Unmanned aerial vehicle-mounted multimode broadband radar simulation electronic target system and method

Abstract

The invention, which relates to the radar simulation and electronic countermeasure field, provides a multi-mode broadband radar simulation electronic target system and method for an unmanned aerial vehicle, and the system comprises an upper computer, a ZYNQ signal processing module, an ADRV9009 radio frequency transceiver module and a transmitting module which are connected in sequence. According to the invention, a ZYNQ signal processing module and an ADRV9009 radio frequency transceiver module are taken as hardware bases, multimode radar simulation is taken as a software architecture, various radar waveforms are generated and adjusted according to key characteristic indexes of a radar, inter-pulse characteristics, intra-pulse characteristics and frequency tuning are supported, and radar signals in a complex electromagnetic environment are accurately simulated.

Description

Technical Field

[0001] The present invention relates to the field of radar simulation and electronic countermeasures, and particularly to an airborne multi-mode broadband radar simulation electronic target system and method for unmanned aerial vehicles. Background Art

[0002] Currently, common radar echo simulators are divided into three categories: pure software radar simulators, simulators based on radar echo simulation boards, and simulators integrating multiple boards. The pure software simulator relies on computer programming to generate target signals, clutter, and interference information, with low development costs. However, due to the lack of hardware optimization in general-purpose computers for signal processing, the generation speed is slow, and the real-time performance is poor, making it difficult to adapt to complex dynamic scenarios. The simulator based on the simulation board generates echo signals through dedicated hardware, with improved performance and real-time performance. However, it is limited by the memory capacity of the board, with poor flexibility, and can only meet the requirements of specific scenarios. The simulator integrating multiple boards can simulate complex electromagnetic environments through the coordinated work of components such as playback boards, processing boards, storage boards, and main control boards, with the advantages of fast signal generation speed and high real-time performance. However, the system is large in volume, high in power consumption, and low in integration, and is not suitable for being carried on an unmanned aerial vehicle platform. There is still much room for improvement in terms of miniaturization, high integration, and flexibility for these technologies. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an airborne multi-mode broadband radar simulation electronic target system and method for unmanned aerial vehicles, which are used to solve the problems that the existing radar simulators still have deficiencies in terms of miniaturization, high integration, and flexibility.

[0004] The present invention provides an airborne multi-mode broadband radar simulation electronic target system for unmanned aerial vehicles, including a host computer, a ZYNQ signal processing module, an ADRV9009 radio frequency transceiver module, and a transmitting module connected in sequence.

[0005] Preferably:

[0006] The ZYNQ signal processing module includes: a processor and a programmable logic module;

[0007] The processor includes a radar signal generation module, an internal interconnection module, and a platform control module;

[0008] The programmable logic module includes: a baseband processing module and a data interface;

[0009] The platform control module is connected to the host computer through a network interface;

[0010] The platform control module, the radar signal generation module, the internal interconnection module, the baseband processing module, and the data interface are connected in sequence.

[0011] Preferably:

[0012] The radar signal generation module includes: a frequency agility feature module, a pulse repetition frequency (PRF) feature module, and an intra-pulse feature module;

[0013] The frequency agility feature module is used to generate radar frequency agility signals, the PRF feature module is used to generate radar PRF signals, and the intra-pulse feature module is used to generate radar intra-pulse modulation signals.

[0014] Preferably:

[0015] The ADRV9009 radio frequency transceiver module includes: a local oscillator switching module, a transmit switch, a filtering module, a mixing module, a gain control module, and a digital-to-analog conversion module;

[0016] The platform control module is connected to the local oscillator switching module and the transmit switch through the SPI interface and the GPIO interface;

[0017] The data interface is connected to the digital-to-analog conversion module through the JESD204B interface;

[0018] The digital-to-analog conversion module, the gain control module, the mixing module, and the filtering module are connected in sequence.

