Detection, identification and cooperative interference system and method for low-slow small target

Abstract

The invention discloses a detection, identification and cooperative interference system and method for a low, slow and small target, and the system comprises an antenna array, a power amplifier module, a digital module and a power module, and the digital module is integrated with a radio frequency channel assembly, a first signal processing assembly, a navigation interference assembly and a network data exchange assembly. Accurate identification, azimuth measurement and cooperative interference of low-speed small target signals can be realized; according to the method, on the basis of the system, through target signal receiving, processing, extraction, recognition, interference generation and navigation interference, full-process confrontation on the low-slow small target is achieved. The method has the advantages of being high in frequency band expansibility, high in recognition precision and good in interference collaboration, and can meet the requirements for detection, recognition and collaborative interference of low-speed and slow-speed small targets.

Description

Technical Field

[0001] This application relates to the fields of radio reconnaissance and jamming technology, and in particular to a system and method for detecting, identifying and coordinating jamming of low, slow and small targets. Background Technology

[0002] With the rapid development of the low-altitude economy, the application of low-altitude, slow-moving, and small targets is becoming increasingly widespread, but it also brings serious security risks. Existing countermeasures systems targeting low-altitude, slow-moving, and small targets have the following shortcomings: First, they have limited frequency band coverage, making it difficult to adapt to the communication and navigation frequency band requirements of different types of low-altitude, slow-moving, and small targets, resulting in poor scalability; second, their signal recognition accuracy is insufficient, making them susceptible to clutter interference and misjudgment, and they lack target azimuth measurement capabilities, affecting the targeting of jamming; third, their jamming methods are limited, mostly single-band suppression jamming, without forming a coordinated jamming mechanism for communication and navigation, resulting in limited countermeasures; fourth, the communication latency between system modules is high, coordination is poor, and it is difficult to respond quickly to dynamic targets. Therefore, developing a low-speed, small-target countermeasure system and method with scalable frequency bands, accurate identification, and strong collaborative interference capabilities has become an urgent need in the current security field. Summary of the Invention

[0003] The main objective of this application is to provide a detection, identification, and cooperative jamming system and method for low, slow, and small targets. It aims to solve the technical problems of limited frequency band coverage, low identification accuracy, and poor jamming coordination in existing low, slow, and small target detection, identification, and cooperative jamming systems, and to provide a cooperative countermeasure system and method with expandable frequency band, accurate identification, and both communication jamming and navigation deception capabilities.

[0004] This application provides a system and method for detecting, identifying, and coordinating the jamming of low, slow, and small targets, employing the following techniques: A system and method for detecting, identifying, and coordinating jamming of low-speed, small targets, comprising an antenna array, a power amplifier module, a digital module, and a power supply module: The antenna array is used to receive navigation signals and target signals, and to transmit jamming signals; The power amplifier module is used to receive navigation signals and target signals from the antenna array, filter the target signals, transmit them to the digital module, and amplify and filter the interference signals generated by the digital module before outputting them to the antenna array. The digital module is used to receive navigation signals and filtered target signals, and to perform feature recognition on the filtered target signals to generate corresponding interference signals. The power module is used to supply power to the antenna array, the power amplifier module and the digital module.

[0005] Optionally, the interference signal includes UAV target interference signal and navigation interference signal; the antenna array includes a first transceiver antenna and a second transceiver antenna; the first transceiver antenna includes a log-periodic antenna and a microstrip array antenna, and the second transceiver antenna includes a navigation receiving antenna and a navigation transmitting antenna, wherein: The log-periodic antenna is used to capture target signals in the 800MHz-960MHz and 2.4GHz range and radiate 50W-level UAV target jamming signals. The microstrip array antenna is used to receive target signals at 2.5 GHz, 5.8 GHz and 6 GHz, and radiates 60W-level UAV target jamming signals; The navigation receiving antenna is used to independently receive navigation signals; The navigation transmitting antenna is used to radiate 40W-level navigation interference signals.

[0006] Optionally, the power amplifier module includes a power filter, a power switch, and a power amplifier, wherein: The power filter is used to filter out externally received noise signals and some noise and harmonic signals output by the power amplifier. The power switch is used for target signal reception and interference switching; The power amplifier is used to amplify and output the interference signal generated by the digital module.

[0007] Optionally, the digital module includes a radio frequency channel component, a first signal processing component, a second signal processing component, a navigation jamming component, and a network data exchange component, wherein: The radio frequency channel component is used to receive and process target signals, and to process the UAV target interference signals generated by the first signal processing component and the second signal processing component; The first signal processing component is used to process the target signal and generate a UAV target jamming signal of the corresponding frequency; The second signal processing component is used to generate UAV target jamming signals in other frequency bands; The navigation jamming component is used to generate navigation jamming signals that deceive or interfere with the position of the UAV target. The network data exchange component is used for communication between the digital modules and for external communication.

[0008] Optionally, the radio frequency channel component includes a receive channel and a transmit channel: The receiving channel is used to receive the target signal and perform filtering and amplification; The transmission channel is used to amplify and filter the UAV target interference signals generated by the first signal processing component and the second signal processing component.

