Single-bit composite interference generation method for radar

Abstract

The invention discloses a single-bit composite interference generation method for a radar, and the method comprises the steps: generating a digital orthogonal linear frequency modulation signal based on a direct digital frequency synthesis technology module, and correspondingly generating a linear frequency modulation signal, thereby generating a radar signal, and carrying out the signal transmission process of the radar; obtaining first user setting, selecting target threshold data, and carrying out single-bit sampling quantization on the radar signal to obtain a plurality of single-bit data so as to carry out a single-bit interception process; obtaining a second user setting, selecting a target interference modulation mode, and performing interference modulation on all single-bit data to obtain a composite interference modulation signal; and outputting the composite interference modulation signal according to the digital signal output setting and the analog signal output setting so as to carry out an interference forwarding process. According to the method, single-bit interception can be carried out on radar signals, rapid composite interference modulation can be completed, and interference countermeasure on a pulse compression system radar device is completed in combination with verification of a semi-physical device.

Description

Technical Field

[0001] The present invention relates to the field of signal processing technology, and in particular to a method, device, terminal and computer-readable storage medium for generating single-bit composite interference for radar. Background Art

[0002] Traditional radar jammers typically use high-precision, high-sampling-rate ADCs to sample and quantize radar transmission signals. They then process the received radar signals through complex jamming modulation algorithms to achieve deception and suppression of radar detection devices. Currently, single-bit jamming techniques can be used to implement radar suppression and deception jamming solutions.

[0003] However, the current radar jamming field mainly relies on simulation verification and lacks the limitation of device-level engineering implementation. It remains at the simulation level, making it difficult to evaluate and promote its feasibility and practicality in real jamming applications. It is impossible to verify the jamming countermeasures of pulse compression radar devices, making it difficult to advance to actual engineering applications.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] The main purpose of the present invention is to provide a single-bit composite interference generation method, device, terminal and computer-readable storage medium for radar, aiming to solve the limitations of the existing technology in the field of radar interference, which mainly relies on simulation verification and lacks device-level engineering implementation. It remains at the simulation level, making it difficult to evaluate and promote its feasibility and practicality in real interference applications, and unable to verify the interference countermeasures of pulse compression radar devices, making it difficult to advance to actual engineering applications.

[0006] To achieve the above object, the present invention provides a method for generating single-bit composite interference for radar, the method comprising the following steps:

[0007] Based on the direct digital frequency synthesis technology module, a digital orthogonal linear frequency modulation signal is generated, and according to the pre-set configuration parameters, a linear frequency modulation signal is generated, and a radar signal is generated according to the linear frequency modulation signal;

[0008] obtaining a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data;

[0009] Obtaining a second user setting, selecting a target interference modulation mode according to the second user setting, and performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal;

[0010] The composite interference modulated signal is output according to the digital signal output setting and the analog signal output setting.

[0011] Optionally, the direct digital frequency synthesis technology module is used to generate a digital orthogonal linear frequency modulation signal, and according to preset configuration parameters, a linear frequency modulation signal is generated, and the radar signal is generated according to the linear frequency modulation signal, specifically including:

[0012] Generate digital orthogonal linear frequency modulation signals based on direct digital frequency synthesis technology module;

[0013] Presetting configuration parameters, and calculating the phase increment according to the pre-set configuration parameters;

[0014] generating the linear frequency modulation signal according to the phase increment and the digital quadrature linear frequency modulation signal;

[0015] The linear frequency modulation signal is processed based on a digital-to-analog converter to obtain the radar signal.

[0016] Optionally, the acquiring a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data further includes:

[0017] Pre-set single-frequency signal threshold data, triangle wave threshold data, sawtooth wave threshold data and square wave threshold data;

[0018] The single-frequency signal threshold data, the triangle wave threshold data, the sawtooth wave threshold data, and the square wave threshold data are stored in four read-only memories respectively.

[0019] Optionally, acquiring a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data specifically includes:

[0020] Obtaining a first user setting, obtaining target threshold data from the four read-only memories according to the first user setting, and converting the target threshold data into an analog signal according to a digital-to-analog converter;

[0021] Comparing the radar signal with the target threshold data based on a high-speed comparator, determining and converting the radar signal into a logic value of 1 when the radar signal is greater than the target threshold data, and determining and converting the radar signal into a logic value of 0 when the radar signal is not greater than the target threshold data;

[0022] Obtain a third user setting, select a target sampling mode from an intermittent sampling mode and a continuous sampling mode according to the third user setting, and sample and quantize the radar signal after determination and processing by the high-speed comparator according to the target sampling mode to obtain multiple single-bit data.

[0023] Optionally, acquiring a second user setting, selecting a target interference modulation mode according to the second user setting, and performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0024] Acquire a second user setting, and select a target interference modulation mode from range-directed false target interference modulation and noise convolution interference modulation according to the second user setting;

[0025] All single-bit data are interference modulated according to the target interference modulation mode to obtain a composite interference modulation signal.

