Multi-mode broadband communication analog electronic target system and algorithm for unmanned aerial vehicle

Abstract

The invention discloses an unmanned aerial vehicle-oriented multimode broadband communication analog electronic target system in the technical field of electronic countermeasure and communication systems, and the system comprises a ZYNQ signal processing development board which immediately starts a communication signal generation module after the system receives communication parameters issued by an upper computer through a network interface, generates corresponding IQ data, and transmits the IQ data to a communication module; iQ data is transmitted to the PL end through a high-speed interconnection channel between the PS end and the PL end, and the PL end is responsible for performing high-speed parallel processing on the IQ data and transmitting the processed data to the ADRV9009 radio frequency transceiving front end; the ADRV9009 radio frequency transceiving front end adopts a dual-channel architecture and is used for converting and transmitting a baseband signal to a radio frequency signal, and after filtering processing, the signal is divided into two paths for output through a broadband balun: one path is directly output to a power amplifier and then is sent out through an antenna; and the other path is converted into a high-frequency signal through the frequency converter, then is output to the power amplifier and is sent out through the antenna. According to the invention, the targets of low power consumption, small size and high integration level are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic countermeasure and communication systems, and particularly to an analog electronic target system and algorithm. Background Art

[0002] Communication modules carried by drones (such as 4G / 5G, Wi-Fi, satellite communication) have been widely used in data transmission, each with its own characteristics: 4G / 5G provides high bandwidth and low latency, Wi-Fi has flexible deployment but limited range, and satellite communication has wide coverage but high cost. The electronic target system provides a simulation environment for training and testing by simulating the RF signals and infrared characteristics of targets, but there is still room for improvement in simulating complex dynamic targets. The multi-mode wideband communication terminal supports automatic switching of multiple communication modes, enhancing the adaptability of the system, but multi-mode integration and wideband signal processing still face challenges such as interference and compatibility. Some existing inventions have combined drones with electronic targets, such as dynamic electronic target systems and signal processing technologies based on software radio, demonstrating the innovation potential in this field. However, there is still room for innovation in the design of an airborne analog electronic target system for multi-mode wideband communication, especially in aspects such as seamless integration of multi-mode communication, efficient processing of wideband signals, and intelligent simulation of dynamic targets. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides an airborne analog electronic target system and algorithm for multi-mode wideband communication, achieving the goals of low power consumption, small volume, and high integration; by integrating multi-mode communication technologies through algorithms, the communication stability is significantly improved, and the wideband signal processing ability is optimized; in addition, by introducing airborne technology, high-fidelity target simulation is achieved, not only reducing the system cost and deployment difficulty, but also enhancing the dynamic simulation authenticity and environmental adaptability of the electronic target; this design provides efficient and intelligent technical support for fields such as military training and test evaluation.

[0004] The object of the present invention is achieved as follows: An airborne analog electronic target system for multi-mode wideband communication, comprising: A ZYNQ signal processing development board, as an algorithm development platform, whose PS side is responsible for executing the initialization and control functions of the RF module. After the system completes initialization, it performs corresponding operations according to different instructions. It has a built-in communication signal generation module. When the system receives communication parameters sent by the host computer through the network interface, it immediately starts the communication signal generation module to generate corresponding IQ data. The IQ data is transmitted to the PL side through the high-speed interconnection channel between the PS side and the PL side. The PL side is responsible for performing high-speed parallel processing on the IQ data and transmitting the processed data to the ADRV9009 RF transceiver front end; The ADRV9009 radio frequency transceiver front-end adopts a dual-channel architecture to convert and transmit baseband signals to radio frequency signals. After filtering, the signal is divided into two paths by a broadband balun: one path is directly output to a power amplifier and then sent out through an antenna; the other path is converted into a high-frequency signal by a frequency converter and then output to a power amplifier and sent out through an antenna.

[0005] An algorithm for an unmanned aerial vehicle (UAV)-borne multi-mode broadband communication analog electronic target, which adopts a system for an unmanned aerial vehicle (UAV)-borne multi-mode broadband communication analog electronic target, includes the following steps: Step 1) The system initialization starts, and then enters the mode selection phase; Step 2) 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 and returns to the mode selection phase; In the transmit switch mode, the system controls the state of the transmit switch according to the host computer instruction and returns to the mode selection phase; In the waveform generation mode, the system receives the communication parameters transmitted by the host computer and sends them to the communication signal generation module; Step 3) Perform analog modulation and digital modulation in the communication signal generation module; Step 4) After the communication signal generation module generates a communication signal, the system will determine whether multi-signal superposition processing is required: if no superposition is required, the signal will be directly transmitted; if superposition is required, multiple communication signals will be synthesized and then transmitted.