[0009] Optionally, the first signal processing component includes an analog-to-digital converter, an extraction and recognition unit, an interference generation unit, and a digital-to-analog converter, wherein: The analog-to-digital converter is used to perform analog-to-digital conversion on the target signal and output a digital signal; The extraction and recognition unit is used to decimate and filter the digital signal, extract the frequency domain information and power spectrum information of the filtered digital signal as target signal features; based on the target signal features and the UAV target signal features, target signal recognition is performed to obtain the recognition result, and target orientation measurement is performed. The interference generation unit is used to generate UAV target interference signals based on the characteristics of UAV target signals; The digital-to-analog converter is used to convert the target interference signal of the UAV into a digital-to-analog signal.

[0010] Optionally, the extraction and recognition unit extracts the frequency domain information and power spectrum information of the target signal through fast Fourier transform.

[0011] Optionally, the navigation jamming component includes an analog-to-digital converter, a demodulation unit, a jamming decision unit, a jamming waveform generation unit, and a digital-to-analog converter, wherein: The analog-to-digital converter is used to perform analog-to-digital conversion on the navigation signal and output the navigation digital signal to the demodulation unit; The demodulation unit is used to demodulate the navigation digital signal, extract information, and provide data guidance for the real-time generation of navigation interference signals. The interference decision unit is used to guide the generation of navigation interference signals based on the UAV deception strategy and the information extracted by the demodulation unit. The interference waveform generation unit is used to generate navigation interference signals and optimize the waveforms for navigation interference scenarios.

[0012] Optionally, the network data switching component is a multi-port gigabit switch.

[0013] Furthermore, to achieve the above objectives, this application also provides a detection, identification, and cooperative jamming system and method for low, slow, and small targets. The method is implemented based on the device described in any one of the above-mentioned methods and includes the following steps: S1, receiving target signals and navigation signals via an antenna array; S2, a power amplifier module receives the target signals and navigation signals transmitted by the antenna array, filters and amplifies the target signals, and transmits the navigation target signal and the processed target signal to a digital module; S3, the receiving channel of the radio frequency channel component in the digital module filters and amplifies the target signals, and transmits the processed target signals to a first signal processing component; S4, the first signal processing component performs analog-to-digital conversion on the processed target signals using an analog-to-digital converter, outputting a digital signal; the digital signal is sequentially decimated and filtered, and the filtered signal is extracted using a fast Fourier transform. The frequency domain information and power spectrum information of the digital signal are used as target signal features. A feature matching method is employed, combining the target signal features with the UAV target signal features, to identify the target signal and obtain the identification result. The target signal identified as a UAV target signal is then used for target orientation measurement. Based on the UAV target signal features and target orientation, a corresponding UAV target interference signal is generated. The UAV target interference signal is then converted from digital to analog by a digital-to-analog converter and output. S5: The first signal processing component establishes a communication connection with the second signal processing component to acquire frequency band guidance information and generate UAV target interference signals for other frequency bands. S6: The UAV target interference signal is filtered and amplified through the transmission channel of the RF channel component and output to the power amplifier module for further amplification and filtering. It is then radiated through the antenna to interfere with the UAV target signal. S7. The navigation receiving antenna receives the navigation signal and transmits it to the navigation jamming component. In the navigation jamming component, the analog-to-digital converter performs analog-to-digital conversion on the navigation signal and outputs it to the demodulation unit. The demodulation unit demodulates the navigation signal to provide data guidance for the real-time generation of the navigation jamming signal. The jamming decision unit guides the generation of the navigation jamming signal based on the UAV deception strategy and the demodulated data from the demodulation unit. The waveform generation unit generates the navigation baseband jamming signal and optimizes the waveform for the navigation jamming scenario to achieve synchronous deception and jamming of the real satellite navigation signal.

[0014] This application proposes a detection, identification, and coordinated jamming system and method for low-speed, small targets. The antenna array supports multiple frequency band configurations, making it widely applicable. The power amplifier module integrates a power filter to effectively filter out clutter and harmonic signals, improving the quality of received signals and the effectiveness of jamming signals. The digital module uses a first signal processing component to generate multi-band jamming signals, extracts signal features through a feature extraction unit, and combines the processing unit to achieve accurate target signal identification. It also has the capability to measure target azimuth, improving the targeting of jamming. The power supply module provides stable power to the antenna array, power amplifier module, and digital module, ensuring continuous system operation. Attached Figure Description

[0015] Figure 1 A schematic diagram illustrating the principle of a detection, identification, and cooperative jamming system and method for low, slow, and small targets, provided in an embodiment of this application. Figure 2 This is a time-spectrum diagram of a target signal of a certain UAV according to an embodiment of this application; Figure 3 This is a demodulation constellation diagram of a certain UAV according to an embodiment of this application; Figure 4 This is a comparison diagram of demodulated data before and after navigation interference according to an embodiment of this application; Figure 5 This is a real-time generated image of navigation interference signals according to an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application.

