 100m, and the unmanned aerial vehicle sweeps the target radar from a certain area in an oblique line manner. The simulated target sweeps across the target radar from the same area at a greater distance.
The curve sweep simulation scene is planned in such a way that the simulation device is deployed on the unmanned aerial vehicle, the distance between the simulation device and a target radar is about 1km, the lift-off height is about 100m, and the unmanned aerial vehicle sweeps the target radar from a certain area in an oblique line manner. The simulated target sweeps across the target radar from the curve in the same sector range.
In some embodiments, the simulated radar echo and interference device can be used as a fixed interference source, radiate interference signals in a set area, and verify various generated patterns and interference effects on a target radar. Interference pattern test items include, wideband noise: the bandwidth is adjustable. Aiming frequency noise: the frequency aiming precision is less than 1KHz. Single target drag distance drag speed: fixed drag distance, constant speed drag distance and accelerated drag distance. Multi-target drag distance drag speed: target number, space, uniform speed and acceleration.
In other embodiments, the simulated radar echo and interference device can be deployed on an unmanned aerial vehicle, and the simulated electronic warfare aircraft can cruise on a runway outside a radar defense area, and can release cheating or suppress interference in the process and shield other equipment for sudden prevention so as to simulate a typical interference supporting scene.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An analog radar echo and interference device is characterized by comprising an antenna, a radio frequency cable, a broadband radio frequency module and a digital processing module;
the antenna is in communication connection with the target radar and the radio frequency cable so as to receive signals sent by the target radar and obtain received signals; receiving and transmitting an echo signal or an interference signal;
the radio frequency cable is in communication connection with the antenna and the broadband radio frequency module so as to send the received signal to the broadband radio frequency module; and sending the echo signal or the interference signal to the antenna;
the broadband radio frequency module is in communication connection with the radio frequency cable and the digital processing module so as to input the received signal into the digital processing module after frequency conversion; the initial echo signal and the initial interference signal are subjected to frequency conversion to generate the echo signal or the interference signal;
the digital processing module is in communication connection with the broadband radio frequency module so as to receive the frequency-converted received signal; and generating the initial echo signal or the initial interference signal.
2. The analog radar echo and interference device of claim 1, wherein the wideband radio frequency module comprises a receive front end, a solid state power amplifier, a down conversion channel, an up conversion channel, and a frequency synthesizer;
the receiving front end is in communication connection with the radio frequency cable and the down-conversion channel so as to filter and amplify a received signal to obtain a first filtered signal, and the first filtered signal is input to the down-conversion channel;
the down-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to perform down-conversion processing on the first filtering signal to obtain an intermediate frequency signal, and the intermediate frequency signal is input into the digital processing module;
the up-conversion channel is in communication connection with the receiving front end, the digital processing module and the frequency synthesizer so as to up-convert the echo signal and the interference signal to obtain a high-frequency signal;
the solid-state power amplifier is in communication connection with the up-conversion channel and the antenna so as to filter and amplify the high-frequency signal and input the high-frequency signal to the antenna;
the frequency synthesizer is in communication connection with the up-conversion channel and the down-conversion channel to generate local oscillation signals for the up-conversion channel and the down-conversion channel.
3. The analog radar echo and interference device of claim 2, wherein the downconversion channel comprises a limiter, a switching filter, an amplifier, an attenuator, a single-pole double-throw switch, a filter, and a mixer;
inputting the received signals into a first amplitude limiter and a second amplitude limiter respectively;
the first amplitude limiter is in communication connection with a first switch filter, the first switch filter is in communication connection with a first amplifier, and the first amplifier is in communication connection with a first attenuator;
the second limiter is connected with the second amplifier in communication;
the first attenuator and the second amplifier are both communicatively coupled to a first single-pole double-throw switch, the first single-pole double-throw switch is communicatively coupled to a second switch filter, the second switch filter is communicatively coupled to a third amplifier, the third amplifier is communicatively coupled to an adjustable attenuator, the adjustable attenuator is communicatively coupled to a third switch filter, the third switch filter is communicatively coupled to a fourth amplifier, the fourth amplifier is communicatively coupled to a second attenuator, the second attenuator is communicatively coupled to a first filter, the first filter is communicatively coupled to a third attenuator, the third attenuator is communicatively coupled to a first mixer, the first mixer is communicatively coupled to a fourth attenuator and a fifth attenuator, the fifth attenuator is communicatively coupled to a second filter, the second filter is communicatively coupled to a sixth attenuator, the sixth attenuator is communicatively coupled to a third filter, the third filter is communicatively coupled to a fifth amplifier, the fifth amplifier is communicatively coupled to a seventh attenuator, the seventh mixer is communicatively coupled to a second mixer, the second mixer is communicatively coupled to an eighth attenuator, the eighth attenuator is communicatively coupled to a fourth attenuator, the eighth attenuator is communicatively coupled to a ninth amplifier, the ninth amplifier is communicatively coupled to a ninth attenuator, and the ninth amplifier.