[0019] Preferably:

[0020] The transmit module includes: a first SMA module, a first power amplifier module, a second SMA module, a frequency converter, and a second power amplifier module;

[0021] The filtering module is connected to the first SMA module and the second SMA module;

[0022] The first SMA module is connected to the first power amplifier module;

[0023] The second SMA module, the frequency converter, and the second power amplifier module are connected in sequence.

[0024] A method for an unmanned aerial vehicle (UAV)-borne multi-mode wideband radar analog electronic target is implemented based on the described UAV-borne multi-mode wideband radar analog electronic target system, and includes the steps:

[0025] S1: Enter the main program and perform system initialization through the platform control module;

[0026] S2: Enter the mode selection. If the transparent transmission mode is selected, go to step S3; if the transmit switch mode is selected, go to step S4; if the waveform generation mode is selected, go to step S5;

[0027] S3: Enable the communication between the ZYNQ signal processing module and the ADRV9009 radio frequency transceiver module, and return to step S2;

[0028] S4: The ZYNQ signal processing module transmits the transmit switch status instruction to the transmit switch, and return to step S2;

[0029] S5: Generate radar agile signals, radar pulse repetition frequency (PRF) signals, and radar intra-pulse modulation signals through the radar signal generation module, and transmit the radar agile signals, radar PRF signals, and radar intra-pulse modulation signals through the ADRV9009 radio frequency transceiver module and the transmitting module, then return to step S2.

[0030] Preferably, the generation process of the radar agile signal is as follows:

[0031] Set the key parameter set, including: center frequency RF, signal instantaneous bandwidth Bw, and the number of agility N;

[0032] Calculate the frequency sequence through the key parameter set, and the expression is:

[0033]

[0034] where F i is the i-th frequency in the frequency sequence;

[0035] Generate the PRI values of each frequency;

[0036] If the increasing mode is selected, the radar agile signal is the PRI values arranged in ascending order of frequency;

[0037] If the decreasing mode is selected, the radar agile signal is the PRI values arranged in descending order of frequency;

[0038] If the random mode is selected, the radar agile signal is the randomly arranged PRI values.

[0039] Preferably, the generation process of the radar PRF signal is as follows:

[0040] Calculate the reference PRF value and the PRF difference between each frequency through the PRI values of each frequency;

[0041] If the staggered mode is selected, the radar PRF signal is the reference PRF value and each PRF difference arranged in ascending order, descending order, or randomly;

[0042] If the jitter mode is selected, adjust the reference PRF value based on the jitter percentage to obtain the jitter PRF value, and the radar PRF signal is the jitter PRF value and each PRF difference arranged in ascending order, descending order, or randomly;

[0043] If the sliding mode is selected, generate a PRF sequence through ascending order or descending order according to the sliding step and ratio, and the radar PRF signal is the PRF sequence.

[0044] Preferably, the generation process of the radar intra-pulse modulation signal is as follows:

[0045] Generate a frequency modulation signal through linear frequency modulation and generate a phase coding signal through phase coding;

[0046] The in-pulse modulation signal of the radar is a frequency modulation signal or a phase-coded signal.

[0047] Preferably, the radar agile signal, the radar PRF signal, and the radar in-pulse modulation signal are transmitted through the ADRV9009 radio frequency transceiver module and the transmitting module. Specifically:

[0048] If multi-signal transmission is selected, the radar agile signal, the radar PRF signal, and the radar in-pulse modulation signal are superimposed to obtain a superimposed signal; after the superimposed signal passes through the ADRV9009 radio frequency transceiver module and the transmitting module in sequence, it is divided into two paths for signal transmission;

[0049] If multi-signal transmission is not selected, the radar agile signal, the radar PRF signal, and the radar in-pulse modulation signal are each independently transmitted through the ADRV9009 radio frequency transceiver module and the transmitting module in sequence, and then divided into two paths for signal transmission.