[0016] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] The main solution in this application embodiment is: A system and method for detecting, identifying, and coordinating jamming of low-speed, small targets, comprising an antenna array, a power amplifier module, a digital module, and a power supply module: The antenna array is used to receive navigation signals and target signals, and to transmit jamming signals; The power amplifier module is used to receive navigation signals and target signals from the antenna array, filter the target signals, transmit them to the digital module, and amplify and filter the interference signals generated by the digital module before outputting them to the antenna array. The digital module is used to receive navigation signals and filtered target signals, identify the filtered target signals, and generate interference signals. The power module is used to supply power to the antenna array, the power amplifier module and the digital module.

[0018] This application provides a detection, identification, and coordinated jamming system and method for low, slow, and small targets. The detection, identification, and jamming functions are highly integrated into the system, shortening the system response time. The antenna array supports N frequency band configurations, covering the operating frequency bands of UAVs. By extracting signal features through the extraction and identification unit, the system can accurately identify target signals, improving the system's jamming targeting.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can understand it.

[0020] refer to Figure 1 One embodiment of this application provides a detection, identification, and coordinated jamming system for low-speed, small targets. The system includes an antenna array, a power amplifier module, a digital module, and a power supply module. The power amplifier module includes a power filter, a power switch, and a power amplifier. The digital module includes a radio frequency channel component, a first signal processing component, a second signal processing component, a navigation jamming component, and a network data exchange component. The radio frequency channel component includes a receiving channel and a transmitting channel. The first signal processing component includes an analog-to-digital converter, an extraction and identification unit, an interference generation unit, and a digital-to-analog converter. The navigation jamming component includes an analog-to-digital converter, a demodulation unit, an interference decision unit, an interference waveform generation unit, and a digital-to-analog converter.

[0021] The connections between the modules are as follows: the antenna array is connected to the power amplifier module via an RF interface or a 50Ω RF cable; the power amplifier module is connected to the RF channel component in the digital module via an RF interface or a 50Ω RF cable; the transmitting channel is connected to the analog-to-digital converter via a serial interface, and the receiving channel is connected to the digital-to-analog converter via a serial interface; the first signal processing component is connected to the second signal processing component via two AXI4-Stream high-speed parallel interfaces, the first signal processing component is connected to the navigation jamming component via an AXI4-Stream interface, and the first signal processing component is connected to the network data exchange component via a Gigabit Ethernet interface; the second signal processing component is connected to the network data exchange component via a Gigabit Ethernet interface; the navigation receiving antenna is connected to the analog-to-digital converter, the analog-to-digital converter is connected to the adjustment unit, the adjustment unit is connected to the jamming decision unit via a UART interface, and the jamming decision unit is connected to the waveform generation unit via a parallel data bus.

[0022] In one specific embodiment, the antenna array employs eight independent antenna elements, divided into a first transceiver antenna and a second transceiver antenna, covering the needs of all scenarios. The first transceiver antenna includes a log-periodic antenna and a microstrip array antenna. The log-periodic antenna operates in a wide frequency band of 800MHz to 2500MHz, covering the 800MHz-960MHz civilian communication supplementary frequency, the 1.8GHz 4G frequency band, and the 2400-2483.5MHz mainstream drone communication frequency band, adapting to low-frequency drones and clutter signal reception. The microstrip array antenna operates in a wide frequency band of 2000MHz to 6000MHz, covering the 5G frequency band, the 5725-5875MHz drone communication frequency band, and the 6GHz emerging drone frequency band, supporting multi-band parallel detection and interference. The second transceiver antenna includes a navigation receiving antenna and a navigation transmitting antenna. The navigation receiving antenna is a right-hand circularly polarized helical antenna used to receive navigation signals from GPS L1, L2, BDSB1, B2 and GLONASS G1, providing high-precision spatiotemporal reference and ephemeris information for navigation interference. The navigation transmitting antenna is a right-hand circularly polarized patch antenna, with its operating frequency band covering major satellite navigation frequencies, such as 1176MHz, 1227MHz, 1575MHz and 1561MHz, used to radiate generated navigation interference signals.

[0023] The system comprises eight independent antenna elements: two log-periodic antennas, four microstrip array antennas, two navigation receiving antennas, and two navigation transmitting antennas. These elements are connected to the power amplifier module via an RF network and integrated into a conformal radome with a low radar cross-section, mounted on a motorized, liftable mast. All antennas utilize SMA-J type RF interfaces.

[0024] Two log-periodic antennas continuously scan the low-frequency band signals within the coverage area, four microstrip array antennas receive UAV signals in the mid-to-high frequency band of 2000MHz to 6000MHz, and the navigation receiving antenna independently receives space satellite navigation signals. All receiving antennas transmit the sensed radio frequency signals to the receiving input of the power amplifier module through the SMA-J interface.

[0025] The antenna array receives the interference signal amplified by the power amplifier after being received by the digital module, and distributes it to the corresponding antenna unit according to the frequency band: the 800MHz~2500MHz antenna radiates the 50W level UAV target interference signal to the target direction, the 2000MHz~6000MHz antenna radiates the 60W level UAV target interference signal, and the navigation transmission antenna radiates the 40W level navigation interference signal. The power amplifier module includes a power filter, a power switch, and a power amplifier. The power filter is used to filter out externally received clutter signals and some clutter and harmonic signals output by the power amplifier. The power switch is used for switching between target signal reception and interference. The power amplifier is used to amplify and output the interference signals generated by the digital module. The power amplifier module is responsible for receiving the radio frequency signals transmitted by the antenna array and amplifying the interference signals generated by the digital module. The power amplifier module has a receive mode and a transmit mode.

