A speed distance multiple towed jammer generation method and apparatus

Abstract

The application belongs to the technical field of radio countermeasure, and provides a speed-distance multiple trailing interference generation method and device, which comprises the following steps: performing digital down-conversion processing on external radar signals to generate baseband digital IQ signals and store them; obtaining a control message, and obtaining a Doppler frequency control word and a delay value based on the control message; generating a digital local oscillator signal superimposed with a Doppler frequency offset signal according to the Doppler frequency control word; reading the baseband digital IQ signals and the digital local oscillator signal; the delay value determines the reading time of the baseband digital IQ signals and the digital local oscillator signal; performing digital up-conversion processing on the baseband digital IQ signals and the digital local oscillator signal to generate a mixed signal superimposed with a Doppler frequency offset; and outputting an analog signal according to the mixed signal. The baseband digital IQ signals and the digital local oscillator signal are read through a predetermined delay value, and the Doppler frequency control word is combined, so that multiple interference signals with distance trailing, speed trailing or combined distance and speed trailing can be generated.

Description

Technical Field

[0001] This invention relates to the field of radio electronic countermeasures technology, specifically to a method and apparatus for generating speed-range multi-drag jamming. Background Technology

[0002] Range-velocity dragging jamming is a common jamming method used to interfere with radars that have target tracking capabilities. It typically includes velocity gate dragging jamming, range gate dragging jamming, and combined range-velocity dragging jamming.

[0003] Velocity gate jamming is a commonly used deceptive jamming method for velocity tracking systems. When the radar illuminates a target, the jamming device's receiver receives the radar's detection signal and immediately emits a response jamming signal with a frequency almost identical to the target echo. This simulates a false target moving at a certain speed relative to the target echo. If the jamming signal is much stronger than the target echo signal, the "velocity gate" shifts to a false Doppler shift formed by the tracking signal, losing the Doppler shift of the real target and preventing the radar from distinguishing between the real and false targets.

[0004] Range gate dragging is a self-defense technique in which a jammer emits a false echo pulse that has an incremental delay from the radar echo pulse. Since the radar determines the target distance by measuring the arrival time of the echo pulse, this technique makes the target distance measured by the radar farther than the actual target distance. In essence, it delays the radar's accurate distance information.

[0005] However, traditional range and velocity drag jamming has problems such as only generating one false target, being easily identified by radar, and being easily eliminated by radar with corresponding anti-jamming technology, and being ineffective in jamming radars that can track multiple targets. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a speed-distance multi-drag interference method, device, or electronic device to solve the problem that current drag interference methods cannot generate multiple false targets.

[0007] In a first aspect, the present invention provides a method for generating multiple drag interference based on velocity and distance, comprising:

[0008] The intermediate frequency signal from the external radar is digitally down-converted to generate a baseband digital IQ signal and stored.

[0009] Acquire control messages, and obtain the Doppler frequency control word and delay value based on the control messages;

[0010] A digital local oscillator signal is generated based on the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal;

[0011] The baseband digital IQ signal and the digital local oscillator signal are read; the delay value determines the reading time of the baseband digital IQ signal and the digital local oscillator signal.

[0012] The baseband digital IQ signal and the digital local oscillator signal are digitally up-converted to generate a mixed signal superimposed with Doppler frequency offset;

[0013] An analog signal is output based on the mixing signal.

[0014] As can be seen from the above technical solution, the speed and distance multiple dragging interference method provided by the present invention reads the baseband digital IQ signal and digital local oscillator signal by a predetermined delay value, and at the same time combines the delay value and the Doppler frequency control word to generate multiple interference signals of distance dragging, speed dragging or combined distance and speed dragging, thus solving the problem that the current dragging interference can only generate one false target.

[0015] Optionally, the baseband digital IQ signal and the digital local oscillator signal are read in association according to a dragging method, which includes speed dragging, distance dragging, and combined speed and distance dragging.

[0016] Optionally, when the dragging method is speed dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes:

[0017] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0018] When the timing value reaches the delay value T1, the baseband digital IQ signal and the digital local oscillator signal associated with the n dummy targets are read simultaneously; wherein, there is a frequency offset Δf among the dummy targets. d .

[0019] Optionally, the frequency value of the i-th false target is

[0020] f i =f1+(n-1)·Δf d ,

[0021] Where f1 is the frequency value of the first dummy target, n is the drag weight, and i is a positive integer not greater than the drag weight n.