[0006] Further, the analog modulation in step 3) specifically includes: Step a) Perform basic parameter settings, including carrier frequency, modulation frequency, and modulation parameters; Step b) Select the modulation mode according to the preset, including AM amplitude modulation, FM frequency modulation, USB upper sideband modulation, LSB lower sideband modulation, and DSB double sideband modulation; After the mode is selected, perform IQ quadrature modulation to convert the modulation signal into the form of an IQ signal; Step d) Output the modulated signal for use or testing by the subsequent communication system.

[0007] Further, the digital modulation in step 3) specifically includes: Step a) Basic parameter settings, including carrier frequency, modulation frequency, and modulation bit rate; Step b) Select the digital modulation mode according to the requirement, including 2ASK, 2FSK, BPSK, QPSK; Step c) After the mode is selected, perform IQ modulation to convert the signal into the form of an IQ signal; Step d) Output the modulated signal for the test and application of subsequent communication systems.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: With the present invention, various communication signal waveforms can be flexibly generated and adjusted. The system has high-precision signal simulation, wide-band processing, high dynamic performance, and low-power design, supports the generation and processing of various communication signals (such as AM, FM, QPSK, etc.), and accurately simulates communication signals in complex electromagnetic environments. By using an unmanned aerial vehicle as a carrier for communication countermeasure drills, not only can the multi-dimensional positions and communication behaviors of real targets be dynamically simulated, but also the effectiveness and authenticity of countermeasure training can be significantly improved, providing a highly simulated actual combat environment for military training and test evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0010] Figure 1 It is the overall architecture diagram of the present invention.

[0011] Figure 2 It is the algorithm flowchart of the present invention.

[0012] Figure 3 It is the flowchart of the method for generating simulated modulation signals in the present invention.

[0013] Figure 4 It is the flowchart of the method for generating digital modulation signals in the present invention.

[0014] Figure 5 It is the test framework built in the embodiment of the present invention.

[0015] Figure 6 It is the time-domain diagram of the AM signal in the present invention.

[0016] Figure 7 It is the frequency-domain diagram of the AM signal in the present invention.

[0017] Figure 8 It is the time-domain diagram of the ASK signal in the present invention.

[0018] Figure 9 It is the frequency-domain diagram of the ASK signal in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] The multi-mode wideband communication analog electronic target system for unmanned aerial vehicle (UAV) carried in the present invention adopts a modular design, and its overall architecture is as Figure 1 shown. It mainly consists of two core modules: the ZYNQ signal processing development board and the ADRV9009 radio frequency transceiver front end. In the system architecture, the ZYNQ signal processing development board 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, and the communication signal generation is the most core functional module. When the system receives the communication parameters sent by the host computer through the network interface, it immediately starts the communication 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.

[0021] The ADRV9009 radio frequency transceiver chip 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 analog 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.

[0022] The implementation process of the multi-mode wideband communication analog electronic target system for UAV carried in the present invention is as Figure 2As 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 state of the transmit switch according to the host computer instruction; in the waveform generation mode, the system receives the communication parameters transmitted by the host computer (such as modulation information type, modulation method type, signal bandwidth, operating frequency, etc.), generates a communication signal and outputs a waveform. In addition, the system will judge whether multi-signal superposition processing is required: if no superposition is needed, the signal will be directly transmitted; if superposition is needed, multiple communication signals will be synthesized and then transmitted.

[0023] Figure 3 The generation method of the analog modulation signal is given. In the starting stage, basic parameter settings are first carried out, including carrier frequency, modulation frequency, and modulation parameters (such as modulation degree or frequency deviation, etc.). Subsequently, the modulation mode is selected according to the preset, and various methods such as AM amplitude modulation, FM frequency modulation, USB upper sideband modulation, LSB lower sideband modulation, and DSB double sideband modulation are supported. After the selected mode, IQ quadrature modulation is carried out to convert the modulation signal into the form of IQ signal. Finally, the modulated signal is output for the use or test of the subsequent communication system.

[0024] Figure 4 The generation method of the digital modulation signal is given. In the starting stage, basic parameter settings are first carried out, including carrier frequency, modulation frequency, and modulation bit rate (Rb). Subsequently, the digital modulation mode is selected according to the requirement, and various modulation methods such as 2ASK, 2FSK, BPSK, QPSK, etc. are supported. After the selected mode, IQ modulation is carried out to convert the signal into the form of IQ signal for further processing. Finally, the modulated digital signal is output for the test and application of the communication system.

[0025] The present invention will be further described below in conjunction with specific examples.

[0026] Press Figure 5 As shown, the overall experimental test framework is built. The radio frequency signal output by the electronic target is divided into two paths. One path is directly input into the power divider through a radio frequency cable, and the other path is input into the power divider after passing through a frequency converter. Finally, according to the test requirements, the signal is connected to a spectrum analyzer or an oscilloscope.