[0050] The present invention has the following beneficial effects:

[0051] Based on the ZYNQ signal processing module and the ADRV9009 radio frequency transceiver module as the hardware foundation, and the multi-mode radar simulation as the software architecture, various radar waveforms are generated and adjusted according to the key characteristic indexes of the radar, supporting inter-pulse characteristics, in-pulse characteristics, and frequency tuning, and accurately simulating radar signals in a complex electromagnetic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural diagram of an unmanned aerial vehicle (UAV)-borne multi-mode broadband radar simulation electronic target system;

[0053] Figure 2 It is a flowchart of a method for an unmanned aerial vehicle (UAV)-borne multi-mode broadband radar simulation electronic target;

[0054] Figure 3 It is a flowchart for generating the radar agile signal;

[0055] Figure 4 It is a flowchart for generating the radar PRF signal;

[0056] Figure 5 It is a flowchart for generating the radar in-pulse modulation signal;

[0057] Figure 6 It is a schematic diagram of the frequency difference and bandwidth between adjacent peak-to-peak values of frequency agility;

[0058] Figure 7 It is a schematic diagram of the frequency difference and bandwidth between adjacent peak-to-peak values of frequency diversity;

[0059] The realization, functional characteristics, and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0060] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] The present invention provides an airborne multi-mode wideband radar simulation electronic target system for unmanned aerial vehicles, which includes a host computer, a ZYNQ signal processing module, an ADRV9009 radio frequency transceiver module, and a transmitting module connected in sequence.

[0062] Specifically, the airborne multi-mode wideband radar simulation electronic target system for unmanned aerial vehicles adopts a modular design, and its overall architecture is as Figure 1 shown, and it is mainly composed of two core modules: a ZYNQ signal processing module and an ADRV9009 radio frequency transceiver module. The system can simulate the inter-pulse characteristics (such as pulse repetition frequency, pulse width, etc.) and intra-pulse characteristics (such as linear frequency modulation, phase coding, etc.) of different types of radar signals, and realize the signal transmission of multi-mode radar signal modes by designing algorithms. By using an unmanned aerial vehicle as a carrier for radar countermeasure drills, it can not only flexibly simulate the multi-dimensional positions of real battlefield targets, but also greatly improve the effectiveness and authenticity of countermeasure training.

[0063] As an embodiment:

[0064] The ZYNQ signal processing module includes: a processor and a programmable logic module;

[0065] The processor includes a radar signal generation module, an internal interconnection module, and a platform control module;

[0066] The programmable logic module includes: a baseband processing module and a data interface;

[0067] The platform control module is connected to the host computer through a network interface;

[0068] The platform control module, the radar signal generation module, the internal interconnection module, the baseband processing module, and the data interface are connected in sequence.

[0069] Specifically, in the system architecture, the ZYNQ signal processing module serves as an algorithm development platform, and its Processor System (PS) module is responsible for executing the initialization and control functions of the radio frequency module. After the system completes initialization, it performs corresponding operations according to different instructions, among which radar signal generation is the most core functional module. When the system receives the radar parameters sent by the host computer through the network interface, it immediately starts the radar signal generation module to generate corresponding IQ data. These data are transmitted to the PL side through the high-speed interconnection channel between the PS and the Programmable Logic (PL). The PL side is responsible for performing high-speed parallel processing on the IQ data and transmitting the processed data to the ADRV9009 radio frequency chip through the JESD204B protocol.

[0070] As an embodiment:

[0071] The radar signal generation module includes: a frequency agility feature module, a pulse repetition frequency (PRF) feature module, and an in-pulse feature module;

[0072] The frequency agility feature module is used to generate radar frequency agility signals, the PRF feature module is used to generate radar PRF signals, and the in-pulse feature module is used to generate radar in-pulse modulation signals.