4. The analog radar echo and interference device of claim 2, wherein the frequency synthesizer comprises a phase detector, a filter, a voltage controlled oscillator, a power divider, an attenuator, an amplifier, a frequency divider, a frequency multiplier, and a single-pole double-throw switch;
a signal is input from a phase discriminator, the phase discriminator is in communication connection with a sixth filter, the sixth filter is in communication connection with a voltage-controlled oscillator, the voltage-controlled oscillator is in communication connection with a power divider, and the power divider is in communication connection with a twelfth attenuator and an eleventh attenuator;
the twelfth attenuator is in communication connection with a tenth amplifier, the tenth amplifier is in communication connection with a frequency divider, the frequency divider is in communication connection with a ninth amplifier, and the ninth amplifier is in communication connection with the phase discriminator;
the eleventh attenuator is in communication connection with a frequency multiplier, the frequency multiplier is in communication connection with a thirteenth attenuator, the thirteenth attenuator is in communication connection with a second single-pole double-throw switch, and the second single-pole double-throw switch is in communication connection with a seventh filter and an eighth filter; the seventh filter and the eighth filter are both connected with a third single-pole double-throw switch in communication, the third single-pole double-throw switch is connected with a fourteenth attenuator in communication, and the fourteenth attenuator is connected with an eleventh amplifier in communication.
5. The simulated radar echo and interference device of claim 1, wherein the digital processing module comprises a signal acquisition and measurement unit, a signal sorting and identification unit, a radar echo simulation unit and an interference signal generation unit;
the signal acquisition and measurement unit is in communication connection with the broadband radio frequency module to acquire and measure the frequency-converted received signals to obtain a plurality of pulse description words PDW;
the signal sorting and identifying unit is in communication connection with the signal acquisition and measurement unit so as to sort each pulse based on the pulse description word PDW to obtain a sorting result;
the radar echo simulation unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to simulate an echo signal of the target radar based on the pulse description word PDW, the sorting result and an echo control parameter;
the interference signal generating unit is in communication connection with the signal acquisition and measurement unit and the signal sorting and identification unit so as to generate an interference signal of the target radar based on the pulse description word PDW, the sorting result and an interference control parameter.
6. The device of claim 5, wherein the radar echo simulating unit comprises an analog-to-digital converter (ADC), a quadrature generator, a Doppler generator, a modulator, a range delayer, a synthesizer and a digital-to-analog converter (DAC);
a signal may be input from the analog-to-digital converter ADC, which is communicatively connected to the quadrature generator;
the orthogonal generator is respectively connected with the first Doppler generator, the second Doppler generator and the third Doppler generator in a communication way;
the first Doppler generator is in communication with a first modulator, which is in communication with a first range retarder;
the second doppler generator is communicatively coupled to a second modulator, which is communicatively coupled to a second range retarder;
the third doppler generator is communicatively coupled to a third modulator, which is communicatively coupled to a third range retarder;
the first distance delayer, the second distance delayer and the third distance delayer are all connected with the synthesizer in a communication mode;
the synthesizer is connected with the digital-to-analog converter DAC in a communication mode.
7. The analog radar echo and interference device of claim 1, wherein the digital processing module comprises an ADC, a DAC, an FPGA, and a memory;
the conversion rate of the ADC is 2.5Gsps, and the sampling rate is 12 bits;
the conversion rate of the DAC is 2.5Gsps, and the sampling rate is 14 bits;
the FPGA comprises a first FPGA and a second FPGA, and the first FPGA and the second FPGA are used for digital receiving processing and interference processing of 1GHz bandwidth in the frequency range of 1.3 GHz-2.3 GHz;
the memory comprises a plurality of groups of DDR3 memories, and the capacity of each DDR3 memory is 4Gbit.
8. The analog radar echo and interference device of claim 1, further comprising a power module and an input-output interface;
the power supply module is internally provided with a surge suppression circuit and a filter circuit;
the input and output interface comprises a radio frequency input port, a radio frequency output port, a power supply port, an RS232 port and an RJ45 network port.
9. The analog radar echo and interference device of claim 1, wherein the frequency band of the antenna is 4-12 GHz, the gain is not less than 0dBi, the coverage of the antenna is 360 ° horizontally, and the pitch is not less than ± 15 °; the standing wave ratio of the antenna is less than 2.0.
10. The simulated radar echo and jamming device according to any one of claims 1-9, wherein the simulated radar echo and jamming device is disposed on a drone.
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