[0022] Optionally, when the dragging method is distance dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes:

[0023] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0024] When the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is determined according to the delay value T1 and the drag interval Δt.

[0025] Optionally, the delay value Ti is determined according to formula T. i =T1+(i-1)·Δt is determined; i is a positive integer not greater than the drag weight n.

[0026] Optionally, when the towing method is a combined speed and distance towing, the reading method of the baseband digital IQ signal and the digital local oscillator signal is determined according to relevant flag parameters;

[0027] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0028] When the relevant flag parameter is relevant: when the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is determined according to the delay value T1 and the drag interval Δt;

[0029] When the relevant flag parameters are uncorrelated: when the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th false target are read; wherein, the delay value Ti is determined according to the delay value T1 and the drag interval Δt, and there is a frequency offset value Δf between the i-th false target and the adjacent false target. d .

[0030] Optionally, the delay value Ti is determined according to formula T. i =T1+(i-1)·Δt is determined; i is a positive integer not greater than the drag weight n;

[0031] When the relevant flag parameters are irrelevant, the frequency value of the i-th false target is f. i =f1+(n-1)·Δf d Where f1 is the frequency value of the first dummy target, n is the drag weight, and i is a positive integer not greater than the drag weight n.

[0032] Optionally, when the drag weight is greater than 1, the step of outputting an analog signal based on the mixing signal includes:

[0033] The multiple mixed signals are superimposed, divided by the drag weight, and then output after analog-to-digital conversion.

[0034] Secondly, the present invention provides a velocity-distance multi-drag interference generation device, comprising:

[0035] The digital downconversion module is used to perform digital downconversion processing on the intermediate frequency signal of the external radar, generate the baseband digital IQ signal and store it;

[0036] The parsing and calculation module is used to obtain control messages and, based on the control messages, obtain the Doppler frequency control word and delay value;

[0037] The DDS control module is used to generate a digital local oscillator signal according to the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal.

[0038] A read / write control module is used to read the baseband digital IQ signal and the digital local oscillator signal; the delay value determines the reading time of the baseband digital IQ signal and the digital local oscillator signal.

[0039] A digital upconversion module is used to perform digital upconversion processing on the baseband digital IQ signal and the digital local oscillator signal to generate a mixed signal superimposed with Doppler frequency offset;

[0040] The digital-to-analog converter module is used to output an analog signal based on the mixing signal.

[0041] Thirdly, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the above methods.

[0042] Fourthly, one embodiment of the present invention provides a computer-readable storage medium having stored thereon computer program instructions that, when executed by a processor, implement the steps of any of the above methods.

[0043] By adopting the above technical solution, this application has the following beneficial effects:

[0044] This invention provides a velocity-range multi-drag interference method that reads baseband digital IQ signals and digital local oscillator signals by a predetermined delay value, and combines the delay value and Doppler frequency control word to generate multiple interference signals of range drag, velocity drag, or combined range and velocity drag. This solves the problem that current drag interference can only generate one false target, and does not reduce the instantaneous bandwidth of the system, thereby increasing the interference effect on radar. Attached Figure Description

[0045] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0046] Figure 1 A flowchart of a speed-distance multiple drag interference generation method provided by an embodiment of the present invention is shown;

[0047] Figure 2 A block diagram of an interference generation unit provided in an embodiment of the present invention is shown;

[0048] Figure 3 This diagram illustrates the time-domain characteristics of velocity drag interference provided in an embodiment of the present invention.

[0049] Figure 4 This diagram illustrates the frequency domain characteristics of velocity drag interference provided in an embodiment of the present invention.

[0050] Figure 5 This diagram illustrates the time-domain characteristics of the distance drag interference provided in an embodiment of the present invention.

[0051] Figure 6 A schematic diagram of a speed-distance multi-drag interference generation device provided in an embodiment of the present invention is shown;

[0052] Figure 7 A structural block diagram of an electronic device provided by an embodiment of the present invention is shown. Detailed Implementation

[0053] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore merely examples, and should not be construed as limiting the scope of protection of the present invention.

[0054] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by those skilled in the art to which this invention pertains.

[0055] Range-gate dragging jamming, velocity-gate dragging jamming, and combined range-velocity dragging jamming are commonly used forms of gate dragging jamming. They employ false targets and information to affect the radar's detection and tracking system, preventing the radar from correctly detecting the real target. However, after the jamming occurs, the radar's received signal energy will surge more than twofold, and subtle intra-pulse characteristics will also change abruptly. Furthermore, the dragging jamming occurs one pulse later than the radar signal, and only one false target can be generated, making it easy for the radar to identify the false target.