[0027] Two different communication radio frequency signals were selected for the experiment, namely amplitude modulation (AM) in analog modulation and amplitude shift keying (ASK) in digital modulation, as the transmitted signals, to verify the effectiveness of the designed broadband communication waveform for the emission function of the analog electronic target. During the test, the modulation signal type of the AM signal was set as a single-tone signal, the modulation frequency was 100 KHz, and the carrier frequency was 500 MHz; the ASK symbol was a 01 sequence, the signal bandwidth was 80 KHz, and the carrier frequency was 500 MHz. Finally, these two signals were read through the measurement functions of an oscilloscope and a spectrum analyzer to complete the verification.

[0028] The time domain of the set AM signal is as shown in Figure 6 the figure, and the frequency domain is as shown in Figure 7 the figure. It can be seen from the data in the figure that the bandwidth between the left adjacent peaks of the measured AM signal is 101.333 kHz, which is 1.333 kHz different from the theoretical value of 100 kHz, and the error is 1.333%; the bandwidth between the right adjacent peaks is 100 kHz, which is consistent with the theoretical value; the center frequency is 499.876 MHz, which is 0.124 MHz different from the theoretical value of 500 MHz, and the error is 0.0248%. Generally speaking, the measured value is basically consistent with the theoretical value, meeting the emission requirements of the AM signal.

[0029] The time domain of the set ASK signal is as shown in Figure 8 the figure, and the frequency domain is as shown in Figure 9 the figure. Taking the nearest value, it can be seen from the data in the figure that the bandwidth between the left adjacent peaks of the measured ASK signal is 101.333 kHz, which is 1.333 kHz different from the theoretical value of 100 kHz, and the error is 1.333%; the center frequency is 499.979529 MHz, which is 0.020471 MHz different from the theoretical value of 500 MHz, and the error is 0.0040942%. Generally speaking, the measured value is basically consistent with the theoretical value, meeting the emission requirements of the ASK signal.

[0030] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A multi-mode broadband communication analog electronic target system for unmanned aerial vehicles, characterized in that: include: ZYNQ signal processing development board, as an algorithm development platform, its PS end is responsible for executing the initialization and control functions of the RF module. After the system is initialized, it performs corresponding operations according to different instructions. It has a built-in communication signal generation module. When the system receives the communication parameters sent by the host computer through the network interface, it immediately starts the communication signal generation module to generate corresponding IQ data. The IQ data is transmitted to the PL end through the high-speed interconnection channel between the PS end and the PL end. The PL end is responsible for high-speed parallel processing of the IQ data and transmits the processed data to the ADRV9009 RF transceiver front end; The ADRV9009 RF transceiver front end adopts a dual-channel architecture to convert and transmit baseband signals to RF signals. After filtering, the signal is divided into two outputs through a broadband balun: one is directly output to the power amplifier and then sent out through the antenna; the other is converted into a high-frequency signal through a frequency converter and then output to the power amplifier and then sent out through the antenna.

2. An algorithm for simulating electronic targets for multi-mode broadband communications onboard unmanned aerial vehicles, using a system for simulating electronic targets for multi-mode broadband communications onboard unmanned aerial vehicles, characterized in that: The following steps are involved: Step 1) System initialization begins, followed by the mode selection phase; Step 2) The program operation mainly includes three modes: transparent transmission mode, transmission switch mode and waveform generation mode; In transparent transmission mode, the system forwards the data sent by the host computer to the serial port or GPIO port in a specific format and returns to the mode selection stage; In the transmitting switch mode, the system controls the transmitting switch state according to the host computer command and returns to the mode selection stage; In the waveform generation mode, the system receives the communication parameters transmitted by the host computer and sends them to the communication signal generation module; Step 3) performing analog modulation and digital modulation in the communication signal generation module; Step 4) After the communication signal generation module generates the communication signal, the system will determine whether multi-signal superposition processing is required: if superposition is not required, the signal is transmitted directly; if superposition is required, multiple communication signals are synthesized and then transmitted.

3. The electronic target simulation algorithm for multi-mode broadband communication onboard unmanned aerial vehicles according to claim 2 is characterized in that: The analog modulation in step 3) specifically includes: Step a) setting basic parameters, including carrier frequency, modulation frequency and modulation parameters; Step b) selecting a modulation mode according to a preset, including AM amplitude modulation, FM frequency modulation, USB upper sideband modulation, LSB lower sideband modulation and DSB double sideband modulation; Step c) After the mode is selected, IQ quadrature modulation is performed to convert the modulated signal into an IQ signal form; Step d) The modulated signal is output for use or testing of subsequent communication systems.

4. The electronic target simulation algorithm for multi-mode broadband communication onboard unmanned aerial vehicles according to claim 2 is characterized in that: The digital modulation in step 3) specifically includes: Step a) Basic parameter settings, including carrier frequency, modulation frequency and modulation bit rate; Step b) Select the digital modulation mode according to the requirements, including 2ASK, 2FSK, BPSK, QPSK; Step c) After the mode is selected, IQ modulation is performed to convert the signal into an IQ signal form; Step d) outputs the modulated signal for subsequent communication system testing and application.

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