[0026] In one specific embodiment, the power filter employs a multi-band compatible LC filter array, with filter branches designed for the 800MHz–2500MHz, 2000MHz–6000MHz, and 1.5GHz navigation frequency bands respectively; the power switch is the Qorvo GaN switching device QPA2620, operating in the DC–6GHz frequency band; the power amplifier adopts a frequency-division amplification architecture, with three independent power amplifiers designed for the three frequency bands of the antenna array. 800MHz~2500MHz power amplifier: Avago's ATF-55143 is used for the preamplifier and Cree's CGH40006 is used for the power amplifier, with a typical output power of 50W. 2000MHz~6000MHz power amplifier: Mini-Circuits ERA-3SM+ is selected for the preamplifier, and Cree CGH40010 is selected for the power amplifier, with a typical output power of 60W. 1.5GHz navigation amplifier: Qorvo's QPA9980 is selected, with a typical output power of 40W; In one specific embodiment, the power amplifier module's receiving mode workflow is as follows: The digital module outputs a TTL high-level control signal via the FPGA to trigger the Qorvo QPA2620 power switch to switch to the receiving channel. The RF signals received by the eight antennas are respectively connected to the power filters of the corresponding frequency bands. The multi-band compatible LC filter array filters the signals according to the frequency band: the 800MHz~2500MHz signals are filtered by the corresponding branch, and the 2000MHz~6000MHz and 1.5GHz signals are filtered by the dedicated branch to remove mains noise and external electromagnetic interference. The filtered clean signal is transmitted to the receiving channel of the RF channel component of the digital module through the MCX RF interface.

[0027] The power amplifier module's transmit mode workflow is as follows: The 0dBm~10dBm interference signal generated by the digital module is amplified by the RF channel component's transmit channel and then transmitted to the transmit input of the power amplifier module. The FPGA outputs a TTL low-level control signal, the power switch switches to the transmit channel, and the interference signal is distributed to three independent power amplifiers according to frequency band. The 800MHz to 2500MHz UAV target jamming signal enters a power amplifier combination consisting of Avago ATF-55143 and Cree CGH40006, and is amplified to 50W through two stages; The 2000MHz to 6000MHz UAV target interference signal enters the power amplifier combination composed of Mini-Circuits ERA-3SM+ and Cree CGH40010, and is amplified to 60W; The 1.5GHz navigation interference signal enters Qorvo's QPA9980 power amplifier and is amplified to 40W; The amplified interference signal is then filtered again by a multi-band compatible LC filter array in the power filter to remove harmonic noise, and then radiated out through the antenna array.

[0028] The digital module is used to receive and identify target signals, and generate interference signals for target signals identified as UAV target signals. The digital module includes a radio frequency channel component, a first signal processing component, a navigation interference component, and a network data exchange component. The radio frequency channel component includes a receiving channel and a transmitting channel; the first signal processing component includes an analog-to-digital converter, an extraction and identification unit, an interference generation unit, and a digital-to-analog converter; the navigation interference component includes an analog-to-digital converter, an adjustment unit, an interference decision unit, an interference waveform generation unit, and a digital-to-analog converter.

[0029] The receiving channel is used to receive the target signal transmitted by the power amplifier module and amplify and filter it; the transmitting channel is used to drive and amplify the UAV target interference signal generated by the first signal processing component and the second signal processing component.

[0030] In one specific embodiment, the RF channel component comprises six independent receiving channels: two corresponding to 800MHz–2500MHz, three corresponding to 2000MHz–6000MHz, and one corresponding to navigation reception. Each channel uses an ADI AD8361 RF front-end chip with an adjustable gain range of 30–60dB. The transmitting channel also comprises six independent transmitting channels: two corresponding to 800MHz–2500MHz, three corresponding to 2000MHz–6000MHz, and one corresponding to navigation transmission. Each channel uses a TI LMX2594 phase-locked loop chip and a broadband power amplifier module. Both the receiving and transmitting channels use MCX RF interfaces and are connected to the power amplifier module via 50Ω RF cables. A new RF switching control interface is added, which is linked to the power switch of the power amplifier module to achieve matching between the antenna, channel, and frequency band.

[0031] The digital-to-analog converter (DAC) is used to perform analog-to-digital conversion on the target signal and output a digital signal. The extraction and recognition unit is used to decimate and filter the digital signal output by the DAC, and extract the frequency domain information and power spectrum information of the filtered digital signal through fast Fourier transform as target signal features. Combining the target signal features with the UAV target signal features, target signal recognition is performed to obtain the recognition result. For the target signal that the recognition result is a UAV target signal, the target azimuth is measured. The interference decision unit is used to generate a corresponding UAV target interference signal based on the UAV target signal features and the target azimuth. The DAC is used to convert the UAV target interference signal from a digital quantity to an analog quantity and output it.