[0026] Optionally, performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0027] When the target interference modulation mode is range-directed false target interference modulation, a plurality of frequency-shift modulation signal data are obtained;

[0028] Perform a logical XOR operation on each of the single bits and the sign bit of the corresponding frequency-shift modulated signal data to generate a target sign bit, and splice each of the target sign bits with the data bit of the current frequency-shift modulated signal data to obtain a corresponding composite interference modulation signal.

[0029] Optionally, performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0030] When the target interference modulation mode is noise convolution interference modulation, obtaining a plurality of preset Gaussian white noise data;

[0031] Based on two buffers, all single-bit data are aligned with the preset Gaussian white noise data;

[0032] Performing a single-bit multiplication operation on each single-bit data and the corresponding Gaussian white noise data, and accumulating the result into an accumulator;

[0033] When the single-bit multiplication operation is completed on all single-bit data and the corresponding Gaussian white noise data, a composite interference modulation signal is output according to the accumulator.

[0034] In addition, to achieve the above-mentioned object, the present invention further provides a single-bit composite interference generation device for radar, wherein the single-bit composite interference generation device for radar includes:

[0035] A radar signal generation module is used to generate a digital orthogonal linear frequency modulation signal based on a direct digital frequency synthesis technology module, and to generate a linear frequency modulation signal according to preset configuration parameters, and to generate a radar signal according to the linear frequency modulation signal;

[0036] a single-bit data sampling module, configured to obtain a first user setting, select target threshold data according to the first user setting, and perform single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data;

[0037] an interference modulation module, configured to obtain a second user setting, select a target interference modulation mode according to the second user setting, and perform interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal;

[0038] The composite interference modulated signal forwarding module is used to output the composite interference modulated signal according to the digital signal output setting and the analog signal output setting.

[0039] In addition, to achieve the above-mentioned purpose, the present invention also provides a terminal, wherein the terminal includes: a memory, a processor, and a single-bit composite interference generation program for radar stored on the memory and runnable on the processor, wherein the single-bit composite interference generation program for radar, when executed by the processor, implements the steps of the single-bit composite interference generation method for radar as described above.

[0040] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a single-bit composite interference generation program for radar, and when the single-bit composite interference generation program for radar is executed by a processor, the steps of the single-bit composite interference generation method for radar as described above are implemented.

[0041] In the present invention, based on the direct digital frequency synthesis technology module, a digital orthogonal linear frequency modulation signal is generated, and according to pre-set configuration parameters, a linear frequency modulation signal is generated, and a radar signal is generated according to the linear frequency modulation signal; a first user setting is obtained, target threshold data is selected according to the first user setting, and single-bit sampling and quantization of the radar signal is performed according to the target threshold data to obtain multiple single-bit data; a second user setting is obtained, a target interference modulation mode is selected according to the second user setting, and all single-bit data are interference modulated according to the target interference modulation mode to obtain a composite interference modulation signal; and the composite interference modulation signal is output according to the digital signal output setting and the analog signal output setting. The present invention implements a corresponding single-bit composite interference generation method for radar on a Field-Programmable Gate Array (FPGA) platform. Through the single-bit composite interference generation method for radar, it is possible to sample radar transmission signals in real time, generate multiple quantization thresholds in real time, and perform single-bit quantization processing, while simultaneously completing rapid interference modulation to achieve multiple interference effects such as range deception interference, convolution noise interference, and intermittent sampling interference. The present invention is also verified based on a semi-physical device and can effectively evaluate the performance of the single-bit interference method under actual engineering devices, overcoming the limitation of the prior art that only stays at the simulation level. The method has the advantages of high processing speed, simple structure, and strong scalability, and can achieve interference countermeasures against pulse compression radar devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a flow chart of a preferred embodiment of the single-bit composite interference generation method for radar of the present invention;

[0043] Figure 2 This is a flow chart of single-bit sampling and quantization in a single-bit composite interference generation method for radar according to the present invention;

[0044] Figure 3 This is a flow chart of the interference modulation of a false target in a single-bit composite interference generation method for radar according to the present invention;

[0045] Figure 4 This is a flow chart of noise convolution interference in the single-bit composite interference generation method for radar according to the present invention;

[0046] Figure 5 It is the result of the range-toward false target interference pulse compression based on different thresholds in the single-bit composite interference generation method for radar of the present invention;

[0047] Figure 6 It is the range-directed false target jamming pulse compression result based on different thresholds and intermittent sampling in the single-bit composite jamming generation method for radar of the present invention;

[0048] Figure 7 It is the noise convolution interference pulse compression result based on different thresholds in the single-bit composite interference generation method for radar of the present invention;

[0049] Figure 8 This is a structural diagram of a preferred embodiment of a single-bit composite interference generating device for radar according to the present invention;

[0050] Figure 9 This is a structural diagram of another preferred embodiment of a single-bit composite interference generating device for radar according to the present invention;