[0073] As an embodiment:

[0074] The ADRV9009 radio frequency transceiver module includes: a local oscillator switching module, a transmit switch, a filtering module, a mixing module, a gain control module, and a digital-to-analog conversion module;

[0075] The platform control module is connected to the local oscillator switching module and the transmit switch through the SPI interface and the GPIO interface;

[0076] The data interface is connected to the digital-to-analog conversion module through the JESD204B interface;

[0077] The digital-to-analog conversion module, the gain control module, the mixing module, and the filtering module are connected in sequence.

[0078] Specifically, the ADRV9009 radio frequency transceiver module adopts a dual-channel architecture, supports a maximum sampling rate of 491.52 Msps, has an adjustable transmit bandwidth of 400 MHz, and a frequency tuning range covering 75 MHz to 6000 MHz. As the radio frequency transmit front-end of the radar waveform simulation electronic target, this chip mainly undertakes the conversion and transmission functions from the baseband signal to the radio frequency signal. After filtering processing, the signal is divided into two paths through a broadband balun: one path is directly output to the power amplifier; the other path converts the 0.75 - 6 GHz signal to a 6 - 18 GHz high-frequency signal through a frequency converter and then outputs it to the power amplifier.

[0079] As an embodiment:

[0080] The transmitting module includes: a first SMA module, a first power amplifier module, a second SMA module, a frequency converter, and a second power amplifier module;

[0081] The filtering module is connected to the first SMA module and the second SMA module;

[0082] The first SMA module is connected to the first power amplifier module;

[0083] The second SMA module, the frequency converter, and the second power amplifier module are connected in sequence.

[0084] A method for an unmanned aerial vehicle (UAV)-borne multi-mode wideband radar simulation electronic target is implemented based on the described UAV-borne multi-mode wideband radar simulation electronic target system, and includes the steps:

[0085] S1: Enter the main program and perform system initialization through the platform control module;

[0086] S2: Enter the mode selection. If the transparent transmission mode is selected, go to step S3; if the transmit switch mode is selected, go to step S4; if the waveform generation mode is selected, go to step S5;

[0087] S3: Enable the communication between the ZYNQ signal processing module and the ADRV9009 radio frequency transceiver module, and return to step S2;

[0088] S4: The ZYNQ signal processing module transmits the transmit switch status instruction to the transmit switch, and return to step S2;

[0089] S5: Generate a radar agile signal, a radar pulse repetition frequency (PRF) signal, and a radar pulse internal modulation signal through the radar signal generation module, and transmit the radar agile signal, the radar PRF signal, and the radar pulse internal modulation signal through the ADRV9009 radio frequency transceiver module and the transmitting module, and return to step S2.

[0090] Specifically, the implementation process of the core algorithm of the radar target is as Figure 2 shown. Its main program algorithm design starts from system initialization and then enters the mode selection stage. The program operation mainly includes three modes: transparent transmission mode, transmit switch mode, and waveform generation mode. In the transparent transmission mode, the system forwards the data sent by the host computer to the serial port or GPIO port in a specific format; in the transmit switch mode, the system controls the transmit switch status according to the host computer instruction; in the waveform generation mode, the system receives the radar parameters transmitted by the host computer (such as pulse repetition interval PRI, pulse width PW, instantaneous bandwidth, operating frequency, etc.), generates radar signals and outputs waveforms. In addition, the system will judge whether multi-signal superposition processing is required: if no superposition is required, the signal will be directly transmitted; if superposition is required, multiple radar signals will be synthesized and then transmitted.

[0091] As an embodiment:

[0092] The generation process of the radar agile signal is as follows:

[0093] Set a set of key parameters, including: center frequency RF, signal instantaneous bandwidth Bw, and number of agile changes N;

[0094] Calculate the frequency sequence through the set of key parameters, and the expression is:

[0095]

[0096] where F i is the i-th frequency in the frequency sequence;

[0097] Generate the PRI value of each frequency;

[0098] If the increasing mode is selected, the radar agile signal is the PRI values arranged in ascending order of frequency;

[0099] If the decreasing mode is selected, the radar agile signal is the PRI values arranged in descending order of frequency;

[0100] If the random mode is selected, the radar agile signal is the randomly arranged PRI values.