[0056] To address the above problems, in one embodiment, such as Figure 1 As shown, a method for generating multiple drag interference based on speed and distance is provided. The following will combine... Figure 2 The method provided in this embodiment will be described. The method for generating multiple drag interference based on velocity and distance includes:

[0057] S1. Perform digital down-conversion processing on the external radar intermediate frequency signal to generate a baseband digital IQ signal and store it;

[0058] Specifically, after acquiring the external radar intermediate frequency signal, the control unit generates a detection gate. The analog-to-digital converter (ADC) first performs digital down-conversion on the received external radar intermediate frequency signal and then stores it in the memory chip.

[0059] S2. Obtain the control message, and obtain the Doppler frequency control word and delay value based on the control message;

[0060] The interference generation unit receives signals in real time through the SPI interface to generate the required control messages. Then, it parses the messages to obtain the parameters required for generating the drag interference signal. Next, it performs relevant calculations on various parameters to obtain the Doppler frequency control word required for signal generation and the delay value for reading data from the memory chip.

[0061] S3. Generate a digital local oscillator signal based on the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal;

[0062] like Figure 2 As shown, the Doppler frequency control word controls the DDS to generate a digital local oscillator signal, and the digital local oscillator signal output by the DDS is superimposed with a Doppler frequency offset.

[0063] The following example illustrates how to generate the digital local oscillator signal in this step. Taking the frequency control word corresponding to the local oscillator signal frequency f0 as x0, and the Doppler frequency control word corresponding to the Doppler frequency offset signal frequency f1 as x1, the Doppler frequency control word of the digital local oscillator signal is x0 ± x1 (the addition or subtraction is determined by the drag direction). Based on this Doppler frequency control word, the DDS module can be controlled to generate the digital local oscillator signal required for digital up-conversion. Compared to modulation signals obtained by other modulation methods, this implementation is simpler.

[0064] S4. Read the baseband digital IQ signal and digital local oscillator signal; the delay value determines the reading time of the baseband digital IQ signal and digital local oscillator signal;

[0065] In this step, the baseband digital IQ signal is read from the content stored in the memory chip in step S1. The delay value determines the reading time; see [link to relevant documentation]. Figure 3 t1 is the lower limit of the pulse width, t2 is the detection duration, and t3 is the delay value obtained in step S2, which determines... Figure 2 The read / write control module controls the reading time of the baseband digital IQ signal and the digital local oscillator signal.

[0066] S5. Perform digital up-conversion processing on the baseband digital IQ signal and the digital local oscillator signal to generate a mixed signal superimposed with Doppler frequency offset;

[0067] The baseband digital IQ signal and digital local oscillator signal are input into the digital upconversion module for digital upconversion processing, so as to superimpose the Doppler signal onto the relay signal.

[0068] S6. Output analog signal based on the mixing signal.

[0069] Based on the dragging rules, parameters such as start time, dragging time, stop dragging time, and shutdown time are used to determine whether the signal needs to be output. If output is required, the amplitude-modulated signal is sent to the digital-to-analog converter (DAC) to control the DAC to convert the obtained mixed signal into an analog signal for output.

[0070] Corresponding to different dragging methods, the baseband digital IQ signal and digital local oscillator signal are read in association according to the different dragging methods, including speed dragging, distance dragging, and combined speed and distance dragging. The following explains how the baseband digital IQ signal and digital local oscillator signal are read for different dragging methods.

[0071] When the dragging method is speed dragging, see Figure 3 Reading the baseband digital IQ signal and digital local oscillator signal mainly includes the following steps:

[0072] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0073] When the timing value reaches the delay value T1, simultaneously read the baseband digital IQ signal and digital local oscillator signal associated with n dummy targets; see [link / reference]. Figure 4 There is a frequency offset Δf between the false targets. d .

[0074] The frequency value of the i-th false target is f. i =f1+(n-1)·Δf d ,

[0075] Where f1 is the frequency value of the first dummy target, n is the drag weight, and i is a positive integer not greater than the drag weight n.