[0051] Figure 10 FIG. 4 is a structural diagram of a preferred embodiment of the terminal of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clear and distinct, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] Traditional radar jammers typically use high-precision, high-sampling-rate ADCs to sample and quantize radar transmission signals. They then process the received radar signals using complex jamming modulation algorithms to achieve deception and suppression of radar detection devices. However, these jamming systems typically rely on high-resolution, wide-dynamic-range signal reception and processing modules, resulting in hardware implementation challenges such as high complexity, high power consumption, and high cost. Furthermore, they can suffer from latency issues in high-real-time scenarios. Single-bit quantization can be effectively applied in radar jamming systems. By retaining only the signal's sign bit, the jammer can significantly reduce system hardware complexity while preserving the signal's key characteristics. Applying single-bit quantization technology to radar jamming can overcome the traditional jamming system's reliance on high-precision sampling and high-complexity calculations, enabling more efficient and diverse jamming strategies. This means that single-bit jamming technology can now be used to implement both radar suppression and radar deception jamming schemes.

[0054] However, the current radar jamming field mainly relies on simulation verification and lacks the limitation of device-level engineering implementation. It remains at the simulation level, making it difficult to evaluate and promote its feasibility and practicality in real jamming applications. It is impossible to verify the jamming countermeasures of pulse compression radar devices, making it difficult to advance to actual engineering applications.

[0055] In response to one or more of the above problems, the present invention generates a digital orthogonal linear frequency modulation signal based on a direct digital frequency synthesis technology module, and generates a linear frequency modulation signal according to pre-set configuration parameters, and generates a radar signal based on the linear frequency modulation signal; obtains a first user setting, selects target threshold data according to the first user setting, and performs single-bit sampling and quantization on the radar signal according to the target threshold data to obtain multiple single-bit data; obtains a second user setting, selects a target interference modulation mode according to the second user setting, and performs interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal; and outputs the composite interference modulation signal according to the digital signal output setting and the analog signal output setting.

[0056] The single-bit composite interference generation method for radar described in the preferred embodiment of the present invention is as follows: Figure 1 As shown, the method for generating single-bit composite interference for radar includes the following steps:

[0057] Step S10: Generate a digital orthogonal linear frequency modulation signal based on the direct digital frequency synthesis technology module, generate a linear frequency modulation signal according to preset configuration parameters, and generate a radar signal according to the linear frequency modulation signal.

[0058] Specifically, this paper designs and implements the hardware for a radar-targeted single-bit composite jammer generation method based on single-bit jamming technology on a field-programmable gate array (FPGA) platform. This platform boasts powerful parallel processing capabilities and highly flexible hardware programmability, enabling real-time processing of high-throughput data streams. The platform also boasts highly flexible hardware resource configuration, enabling rapid adjustments to processing flows and logical structures based on different jamming strategies, adapting to the real-time generation requirements of various jamming patterns.

[0059] The FPGA is equipped with various physical devices, including a DDS (Direct Digital Synthesis) module, a DAC (Digital to Analog Converter), a FIFO (First Input First Output), a ROM (Read-Only Memory), and a RAM (Random Access Memory). These devices are used to implement the method of the present invention.

[0060] Furthermore, the direct digital frequency synthesis technology module generates a digital orthogonal linear frequency modulation signal, generates a linear frequency modulation signal according to preset configuration parameters, and generates a radar signal according to the linear frequency modulation signal, specifically including:

[0061] Generate digital orthogonal linear frequency modulation signals based on direct digital frequency synthesis technology module;

[0062] Presetting configuration parameters, and calculating the phase increment according to the pre-set configuration parameters;

[0063] generating the linear frequency modulation signal according to the phase increment and the digital quadrature linear frequency modulation signal;

[0064] The linear frequency modulation signal is processed based on a digital-to-analog converter to obtain the radar signal.

[0065] Specifically, in the present invention, the radar signal generation module is implemented based on a separate FPGA. In the present invention, the bandwidth, center frequency, and pulse duration parameters of the LFM (Linear Frequency Modulation) signal are first configured, and then the corresponding phase increment Δθ is calculated based on the set parameters. A DDS module is used within the corresponding FPGA to generate a digital orthogonal linear frequency modulation signal (including real and imaginary parts). The DDS module continuously accumulates phase values through a phase accumulator and realizes a linear change in output frequency over time based on the set phase increment Δθ, thereby generating a linear frequency modulation signal. The generated linear frequency modulation expression is shown in the following equation (1):

[0066]

[0067] Among them, T r is the pulse duration, f c is the center frequency, k r is the modulation frequency, t r For quick time.

[0068] After obtaining the linear frequency modulation signal, it is output as an analog signal through the DAC, forming an analog radar baseband signal with a real part (I path) and an imaginary part (Q path), thereby performing the radar transmission signal process.

[0069] The present invention generates radar signals with the advantages of flexible configuration, high frequency accuracy, strong real-time performance, etc., and can provide a stable basic signal source for subsequent single-bit sampling and interference modulation processing.