[0032] In one specific embodiment, the analog-to-digital converter (ADC) in the first signal processing component is the AD9680 from Analog Devices, which supports parallel acquisition of 6 receiving channel signals; the digital-to-analog converter (DAC) is the DAC38J84 from Texas Instruments, which supports parallel generation of 6 transmitting channel signals.

[0033] refer to Figure 2 , Figure 3 In the first signal processing component, the AD9680 performs analog-to-digital conversion on the target signal at a sampling rate of 1.25 GSps. The digital signal undergoes decimation and low-pass filtering: an FIR low-pass filter with a cutoff frequency of 156.25 MHz and a filter order of 64 is used to filter out high-frequency noise and image interference above 156.25 MHz, avoiding aliasing distortion during decimation. The filtered signal is then decimated at a ratio of one valid point for every four sampling points, reducing the downsampling rate from 1.25 GSps to 312.5 MSps, thus reducing the amount of data for subsequent signal processing. The processed 312.5 MSps digital signal is transmitted to the processing unit via the AXI4-Stream interface. This process reduces DSP computation while preserving the target signal characteristics through precise filtering, providing data for subsequent identification.

[0034] The extraction and recognition unit mainly consists of an FPGA and a DSP. The FPGA is a Xilinx Kintex UltraScale, and the DSP is a TI TMS320C6678. The Fast Fourier Transform (FFT) algorithm is one of the methods in time-domain to frequency-domain transform analysis. In the extraction and recognition unit, the FPGA calls the FFT algorithm to perform frequency domain analysis on the filtered signal, extracting frequency domain information including the center frequency and bandwidth, as well as power spectrum information including power peak and spectral shape characteristics, as features of the target signal. The Euclidean distance matching algorithm is a classification and matching algorithm used in signal recognition, image processing, and pattern recognition. It determines the matching degree by calculating the Euclidean distance between two feature vectors. A digital signal processor (DSP) calls upon a multi-band feature library covering UAV signal characteristics from 800MHz to 6GHz and uses the Euclidean distance matching algorithm to analyze the signal: the extracted target signal features are compared with the UAV signal features in the library. If the matching degree is ≥95%, the signal is determined to be a UAV target signal; if the matching degree is <95%, it is determined to be clutter and discarded.

[0035] Minimum Variance Distortionless Response (MVDR) beamforming is an adaptive spatial filtering algorithm that minimizes the total power of the array output while ensuring distortion-free reception of the target direction signal, thereby achieving maximum suppression of interference and noise and accurately estimating the target's azimuth information. For signal segments identified as targets, the FPGA calculates the target's azimuth and elevation angles using the MVDR beamforming algorithm, binds the calculated target azimuth data with the identification results, and transmits it to the network data exchange component via the AXI4-Stream interface. The network data exchange component then uploads the data to an external server and simultaneously feeds it back to the navigation jamming component.

[0036] The DSP generates interference signals for the corresponding frequency band based on the frequency band and modulation characteristics of the target signal. For example, it uses co-frequency suppression interference for continuous wave remote control signals, frequency sweep interference for FM image transmission signals, and noise modulation interference for digital modulation signals. The digital interference signals are converted into analog signals by TI's DAC38J84 and output to the RF channel transmission channel.

[0037] The second signal processing component is used to generate interference signals in other frequency bands. The configuration of the second signal processing component is the same as that of the first signal processing component. Through the collaborative operation of FPGA and DSP, the precise complementarity of multi-frequency interference signals is achieved.

[0038] In one specific embodiment, the second signal processing component establishes communication with the first signal processing component through two AXI4-Stream interfaces of the FPGA. One interface transmits target core information, such as frequency band, modulation method, power, azimuth angle, and timestamp; the other interface transmits interference parameter configuration instructions, such as interference type, bandwidth ratio, and power level. After extracting the valid information, the FPGA stores it in 2GB DDR4 SDRAM. The DSP automatically matches extended frequency bands according to the target main frequency band transmitted by the first signal processing component: if the target main frequency band is 800MHz to 2500MHz, it generates 1-2 spare frequency bands within 2000MHz to 6000MHz to prevent UAV frequency band switching; if the target main frequency band is 2000MHz to 6000MHz, it generates frequency bands within 800MHz to 2500MHz and adjacent frequency bands to achieve full frequency band coverage.

[0039] The second signal processing component operates with the same interference type logic as the first signal processing component, synchronously generating complementary interference: when the primary interference is co-frequency suppression, the second signal processing component generates frequency-sweeping interference to cover adjacent frequency bands; when the primary interference is frequency-sweeping interference, the second signal processing component generates noise-modulated interference to specifically suppress the digital image transmission signal. The DSP dynamically allocates the interference power of the second signal processing component based on the target azimuth angle and transmission distance, combined with the power configuration of the first signal processing component, to generate the interference signal.

[0040] The generated interference signal is transmitted to the transmission channel of the radio frequency channel component and outputs in coordination with the interference signal of the first signal processing component to achieve multi-band parallel interference.