[0076] For the speed gate towing mechanism, the parameters mainly include detection duration, power attenuation, power type, power fluctuation type, towing pattern, towing direction, initial frequency offset, frequency towing speed, frequency towing acceleration, start time, towing time, stop time, shutdown time, towing weight, and towing interval. When the towing weight is set to 1, the current target's distance, speed, and power are calculated based on the target distance, initial frequency offset, frequency towing speed, start time, towing time, and stop time, and then sent to the interference generation unit. The interference generation unit calculates the delay value, Doppler value, and attenuation value based on the distance and power to obtain the digital local oscillator signal. The baseband digital IQ signal and the digital local oscillator signal are digitally up-converted and then converted to obtain a mixed signal superimposed with Doppler frequency offset. When the towing weight is greater than 1, each dummy target forwards according to the set towing pattern. First, when the timing value reaches T1, multiple DDSs are controlled. i Read the baseband digital IQ signal and digital local oscillator signal corresponding to the i-th associated false target. The frequency phase difference Δf between the i-th false target and its adjacent false targets is... d .

[0077] When the dragging method is distance dragging, see Figure 5 Reading the baseband digital IQ signal and digital local oscillator signal mainly includes the following steps:

[0078] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0079] When the timed value reaches the delay value Ti, the baseband digital IQ signal and digital local oscillator signal associated with the i-th dummy target are read; where the delay value Ti is determined based on the delay value T1 and the drag interval Δt. There is a time offset between each dummy target.

[0080] The delay value Ti of the i-th dummy target is determined according to the formula T. i =T1+(i-1)·Δt is determined; i is a positive integer not greater than the drag weight n.

[0081] For the range-gate tow mechanism, the main parameters include detection duration, power attenuation, power type, power fluctuation type, tow pattern, tow direction, initial position offset, tow speed, tow acceleration, start time, tow time, stop time, shutdown time, tow weight, and tow interval. When the tow weight is set to 1, the current target's distance, speed, and power are calculated based on the target distance, target speed, start time, tow time, and stop time, and then sent to the interference generation unit. The interference generation unit calculates the delay value, Doppler value, and attenuation value based on the distance and power to obtain the digital local oscillator signal. The baseband digital IQ signal and the digital local oscillator signal are then digitally up-converted to obtain a mixed signal superimposed with Doppler frequency offset. When the drag weight is greater than 1, each dummy target is forwarded according to the set drag rule. First, when the timing value reaches the delay value T1, the DDS1 is controlled to read the baseband digital IQ signal and digital local oscillator signal required by the first associated dummy target. Then, when the timing value reaches the delay value T2, the DDS2 is controlled to read the baseband digital IQ signal and digital local oscillator signal required by the second associated dummy target. Following this rule, the baseband digital IQ signal and digital local oscillator signal required by the nth dummy target are read at the delay value Tn.

[0082] When the towing method is speed-distance combined towing, the reading method of the baseband digital IQ signal and digital local oscillator signal is determined according to the relevant flag parameters;

[0083] Start timing when the upper edge of the receiving gate is detected, and acquire the timing value;

[0084] Then, based on the correlation of relevant flag parameters, the signal is read to generate false targets:

[0085] When the relevant flag parameter is related: when the timing value reaches the delay value Ti, the baseband digital IQ signal and digital local oscillator signal associated with the i-th dummy target are read; where the delay value Ti is determined according to the delay value T1 and the drag interval Δt;

[0086] When the relevant flag parameters are uncorrelated: when the timing value reaches the delay value Ti, the baseband digital IQ signal and digital local oscillator signal associated with the i-th dummy target are read; where the delay value Ti is determined according to the delay value T1 and the drag interval Δt, and there is a frequency offset value Δf between the i-th dummy target and its adjacent dummy targets. d .

[0087] Regardless of whether the relevant flag parameters are relevant or irrelevant, the reading time of the i-th false target is related to the delay value Ti according to the formula T i =T1+(i-1)·Δt is determined; i is a positive integer not greater than the drag weight n.

[0088] When the relevant flag parameters are irrelevant, the frequency value of the i-th false target is f. i =f1+(n-1)·Δf d Where f1 is the frequency value of the first dummy target, n is the drag weight, and i is a positive integer not greater than the drag weight n.

[0089] It should be noted that the relevant flag parameters and drag weights are preset values ​​and need to be set according to the actual application scenario.