[0070] Step S20: Acquire a first user setting, select target threshold data according to the first user setting, and perform single-bit sampling and quantization on the radar signal according to the target threshold data to obtain multiple single-bit data.

[0071] Specifically, in the present invention, the physical device for implementing steps S20, S30, and S40 is set on another FPGA. After obtaining the radar signal, the present invention performs single-bit sampling quantization, compares the received radar signal with the target threshold data generated by the FPGA, and completes the single-bit quantization. If the instantaneous amplitude of the radar signal is greater than the instantaneous amplitude of the target threshold data, it is quantized to 1, otherwise it is quantized to 0, and the quantized valid data is stored in the FIFO in a data stream manner, thereby performing the single-bit interception process. Correspondingly, the signal expression after single-bit quantization is the following formula (2):

[0072]

[0073] Among them, h(t r ) is the quantization threshold signal, sign is the sign function, and It means taking the real part and imaginary part.

[0074] Furthermore, the obtaining of the first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data may also include:

[0075] Pre-set single-frequency signal threshold data, triangle wave threshold data, sawtooth wave threshold data and square wave threshold data;

[0076] The single-frequency signal threshold data, the triangle wave threshold data, the sawtooth wave threshold data, and the square wave threshold data are stored in four read-only memories respectively.

[0077] Specifically, the quantization threshold plays a vital role in single-bit interference. Since single-bit quantization will introduce a large number of harmonics, the amplitude, frequency, phase and other parameters of the quantization threshold can be reasonably designed to effectively utilize harmonics with different characteristics and enhance the deception and suppression effect of the composite interference modulation signal. In order to achieve different types of quantization thresholds, the present invention pre-stores four different waveforms in the FPGA, namely single-frequency signal, triangle wave, sawtooth wave and square wave. Each waveform is stored in four independent ROM modules in the form of data of N sampling points, and the four independent ROM modules are all set inside the FPGA. The output waveform can be flexibly switched through the threshold selection button, and the ROM data reading clock T can be adjusted. rd_clkTo control the rate of data readout, flexible control of the output frequency of the quantization threshold signal is achieved. Specifically, to meet different interference requirements, when it is necessary to ensure the realism and precision of the distance to the false target, a single-frequency signal can be selected as the quantization threshold; when a triangle wave is selected as the quantization threshold, the false target interference component, high-order harmonic component, and radio frequency component in the single-bit signal coexist, achieving a coordinated interference effect of false target interference and noise-like suppression; when the interference suppression effect needs to be further strengthened, a sawtooth wave can be used as the quantization threshold; because a square wave as the quantization threshold will introduce a large number of odd harmonics, it is suitable for application scenarios that require strong suppression interference or complex false target deception effects.

[0078] Furthermore, the acquiring of the first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data specifically includes:

[0079] Obtaining a first user setting, obtaining target threshold data from the four read-only memories according to the first user setting, and converting the target threshold data into an analog signal according to a digital-to-analog converter;

[0080] Comparing the radar signal with the target threshold data based on a high-speed comparator, determining and converting the radar signal to a logic value of 1 when the radar signal is greater than the target threshold data, and determining and converting the radar signal to a logic value of 0 when the radar signal is not greater than the target threshold data;

[0081] Obtain a third user setting, select a target sampling mode from an intermittent sampling mode and a continuous sampling mode according to the third user setting, and sample the radar signal after determination and processing by the high-speed comparator according to the target sampling mode to obtain multiple single-bit data.

[0082] Specifically, if Figure 2As shown in the figure, after selecting the target threshold data, it is converted into an analog signal by a DAC and connected to the threshold control terminal of the high-speed comparator TLV3501. To dynamically adjust the quantization threshold amplitude, a potentiometer is connected in parallel to the DAC output to adjust its output voltage. The potentiometer acts as a variable voltage divider resistor. By rotating the position of the potentiometer's slider, the amplitude of the DAC output signal can be continuously adjusted, enabling flexible control of the threshold signal amplitude. Simultaneously, the radar signal is connected to the input of the high-speed comparator TLV3501. The comparator performs a real-time comparison between the input signal and the threshold signal. When the input signal amplitude exceeds the threshold signal amplitude, the comparator outputs a high level, indicating that the radar signal is detected and converted to a logical value of 1. When the input signal amplitude is less than the threshold signal amplitude, the comparator outputs a low level, indicating that the radar signal is detected and converted to a logical value of 0, thus generating a single-bit quantized result. The comparator output is then fed into the FPGA as a single-bit data stream, which is synchronously sampled and buffered by the FPGA using a set sampling clock.