[0101] Specifically, Figure 3 A method for generating a radar agile signal is given. Its design is based on three key parameters: center frequency (RF), signal instantaneous bandwidth (Bw), and number of agile changes (N) set by the master computer. Calculate the basic frequency sequence through the above formula and support three agile modes: increasing, decreasing, and random. In the increasing mode, the frequency increases in order, in the decreasing mode, the frequency changes from high to low, and in the random mode, the frequency is selected through a random permutation function. The system generates the corresponding pulse repetition interval (PRI) sequence according to the number of frequencies, and generates the corresponding frequency in each PRI according to the selected agile mode, realizing flexible frequency agile control. Generate a specific pulse repetition interval list according to the set parameters to achieve different radar emission characteristics.

[0102] As an embodiment:

[0103] The generation process of the radar PRF signal is as follows:

[0104] Calculate the reference PRI value and the PRI difference between each frequency through the PRI value of each frequency;

[0105] If the staggering mode is selected, the radar PRF signal is the reference PRI value and each PRI difference sorted in ascending order, descending order, or randomly;

[0106] If the dither mode is selected, the reference PRI value is adjusted based on the dither percentage to obtain the dither PRI value, and the radar PRF signal is the dither PRI value and each PRI difference sorted in ascending order, descending order, or randomly;

[0107] If the sliding mode is selected, a PRI sequence is generated by sorting in ascending or descending order according to the sliding step and ratio, and the radar PRF signal is the PRI sequence.

[0108] Specifically, Figure 4 A method for generating a radar PRF signal is given, which includes three modes: staggering, dithering, and sliding. The staggering mode is calculated based on the maximum PRI difference and the reference PRI, and supports ascending, descending, and random arrangements; the dithering mode adjusts the reference PRI based on the dither percentage and also supports three change methods; the sliding mode generates a PRI sequence in ascending or descending mode according to the sliding step and ratio. Each mode can generate a specific list of pulse repetition intervals according to the set parameters to achieve different radar transmission characteristics.

[0109] As an embodiment:

[0110] The generation process of the radar intra-pulse modulation signal is as follows:

[0111] A frequency modulation signal is generated by linear frequency modulation, and a phase-coded signal is generated by phase coding;

[0112] The radar intra-pulse modulation signal is a frequency modulation signal or a phase-coded signal.

[0113] Specifically, Figure 5 A method for generating a radar intra-pulse modulation signal is given, which includes two methods: linear frequency modulation and phase coding. Linear frequency modulation determines the frequency modulation slope by setting the bandwidth and pulse width to generate an instantaneous frequency signal that changes with time. Phase coding supports binary, quaternary, and octal codes, and generates a coded signal by setting the symbol parameters and random phase values. Both methods are finally converted into I / Q signals and output radio frequency signals after digital-to-analog conversion.

[0114] As an embodiment:

[0115] The radar agile signal, radar PRF signal, and radar intra-pulse modulation signal are transmitted through the ADRV9009 radio frequency transceiver module and the transmitting module. Specifically:

[0116] If multi-signal transmission is selected, the radar agile signal, radar PRF signal, and radar intra-pulse modulation signal are superimposed to obtain a superimposed signal; after the superimposed signal passes through the ADRV9009 radio frequency transceiver module and the transmitting module in sequence, it is divided into two paths for signal transmission;

[0117] If multi-signal transmission is not selected, the radar agile signal, radar PRF signal, and radar intra-pulse modulation signal are each independently and sequentially passed through the ADRV9009 radio frequency transceiver module and the transmission module, and then divided into two paths for signal transmission.

[0118] Experimental results:

[0119] Build the overall experimental test framework. Divide the radio frequency signal output by the electronic target into two paths. One path is directly input into the power splitter through a radio frequency cable, and the other path is input into the power splitter after passing through a frequency converter. Finally, according to the test requirements, connect the signal to a spectrum analyzer or an oscilloscope.