[0041] The demodulation unit is used to demodulate space satellite navigation signals, extract information, and provide data guidance for the real-time generation of navigation interference signals; the interference decision unit is used to guide the generation of navigation interference signals based on UAV deception strategies and the information extracted after demodulation; the interference waveform generation unit is used to generate navigation interference signals and optimize waveforms for navigation interference scenarios.

[0042] In one specific embodiment, the demodulation unit in the navigation jamming component uses a NEO-M9N series GNSS module manufactured by u-blox. It communicates with the jamming decision unit via a UART interface, receiving navigation signals transmitted from the antenna array and providing data guidance for the real-time generation of navigation jamming signals. The jamming decision unit uses an STM32H743ZI microcontroller, generating false navigation data based on a strategy of deviating from the target area, thus achieving real-time generation of navigation jamming signals; it also adaptively adjusts the transmission power according to the radiation range of the navigation transmitting antenna. The jamming waveform generation unit generates a baseband signal that optimizes the jamming waveform for the navigation jamming signal, and then modulates the baseband signal to different carrier frequencies to achieve precise modulation of the navigation frequency band, supporting parallel deception waveform generation of GPS, BeiDou, GLONASS, and Galileo signals.

[0043] The specific working process of the navigation interference component is as follows: Navigation signal reception and parsing: The demodulation unit u-blox NEO-M9N GNSS module demodulates the input signal, supports parallel reception of GPS, BeiDou, GLONASS and Galileo satellite navigation signals, and parses satellite ephemeris, timestamp, pseudorange and carrier phase data, which are then transmitted to the control unit via the UART interface to complete navigation signal reception and parsing.

[0044] Deception Strategy Generation: The interference decision unit generates false navigation data based on a strategy deviating from the target area, achieving real-time generation of navigation interference signals. Based on the target azimuth measurement results, the transmission power is adaptively adjusted using a multi-antenna power allocation algorithm. The generated false navigation data based on the strategy deviating from the target area is as follows: Position offset: Set a false position according to the application scenario. The offset is 600-800m for airport protection scenarios and 500-1000m for border protection scenarios. The position error is ≤5m. Speed ​​adaptation: Set a false speed according to the drone type. The false speed for consumer drones is ≤15m / s, and for industrial drones it is ≤30m / s. The deviation from the actual speed of the target is ≤2m / s to avoid triggering drone navigation abnormality alarms. Time synchronization: Based on the GNSS 1PPS signal, the false timestamp is calibrated with a deviation of ≤1μs from the real satellite time to ensure the consistency of navigation interference signal timing.

[0045] The adaptive adjustment of transmit power by the multi-antenna power allocation algorithm is as follows: For distances ≤2km: Transmission power 10-20W, navigation interference signal strength is 10-15dB higher than the actual satellite signal; At a distance of 2-4km: the transmission power is 20-30W, and the navigation interference signal strength is 8-12dB higher than the real signal; Distance > 4km: Transmit power 30-40W, navigation interference signal strength is 6-10dB higher than the real signal.

[0046] Interference signal waveform generation: Reference Figure 5 The FPGA-based DDS generates navigation interference signals based on the control unit; the baseband signal is processed by a 32nd-order FIR interpolation filter, increasing the sampling rate from 312.5MSps to 1.25GSps, improving waveform smoothness, filtering out high-frequency noise in the baseband signal, and improving the quality of subsequent RF modulation; the optimized baseband signal is mixed with the carrier signal generated by the local oscillator to generate RF interference signals; the carrier frequency is calibrated through a phase-locked loop (PLL) to ensure alignment with the actual satellite signal frequency band.

[0047] Directional transmission of jamming signals: The navigation jamming signal is fed into a 1.5GHz dedicated power amplifier, Qorvo QPA9980, and amplified to 10~40W according to the configured power to avoid clutter interference with surrounding communication equipment. The amplified signal is then filtered again by a dedicated filter branch of the navigation transmitting antenna to ensure signal purity. The navigation transmitting antenna adjusts its radiation direction based on the target's azimuth and elevation angles via an electric angle adjustment mechanism to ensure that the navigation jamming signal accurately covers the airspace where the target UAV is located. The jamming decision unit receives target status updates from the first signal processing component in real time. If the target's position or velocity changes, it immediately adjusts the false navigation data and transmission power. By monitoring the reflection feedback of the navigation jamming signal, it calibrates the transmission power and beam direction to ensure that the navigation jamming signal continuously suppresses real satellite signals.

[0048] refer to Figure 4 When navigation interference is not performed, the data is clearly visible; when interference is implemented, the data can no longer be deciphered.

[0049] In one specific embodiment, the network data exchange component adopts a multi-port gigabit switch to realize communication between various components within the digital module, as well as communication between the system and external devices.

[0050] In one specific embodiment, the power module adopts a multi-stage conversion secondary power supply. First, the input AC power is converted into an intermediate DC bus voltage through a primary rectifier module, and then stable DC power of different voltage levels is output through multiple independent DC-DC secondary conversion modules to accurately power each module of the system.