[0083] Furthermore, in the present invention, two caching modes are set: intermittent sampling mode and continuous sampling mode. The present invention determines the user's choice through a third user setting. Among them, the sampling mode is switched by a sampling mode control button. The present invention sets a sampling state flag for control, which is 0 in the initial state, corresponding to the continuous sampling mode. Each time the button is pressed, the sampling state flag will flip (0 becomes 1, 1 becomes 0), thereby completely switching between complete sampling and intermittent sampling; when the sampling state flag is 0, the FPGA will completely sample a radar pulse signal; when the flag is 1, it switches to intermittent sampling mode, and intermittently samples the radar pulse signal according to the time window generated by the counter to produce the effect of intermittent sampling forwarding interference. After the sampling is completed, the sampled N-point single-bit data is stored in the FIFO for caching for subsequent interference modulation.

[0084] Step S30: Acquire a second user setting, select a target interference modulation mode according to the second user setting, perform interference modulation on all single-bit data according to the target interference modulation mode, and obtain a composite interference modulation signal.

[0085] Specifically, the present invention performs interference modulation on the obtained single-bit data. When valid data is stored in the FIFO, the logic level of the interference modulation enable port in the corresponding FPGA is raised, and the valid data is read from the FIFO for interference modulation. The present invention supports two interference modulation modes: range-directed false target interference modulation and noise convolution interference modulation. Furthermore, a modulation mode flag is provided to indicate the interference modulation mode. The initial state is 0, corresponding to range-directed false target interference modulation, and 1 indicates noise convolution interference modulation. This flag is controlled by an interference modulation mode selection button. Each time the button is triggered, the flag flips, enabling dynamic switching between different interference modes; that is, the user can control which interference modulation mode to select.

[0086] Further, obtaining the second user setting, selecting a target interference modulation mode according to the second user setting, and performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0087] Acquire a second user setting, and select a target interference modulation mode from range-directed false target interference modulation and noise convolution interference modulation according to the second user setting;

[0088] All single-bit data are interference modulated according to the target interference modulation mode to obtain a composite interference modulation signal.

[0089] In the present invention, for two different interference modulation modes, the present invention obtains the user's needs through the second user selection, and thus selects the corresponding interference modulation mode as the target interference modulation mode.

[0090] Furthermore, performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0091] When the target interference modulation mode is range-directed false target interference modulation, a plurality of frequency-shift modulation signal data are obtained;

[0092] Perform a logical XOR operation on each of the single bits and the sign bit of the corresponding frequency-shift modulated signal data to generate a target sign bit, and splice each of the target sign bits with the data bit of the current frequency-shift modulated signal data to obtain a corresponding composite interference modulation signal.

[0093] Specifically, if Figure 3 As shown, in order to ensure the real-time performance of interference modulation, the N-point frequency shift modulation signal exp(-j2πf d t r) is stored in the ROM module; during the interference modulation process, N-point radar signal data is read out from the FIFO in sequence, and at the same time, the corresponding N-point 32-point frequency-shifted modulation signal data is read out from the ROM in sequence. Since the radar signal has been quantized into single-bit data, single-bit multiplication is used in the FPGA for real-time modulation. The single-bit multiplication performs a logical exclusive-OR (XNOR) operation on the single-bit radar data and the sign bit of the frequency-shifted modulation signal to generate a new sign bit, which is then spliced with the data bit of the frequency-shifted modulation signal to obtain the output signal after interference modulation. By using single-bit multiplication, the present invention avoids the use of a multiplier with high computational complexity, saving computing resources. At the same time, since only logical operations are used, the delay introduced by the timing circuit is avoided, further ensuring the real-time performance of the interference modulation, and meeting the requirements of the single-bit interference system for high-speed data processing.

[0094] Correspondingly, range-directed false target interference modulation is used on the FPGA to implement range-directed false target interference, that is, the received single-bit radar signal is multiplied by the frequency-shifted modulation signal. The signal expression after frequency shift, that is, the formula for generating the composite interference modulation signal is shown in formula (3):

[0095] s d (t r )=s1(t r )exp(-j2πf d t r ); (3)

[0096] in, is the frequency shift in the range direction, d is the false target offset in the range direction, and c is the speed of light.

[0097] Furthermore, performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes:

[0098] When the target interference modulation mode is noise convolution interference modulation, obtaining a plurality of preset Gaussian white noise data;

[0099] Based on two buffers, all single-bit data are aligned with the preset Gaussian white noise data;

[0100] Performing a single-bit multiplication operation on each single-bit data and the corresponding Gaussian white noise data, and accumulating the result into an accumulator;

[0101] When the single-bit multiplication operation is completed on all single-bit data and the corresponding Gaussian white noise data, a composite interference modulation signal is output according to the accumulator.