[0120] Two different radar radio frequency signals, namely frequency agility and frequency diversity, are used in the experiment as the transmitted signals to verify the effectiveness of the designed broadband radar waveform for the frequency agility function of the simulated electronic target. During the test, the instantaneous bandwidths of the frequency agility and frequency diversity signals are both set to 400 MHz, and the number of agility and diversity is also set to 11. Finally, read the bandwidth of each signal through the measurement function of the spectrum analyzer to complete the verification.

[0121] Take the frequency difference between the peak-to-peak values at the farthest two ends of frequency agility and frequency diversity as the bandwidth. The frequency difference and bandwidth between adjacent peak-to-peak values of frequency agility are as Figure 6 shown. It can be seen from the data in the figure that the measured bandwidth between two adjacent peak-to-peak values of the agility signal is 39.674667 MHz, which is 0.325333 MHz different from the theoretical value of 40 MHz, and the error is 0.813%. The measured bandwidth of frequency agility is 399.514667 MHz, which is 0.485333 MHz different from the set bandwidth, and the error is 0.121%. The frequency difference and bandwidth between adjacent peak-to-peak values of frequency diversity are as Figure 7 shown. It can be seen from the data in the figure that the measured bandwidth between two adjacent peak-to-peak values of the diversity signal is 40.376163 MHz, which is 0.376163 MHz different from the theoretical value of 40 MHz, and the error is 0.940%. The measured bandwidth of frequency diversity is 399.803183 MHz, which is 0.196817 MHz different from the set bandwidth, and the error is 0.049%. Generally speaking, the frequency agility distribution can reach 400 MHz, meeting the design requirements of the wide frequency band of the electronic target.

[0122] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also other elements not explicitly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0123] The serial numbers of the embodiments of the present invention above are for description only and do not represent the superiority or inferiority of the embodiments. In the unit claims listing several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not denote any order and these words may be construed as identifiers.

[0124] The above are only the preferred embodiments of the present invention and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included within the patent protection scope of the present invention.

Claims

1. An unmanned aerial vehicle (UAV)-borne multi-mode wideband radar simulation electronic target system, characterized in that It includes a host computer, a ZYNQ signal processing module, an ADRV9009 radio frequency transceiver module, and a transmitting module that are connected in sequence.

2. The airborne multi-mode wideband radar analog electronic target system according to claim 1, characterized in that: The ZYNQ signal processing module includes: a processor and a programmable logic module; The processor includes a radar signal generation module, an internal interconnection module, and a platform control module; The programmable logic module includes: a baseband processing module and a data interface; The platform control module is connected to the host computer through a network interface; The platform control module, the radar signal generation module, the internal interconnection module, the baseband processing module, and the data interface are connected in sequence.

3. The airborne multi-mode wideband radar analog electronic target system according to claim 2, characterized in that: The radar signal generation module includes: a frequency agility feature module, a pulse repetition frequency (PRF) feature module, and an in-pulse feature module; The frequency agility feature module is used to generate radar frequency agility signals, the PRF feature module is used to generate radar PRF signals, and the in-pulse feature module is used to generate radar in-pulse modulation signals.

4. The airborne multi-mode wideband radar analog electronic target system according to claim 2, characterized in that: The ADRV9009 radio frequency transceiver module includes: a local oscillator switching module, a transmit switch, a filtering module, a mixing module, a gain control module, and a digital-to-analog conversion module; The platform control module is connected to the local oscillator switching module and the transmit switch through an SPI interface and a GPIO interface; The data interface is connected to the digital-to-analog conversion module through a JESD204B interface; The digital-to-analog conversion module, the gain control module, the mixing module, and the filtering module are connected in sequence.