[0051] This application provides a method for detecting, identifying, and coordinating interference with low-speed, small targets, implemented based on the aforementioned system, as detailed below: S1. Two log-periodic antennas in the antenna array continuously scan for low-frequency target signals within the coverage area. Four microstrip array antennas receive mid-to-high frequency target signals in the 2000MHz–6000MHz range. The navigation receiving antenna independently receives navigation signals. All receiving antennas transmit the sensed RF signals to the receiving input of the power amplifier module via the SMA-J interface. The antenna array receives interference signals amplified by the power amplifier after being processed by the digital module, and distributes them to the corresponding antenna elements according to frequency band.

[0052] S2. The power amplifier module receives the target signal from the drone. The power switch switches to the receiving channel. The RF signals received by the eight antennas are respectively connected to the power filters of the corresponding frequency bands. The signals are filtered according to the frequency band, and the filtered clean signals are transmitted to the receiving channel of the RF channel component of the digital module through the MCX RF interface. The interference signal generated by the digital module is amplified by the transmitting channel of the RF channel component and then transmitted to the transmitting input of the power amplifier module. The power switch switches to the transmitting channel, and the interference signal is distributed to three independent power amplifiers according to the frequency band for amplification. The amplified interference signal is filtered again by the power filter to remove harmonics and noise, and then radiated out through the antenna array.

[0053] S3. The receiving channel of the radio frequency channel component in the digital module amplifies and filters the target signal, and transmits the processed target signal to the first signal processing component. S4. The first signal processing component performs analog-to-digital conversion on the target signal received by the analog-to-digital converter; sequentially performs decimation and filtering processing on the digital signal output by the analog-to-digital converter; extracts the frequency domain information and power spectrum information of the filtered digital signal through fast Fourier transform as target signal features; analyzes and identifies the target signal features using feature matching method, compares the extracted target signal features with the UAV target signal features in the database, if the matching degree is ≥95%, it is determined to be a UAV target signal, and if the matching degree is <95%, it is determined to be a clutter signal and discarded; for the target signal identified as a UAV target signal, the target azimuth is measured through a multi-antenna beamforming algorithm; generates a corresponding UAV target interference signal based on the corresponding UAV target features, and then converts the UAV target interference signal from digital to analog output through a digital-to-analog converter.

[0054] S5. The second signal processing component establishes a communication connection with the first signal processing component, obtains target frequency band guidance information, and generates UAV target jamming signals in other frequency bands based on the guidance information. The generated UAV target jamming signals are transmitted to the transmission channel of the radio frequency channel component and output in coordination with the UAV target jamming signals of the first signal processing component.

[0055] S6. The UAV jamming signal is amplified through the transmission channel of the radio frequency channel component and output to the power amplifier module for further amplification. It is then radiated through the antenna to output the UAV jamming signal, thereby interfering with the UAV target signal.

[0056] S7. The navigation receiving antenna receives space satellite navigation signals and transmits them to the navigation jamming component. In the navigation jamming component, the analog-to-digital converter performs analog-to-digital conversion on the space satellite navigation signals and outputs the result to the demodulation unit. The demodulation unit demodulates the space satellite navigation signals to provide data guidance for the real-time generation of navigation jamming signals. The jamming decision unit generates navigation jamming signals based on the UAV deception strategy and the demodulated data from the demodulation unit. The jamming waveform generation unit generates a baseband signal with optimized jamming waveforms for the navigation jamming signals and then modulates the baseband signal to different carrier frequencies to achieve synchronous deception and jamming of real satellite navigation signals.

[0057] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 6 As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database is used for dynamic control data of iron trough water cooling intensity based on infrared temperature field reconstruction. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a detection, identification, and coordinated jamming system and method for low-speed, small targets.

[0058] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0059] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0060] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0061] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0062] It should be noted that the data involved in this application (including but not limited to UAV location data, GNSS data, identification results, etc.) are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0063] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (Read-Only Memory). Memory includes ROM, magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0064] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A system and method for detecting, identifying, and coordinating the interference of low-speed, small targets, characterized in that, Includes antenna array, power amplifier module, digital module and power supply module: The antenna array is used to receive navigation signals and target signals, and to transmit jamming signals; The power amplifier module is used to receive navigation signals and target signals from the antenna array, filter the target signals, transmit them to the digital module, and amplify and filter the interference signals generated by the digital module before outputting them to the antenna array. The digital module is used to receive navigation signals and filtered target signals, and to perform feature recognition on the filtered target signals to generate corresponding interference signals. The power module is used to supply power to the antenna array, the power amplifier module and the digital module.

2. The system according to claim 1, characterized in that, The interference signals include UAV target interference signals and navigation interference signals; the antenna array includes a first transceiver antenna and a second transceiver antenna; the first transceiver antenna includes a log-periodic antenna and a microstrip array antenna, and the second transceiver antenna includes a navigation receiving antenna and a navigation transmitting antenna, wherein: The log-periodic antenna is used to capture target signals in the 800MHz-960MHz and 2.4GHz range and radiate 50W-level UAV target jamming signals. The microstrip array antenna is used to receive target signals at 2.5 GHz, 5.8 GHz and 6 GHz, and radiates 60W-level UAV target jamming signals; The navigation receiving antenna is used to independently receive navigation signals; The navigation transmitting antenna is used to radiate 40W-level navigation interference signals.