[0102] Specifically, if Figure 4As shown, since the radar signal has been quantized into single-bit data, the present invention further proposes a single-bit time-domain convolution method based on FPGA, that is, a method for aligning the composite interference modulation signal with the preset Gaussian white noise data. Specifically, the method includes: pre-storing Gaussian white noise template data of length M in the ROM module for performing linear convolution operations with the real-time radar signal; during the modulation process, firstly initializing two buffers A[n] and B[n] for storing the radar signal data and Gaussian white noise data read from the FIFO and ROM respectively; when a radar signal data is read, firstly shifting the entire data in A[n] to the left by one address bit, and then storing the newly read data in A[0]; B[n] places the first received Gaussian white noise data at the starting position B[0] of the buffer, and the subsequent received data are stored in the subsequent positions of the buffer, i.e., B[1], B[2], ..., B[M-1]. This double buffer structure not only realizes the alignment of radar data and noise template, but also provides a stable timing and strong data continuity input guarantee for the subsequent real-time convolution calculation. Next, the convolution operation phase begins. The accumulator is cleared. Then, A[i] and B[i] at corresponding locations are retrieved from the buffer, where i is the index of the corresponding double-buffer structure. The product of these two is calculated using a single-bit multiplication, and the result is then added to the accumulator. This multiplication and accumulation process continues until the index has traversed all data in the buffer. Once all products and accumulations are complete, the convolution result for the current moment is output. The system then determines whether the calculation of the M+N-1 convolution results has been completed. If not, the radar signal data and Gaussian white noise data are read again and the above process is repeated. If completed, the noise convolution interference modulation process is complete.

[0103] Among them, the time domain convolution method is used to realize noise convolution interference modulation, and the signal expression after convolution modulation is shown in formula (4):

[0104]

[0105] Among them, n(t n ) is the Gaussian white noise template, t n is the noise time width.

[0106] Step S40: output the composite interference modulated signal according to the digital signal output setting and the analog signal output setting.

[0107] Specifically, after the composite interference modulated signal is generated, it is output and forwarded. This method includes both digital and analog signal output, and both output modes are performed simultaneously. The digital signal output is sent to the serial modulation assistant on the PC via serial communication, enabling the acquisition and subsequent pulse compression processing of the composite interference modulated signal, and then analyzing the pulse results to verify the validity of the single-bit interference theory. The analog signal output converts the composite interference modulated signal into an analog waveform through a high-speed DAC, which is connected to an oscilloscope for real-time time domain observation, which is used to assist in system debugging and performance evaluation.

[0108] Furthermore, the present invention is further illustrated by experiments. In the experiment, a linear frequency modulation baseband signal with a bandwidth of 50MHz and a pulse duration of 5us is generated as a radar signal; then, another FPGA is used to perform single-bit sampling quantization on the signal at a sampling frequency of 100MHz, and the modulation and generation of the composite interference modulation signal are completed; wherein, the frequencies of the four thresholds are all set to 20MHz, and the signal threshold ratios are all set to 3dB; after the interference modulated signal is collected, MATLAB software is used for pulse compression processing and result analysis. Figure 5 As shown in Figure 2, after the range-directed false target interference modulation, obvious false targets were successfully generated at 40m and 160m. Figure 6 As shown in Figure 1, intermittent sampling is introduced on the basis of distance-directed false target interference modulation to generate multiple randomly distributed false targets at 40m and 160m. Figure 7 As shown in the figure, after the noise convolution interference modulation, the composite interference modulation signal forms a wide range of energy diffusion in the pulse compression result, which masks the position characteristics of the real target.

[0109] This invention constructs a hardware-in-the-loop simulation method for single-bit interference based on an FPGA. This method encompasses a full hardware implementation link for the interference system, from signal acquisition to interference forwarding. This method effectively verifies the hardware complexity and feasibility of single-bit interference technology in practical applications. The key technical modules involved in this invention, such as single-bit data sampling and single-bit data interference modulation methods, are not only suitable for a hardware-in-the-loop simulation verification platform but can also be directly applied to actual single-bit interference systems. This provides a reliable technical foundation and implementation path for the subsequent engineering and systematic application of single-bit interference technology.

[0110] Furthermore, the present invention pre-stores the quantized threshold waveform in the ROM inside the FPGA, and combines the controllable ROM data read clock with an external potentiometer to flexibly adjust the frequency and amplitude of the threshold waveform; a frequency shift modulation method is used in the FPGA to generate a distance-toward false target composite interference modulation signal, and the interference modulation is completed through a single-bit logical operation, avoiding the resource consumption of the traditional multiplier, while reducing the timing delay and ensuring the real-time and stability of the interference modulation; in addition, the present invention uses a single-bit time domain convolution method in the FPGA to generate a noise composite interference modulation signal, avoiding complex and inefficient time domain conversion operations and reducing the computational complexity of the convolution modulation.