5. The airborne multi-mode wideband radar analog electronic target system according to claim 4, characterized in that: The transmitting module includes: a first SMA module, a first power amplifier module, a second SMA module, a frequency converter, and a second power amplifier module; The filtering module is connected to the first SMA module and the second SMA module; The first SMA module is connected to the first power amplifier module; The second SMA module, the frequency converter, and the second power amplifier module are connected in sequence.

6. A method for simulating an electronic target for an unmanned aerial vehicle (UAV)-borne multi-mode wideband radar, which is implemented based on the UAV-borne multi-mode wideband radar simulation electronic target system according to any one of claims 1-5, characterized in that, It includes the steps of: S1: Enter the main program and perform system initialization through the platform control module; S2: Enter the mode selection. If the transparent transmission mode is selected, go to step S3; if the transmit switch mode is selected, go to step S4; if the waveform generation mode is selected, go to step S5; S3: Enable the communication between the ZYNQ signal processing module and the ADRV9009 radio frequency transceiver module, and return to step S2; S4: The ZYNQ signal processing module transmits the transmit switch status instruction to the transmit switch, and return to step S2; S5: Generate radar frequency agility signals, radar PRF signals, and radar in-pulse modulation signals through the radar signal generation module, and transmit the radar frequency agility signals, radar PRF signals, and radar in-pulse modulation signals through the ADRV9009 radio frequency transceiver module and the transmitting module, and return to step S2.

7. The method for simulating an electronic target for an unmanned aerial vehicle (UAV)-borne multi-mode broadband radar according to claim 6, wherein The generation process of the radar frequency agility signal is: Set a set of key parameters, including: center frequency RF, signal instantaneous bandwidth Bw, and the number of frequency agility N; Calculate the frequency sequence through the set of key parameters, and the expression is: where F i is the i-th frequency in the frequency sequence; Generate the PRI values for each frequency; If the increasing mode is selected, the radar agile signal is the PRI values arranged in ascending order of frequency; If the decreasing mode is selected, the radar agile signal is the PRI values arranged in descending order of frequency; If the random mode is selected, the radar agile signal is the randomly arranged PRI values.

8. The method for simulating an electronic target for an airborne multi-mode broadband radar according to claim 7, characterized in that, The generation process of the radar PRF signal is as follows: Calculate the reference PRI value and the PRI difference between each frequency through the PRI values of each frequency; If the staggered mode is selected, the radar PRF signal is the reference PRI value and each PRI difference arranged in ascending order, descending order or randomly; If the jitter mode is selected, adjust the reference PRI value based on the jitter percentage to obtain the jitter PRI value. The radar PRF signal is the jitter PRI value and each PRI difference arranged in ascending order, descending order or randomly; If the sliding mode is selected, generate a PRI sequence by ascending order or descending order according to the sliding step and ratio. The radar PRF signal is the PRI sequence.

9. The method for simulating an electronic target for an airborne multi-mode wideband radar for an unmanned aerial vehicle according to claim 6, characterized in that, The generation process of the radar intra-pulse modulation signal is as follows: Generate a frequency modulation signal through linear frequency modulation and generate a phase coding signal through phase coding; The radar intra-pulse modulation signal is a frequency modulation signal or a phase coding signal.

10. The method for simulating an electronic target for an airborne multi-mode broadband radar for drones according to claim 6, characterized in that Transmit the radar agile signal, the radar PRF signal and the radar intra-pulse modulation signal through the ADRV9009 radio frequency transceiver module and the transmitting module. Specifically: If multi-signal transmission is selected, superimpose the radar agile signal, the radar PRF signal and the radar intra-pulse modulation signal to obtain a superimposed signal; after passing the superimposed signal through the ADRV9009 radio frequency transceiver module and the transmitting module in sequence, divide it into two paths for signal transmission; If multi-signal transmission is not selected, transmit the radar agile signal, the radar PRF signal and the radar intra-pulse modulation signal independently through the ADRV9009 radio frequency transceiver module and the transmitting module in sequence, and divide it into two paths for signal transmission.

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