3. The system according to claim 1, characterized in that, The power amplifier module includes a power filter, a power switch, and a power amplifier, wherein: The power filter is used to filter out externally received noise signals and some noise and harmonic signals output by the power amplifier. The power switch is used for target signal reception and interference switching; The power amplifier is used to amplify and output the interference signal generated by the digital module.

4. The system according to claim 1, characterized in that, The digital module includes a radio frequency channel component, a first signal processing component, a second signal processing component, a navigation jamming component, and a network data exchange component, wherein: The radio frequency channel component is used to receive and process target signals, and to process the UAV target interference signals generated by the first signal processing component and the second signal processing component; The first signal processing component is used to process the target signal and generate a UAV target jamming signal of the corresponding frequency; The second signal processing component is used to generate UAV target jamming signals in other frequency bands; The navigation jamming component is used to generate navigation jamming signals that deceive or interfere with the position of the UAV target. The network data exchange component is used for communication between the digital modules and for external communication.

5. The system according to claim 4, characterized in that, The radio frequency channel component includes a receive channel and a transmit channel: The receiving channel is used to receive the target signal and perform filtering and amplification; The transmission channel is used to amplify and filter the UAV target interference signals generated by the first signal processing component and the second signal processing component.

6. The system according to claim 4, characterized in that, The first signal processing component includes an analog-to-digital converter, an extraction and recognition unit, an interference generation unit, and a digital-to-analog converter, wherein: The analog-to-digital converter is used to perform analog-to-digital conversion on the target signal and output a digital signal; The extraction and recognition unit is used to decimate and filter the digital signal, extract the frequency domain information and power spectrum information of the filtered digital signal as target signal features; based on the target signal features and the UAV target signal features, target signal recognition is performed to obtain the recognition result, and target orientation measurement is performed. The interference generation unit is used to generate UAV target interference signals based on the characteristics of UAV target signals; The digital-to-analog converter is used to convert the target interference signal of the UAV into a digital-to-analog signal.

7. The system according to claim 6, characterized in that, The extraction and recognition unit extracts the frequency domain information and power spectrum information of the target signal through Fast Fourier Transform.

8. The system according to claim 4, characterized in that, The navigation jamming component includes an analog-to-digital converter, a demodulation unit, a jamming decision unit, a jamming waveform generation unit, and a digital-to-analog converter, wherein: The analog-to-digital converter is used to perform analog-to-digital conversion on the navigation signal and output the navigation digital signal to the demodulation unit; The demodulation unit is used to demodulate the navigation digital signal, extract information, and provide data guidance for the real-time generation of navigation interference signals. The interference decision unit is used to guide the generation of navigation interference signals based on the UAV deception strategy and the information extracted by the demodulation unit. The interference waveform generation unit is used to generate navigation interference signals and optimize the waveforms for navigation interference scenarios.

9. The system according to claim 4, characterized in that, The network data switching component is a multi-port gigabit switch.

10. A method for detecting, identifying, and coordinating interference with low-speed, small targets, characterized in that, The method is implemented based on the system described in any one of claims 1-9, and includes the following steps: S1. Receive target signals and navigation signals through the antenna array; S2. The power amplifier module receives the target signal and navigation signal transmitted by the antenna array, filters and amplifies the target signal, and transmits the navigation target signal and the processed target signal to the digital module. S3. The receiving channel of the radio frequency channel component in the digital module performs filtering and amplification processing on the target signal, and transmits the processed target signal to the first signal processing component. S4. The first signal processing component performs analog-to-digital conversion on the processed target signal using an analog-to-digital converter, outputting a digital signal. It then sequentially performs decimation and filtering on the digital signal, extracting the frequency domain and power spectrum information of the filtered digital signal using a fast Fourier transform, which serves as the target signal characteristics. A feature matching method is used to combine the target signal characteristics with the UAV target signal characteristics to perform target signal identification, obtaining the identification result. The target signal identified as a UAV target signal is then used for target orientation measurement. Based on the UAV target signal characteristics and target orientation, a corresponding UAV target interference signal is generated. Finally, the UAV target interference signal is converted from a digital quantity to an analog quantity using a digital-to-analog converter and output. S5. The first signal processing component establishes a communication connection with the second signal processing component, obtains frequency band guidance information, and generates UAV target jamming signals in other frequency bands. S6. The UAV target interference signal is filtered and amplified through the transmission channel of the radio frequency channel component, and then output to the power amplifier module for further amplification and filtering. It is then radiated through the antenna to interfere with the UAV target signal. S7. The navigation receiving antenna receives the navigation signal and transmits it to the navigation jamming component. In the navigation jamming component, the analog-to-digital converter performs analog-to-digital conversion on the navigation signal and outputs it to the demodulation unit. The demodulation unit demodulates the navigation signal to provide data guidance for the real-time generation of the navigation jamming signal. The jamming decision unit guides the generation of the navigation jamming signal based on the UAV deception strategy and the demodulated data from the demodulation unit. The waveform generation unit generates the navigation baseband jamming signal and optimizes the waveform for the navigation jamming scenario to achieve synchronous deception and jamming of the real satellite navigation signal.

Images