[0111] The present invention is based on a direct digital frequency synthesis technology module, generates a digital orthogonal linear frequency modulation signal, generates a linear frequency modulation signal according to pre-set configuration parameters, and generates a radar signal according to the linear frequency modulation signal; obtains a first user setting, selects target threshold data according to the first user setting, performs single-bit sampling and quantization on the radar signal according to the target threshold data to obtain multiple single-bit data; obtains a second user setting, selects a target interference modulation mode according to the second user setting, performs interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal; and outputs the composite interference modulation signal according to a digital signal output setting and an analog signal output setting. The present invention implements a corresponding single-bit composite interference generation method for radar on a field programmable gate array platform; through the single-bit composite interference generation method for radar, it is possible to sample the radar transmission signal in real time, generate multiple quantization thresholds in real time and perform single-bit quantization processing, while completing rapid interference modulation, and realizing multiple interference effects such as range deception interference, convolution noise interference, and intermittent sampling interference; the present invention is also verified based on a semi-physical device, and can effectively evaluate the performance of the single-bit interference method under actual engineering devices, overcoming the limitation of the prior art that only stays at the simulation level, and has the advantages of fast processing speed, simple structure, strong scalability, etc., and can complete interference countermeasures against pulse compression radar devices.

[0112] Furthermore, if Figure 8 As shown, based on the above-mentioned single-bit composite interference generation method for radar, the present invention also provides a single-bit composite interference generation device for radar, wherein the single-bit composite interference generation device for radar includes:

[0113] A radar signal generation module is used to generate a digital orthogonal linear frequency modulation signal based on a direct digital frequency synthesis technology module, and to generate a linear frequency modulation signal according to preset configuration parameters, and to generate a radar signal according to the linear frequency modulation signal;

[0114] a single-bit data sampling module, configured to obtain a first user setting, select target threshold data according to the first user setting, and perform single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data;

[0115] an interference modulation module, configured to obtain a second user setting, select a target interference modulation mode according to the second user setting, and perform interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal;

[0116] The composite interference modulated signal forwarding module is used to output the composite interference modulated signal according to the digital signal output setting and the analog signal output setting.

[0117] Furthermore, the device shown in the present invention also includes a specific physical device, such as Figure 9 As shown, the present invention proposes a single-bit composite interference generator for radar. The simulator hardware is primarily composed of two FPGAs: the first FPGA is used to generate a linear frequency modulation signal to simulate the radar transmission signal, while the second FPGA performs single-bit sampling and quantization processing on the received radar signal during the sampling process and completes the corresponding interference modulation. The entire system is primarily composed of a radar signal generation module, a quantization threshold generation module, a single-bit data sampling module, an interference modulation module, and a composite interference modulation signal forwarding module, each of which achieves a corresponding effect. The quantization threshold generation module is used to pre-set single-frequency signal threshold data, triangular wave threshold data, sawtooth wave threshold data, and square wave threshold data, and store the single-frequency signal threshold data, the triangular wave threshold data, the sawtooth wave threshold data, and the square wave threshold data in four read-only memories, respectively.

[0118] Furthermore, if Figure 10 As shown, based on the above-mentioned single-bit composite interference generation method and device for radar, the present invention also provides a terminal, which includes a processor 10, a memory 20 and a display 30. Figure 10 Only some of the components of the terminal are shown, but it should be understood that implementation of all of the shown components is not required, and more or fewer components may be implemented instead.

[0119] In some embodiments, the memory 20 may be an internal storage unit of the terminal, such as a hard drive or memory of the terminal. In other embodiments, the memory 20 may also be an external storage device of the terminal, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash memory card, etc. equipped on the terminal. Furthermore, the memory 20 may include both the internal storage unit of the terminal and an external storage device. The memory 20 is used to store application software installed on the terminal and various types of data, such as program code of the terminal. The memory 20 may also be used to temporarily store data that has been output or is about to be output. In one embodiment, the memory 20 stores a single-bit composite interference generation program 40 for radar. The single-bit composite interference generation program 40 for radar can be executed by the processor 10, thereby implementing the single-bit composite interference generation method for radar of the present invention.

[0120] In some embodiments, the processor 10 may be a central processing unit (CPU), a microprocessor, or other data processing chip, configured to execute program code or process data stored in the memory 20, such as executing the single-bit composite interference generation method for radar.

[0121] In some embodiments, the display 30 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch screen, etc. The display 30 is used to display information on the terminal and to display a visual user interface.

[0122] In one embodiment, when the processor 10 executes the radar-targeted single-bit composite interference generation program 40 in the memory 20 , the steps of the above radar-targeted single-bit composite interference generation method are implemented.

[0123] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a single-bit composite interference generation program for radar, and when the single-bit composite interference generation program for radar is executed by a processor, the steps of the single-bit composite interference generation method for radar as described above are implemented.

[0124] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or terminal comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or terminal comprising the element.

[0125] Of course, those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing related hardware (such as a processor, controller, etc.) through a computer program. The program can be stored in a computer-readable storage medium that can be read by a computer. When the program is executed, it can include the processes in the above-described method embodiments. The computer-readable storage medium can be a memory, a magnetic disk, an optical disk, etc.

[0126] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for generating single-bit composite interference for radar, characterized in that: The single-bit composite interference generation method for radar includes: Based on the direct digital frequency synthesis technology module, a digital orthogonal linear frequency modulation signal is generated, and according to the pre-set configuration parameters, a linear frequency modulation signal is generated, and a radar signal is generated according to the linear frequency modulation signal; obtaining a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data; Obtaining a second user setting, selecting a target interference modulation mode according to the second user setting, and performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal; The composite interference modulated signal is output according to the digital signal output setting and the analog signal output setting.

2. The method for generating single-bit composite interference for radar according to claim 1, characterized in that: The direct digital frequency synthesis technology module generates a digital orthogonal linear frequency modulation signal, generates a linear frequency modulation signal according to preset configuration parameters, and generates a radar signal according to the linear frequency modulation signal, specifically including: Generate digital orthogonal linear frequency modulation signals based on direct digital frequency synthesis technology module; Presetting configuration parameters, and calculating the phase increment according to the pre-set configuration parameters; generating the linear frequency modulation signal according to the phase increment and the digital quadrature linear frequency modulation signal; The linear frequency modulation signal is processed based on a digital-to-analog converter to obtain the radar signal.

3. The method for generating single-bit composite interference for radar according to claim 1, characterized in that: The obtaining of a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data, further comprises: Pre-set single-frequency signal threshold data, triangle wave threshold data, sawtooth wave threshold data and square wave threshold data; The single-frequency signal threshold data, the triangle wave threshold data, the sawtooth wave threshold data, and the square wave threshold data are stored in four read-only memories respectively.

4. The method for generating single-bit composite interference for radar according to claim 3, characterized in that: The acquiring of a first user setting, selecting target threshold data according to the first user setting, and performing single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data specifically includes: Obtaining a first user setting, obtaining target threshold data from the four read-only memories according to the first user setting, and converting the target threshold data into an analog signal according to a digital-to-analog converter; Comparing the radar signal with the target threshold data based on a high-speed comparator, determining and converting the radar signal into a logic value of 1 when the radar signal is greater than the target threshold data, and determining and converting the radar signal into a logic value of 0 when the radar signal is not greater than the target threshold data; Obtain a third user setting, select a target sampling mode from an intermittent sampling mode and a continuous sampling mode according to the third user setting, and sample and quantize the radar signal after determination and processing by the high-speed comparator according to the target sampling mode to obtain multiple single-bit data.

5. The method for generating single-bit composite interference for radar according to claim 1, characterized in that: The obtaining of the second user setting, selecting a target interference modulation mode according to the second user setting, and performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes: Acquire a second user setting, and select a target interference modulation mode from range-directed false target interference modulation and noise convolution interference modulation according to the second user setting; All single-bit data are interference modulated according to the target interference modulation mode to obtain a composite interference modulation signal.

6. The method for generating single-bit composite interference for radar according to claim 5, characterized in that: The step of performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes: When the target interference modulation mode is range-directed false target interference modulation, a plurality of frequency-shift modulation signal data are obtained; Perform a logical XOR operation on each of the single bits and the sign bit of the corresponding frequency-shift modulated signal data to generate a target sign bit, and splice each of the target sign bits with the data bit of the current frequency-shift modulated signal data to obtain a corresponding composite interference modulation signal.

7. The method for generating single-bit composite interference for radar according to claim 5, characterized in that: The step of performing interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal specifically includes: When the target interference modulation mode is noise convolution interference modulation, obtaining a plurality of preset Gaussian white noise data; Based on two buffers, all single-bit data are aligned with the preset Gaussian white noise data; Performing a single-bit multiplication operation on each single-bit data and the corresponding Gaussian white noise data, and accumulating the result into an accumulator; When the single-bit multiplication operation is completed on all single-bit data and the corresponding Gaussian white noise data, a composite interference modulation signal is output according to the accumulator.

8. A single-bit composite interference generation device for radar, characterized in that: The single-bit composite interference generating device for radar includes: A radar signal generation module is used to generate a digital orthogonal linear frequency modulation signal based on a direct digital frequency synthesis technology module, and to generate a linear frequency modulation signal according to preset configuration parameters, and to generate a radar signal according to the linear frequency modulation signal; a single-bit data sampling module, configured to obtain a first user setting, select target threshold data according to the first user setting, and perform single-bit sampling and quantization on the radar signal according to the target threshold data to obtain a plurality of single-bit data; an interference modulation module, configured to obtain a second user setting, select a target interference modulation mode according to the second user setting, and perform interference modulation on all single-bit data according to the target interference modulation mode to obtain a composite interference modulation signal; The composite interference modulated signal forwarding module is used to output the composite interference modulated signal according to the digital signal output setting and the analog signal output setting.

9. A terminal, characterized in that: The terminal includes: a memory, a processor, and a single-bit composite interference generation program for radar stored in the memory and runnable on the processor. When the single-bit composite interference generation program for radar is executed by the processor, the steps of the single-bit composite interference generation method for radar according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a single-bit composite interference generation program for radar, and when the single-bit composite interference generation program for radar is executed by a processor, the steps of the single-bit composite interference generation method for radar according to any one of claims 1 to 7 are implemented.

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