[0090] Specifically, the parameters for range-velocity joint multiple towing mainly include detection duration, power attenuation, power type, power fluctuation type, correlation flags, towing pattern, towing direction, initial position offset, towing speed, towing acceleration, initial frequency offset, towing speed, towing acceleration, start time, towing time, stop time, shutdown time, towing count, and towing interval. When the correlation flag parameter is correlated, the generation mechanism of range-velocity joint multiple towing is the same as that of range towing; when the correlation flag parameter is uncorrelated, the time domain generation method is the same as that of range towing, and the frequency domain generation method is the same as that of velocity towing.

[0091] In range-velocity combined multiple towing, when the towing weight is greater than 1, the time domain of the i-th false target always exhibits a time offset Δt, while in the frequency domain, there is no frequency offset when the correlation flag is correlated, and a frequency offset Δf exists between the i-th false target and its adjacent false targets when the correlation flag is uncorrelated. d .

[0092] Furthermore, when the drag weight is greater than 1, step S6 includes: superimposing multiple mixing signals, dividing by the drag weight, and then outputting them after analog-to-digital conversion.

[0093] See Figure 2 DUC i The output of the mixed signal is amplitude modulated by the amplitude modulation module. Multiple amplitude-modulated mixed signals are superimposed, divided by the drag weight n, and then converted into an analog signal by the DAC before output. The multiple superimposed mixed signals will be greater than the DAC output amplitude, causing signal distortion. Dividing by the drag weight n before DAC conversion can avoid DAC output signal distortion.

[0094] In one embodiment, such as Figure 6 As shown, a speed-distance multi-drag interference generation device is provided, comprising:

[0095] The digital downconversion module 701 is used to perform digital downconversion processing on the intermediate frequency signal of the external radar, generate a baseband digital IQ signal and store it.

[0096] The parsing and calculation module 702 is used to obtain control messages and obtain the Doppler frequency control word and delay value based on the control messages;

[0097] The DDS control module 703 is used to generate a digital local oscillator signal according to the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal.

[0098] The read / write control module 704 is used to read the baseband digital IQ signal and the digital local oscillator signal; the delay value determines the reading time of the baseband digital IQ signal and the digital local oscillator signal.

[0099] The digital upconversion module 705 is used to perform digital upconversion processing on the baseband digital IQ signal and the digital local oscillator signal to generate a mixed signal superimposed with a Doppler frequency offset signal.

[0100] The digital-to-analog converter module 706 is used to output an analog signal based on the mixing signal.

[0101] The speed and distance multiple drag interference generation device 20 provided in this application embodiment adopts the same inventive concept as the speed and distance multiple drag interference generation method described above, and can achieve the same beneficial effects, so it will not be described again here.

[0102] Based on the same inventive concept as the aforementioned speed-distance multiple drag interference generation method, this application also provides an electronic device 80, such as... Figure 7 As shown, the electronic device 80 may include a processor 801 and a memory 802.

[0103] The processor 801 can be a general-purpose processor. The steps of the method disclosed in the embodiments of the present invention can be directly reflected as being executed by the hardware processor, or being executed by a combination of hardware and software modules in the processor.

[0104] Memory 802, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. Memory is any other medium capable of carrying or storing desired program code in the form of instructions or data structures that can be accessed by a computer, but is not limited thereto. In embodiments of the present invention, memory 802 can also be a circuit or any other device capable of implementing storage functions for storing program instructions and / or data.

[0105] This invention provides a computer-readable storage medium for storing computer program instructions for use in the above-described electronic device, which includes a program for performing the above-described method.

[0106] The aforementioned computer storage media can be any available medium or data storage device that a computer can access, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), solid-state drives (SSDs), etc.).

[0107] The above embodiments are only used to provide a detailed description of the technical solutions of this application. However, the descriptions of the above embodiments are only for helping to understand the methods of the embodiments of the present invention and should not be construed as limiting the embodiments of the present invention. Variations or substitutions that can be easily conceived by those skilled in the art should be covered within the protection scope of the embodiments of the present invention.

Claims

1. A method for generating multiple drag interference based on velocity and distance, characterized in that, include: The intermediate frequency signal from the external radar is digitally down-converted to generate a baseband digital IQ signal and stored. Acquire control messages, and obtain the Doppler frequency control word and delay value based on the control messages; A digital local oscillator signal is generated based on the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal; The baseband digital IQ signal and the digital local oscillator signal are read; the delay value determines the reading time of the baseband digital IQ signal and the digital local oscillator signal. The baseband digital IQ signal and the digital local oscillator signal are digitally up-converted to generate a mixed signal superimposed with Doppler frequency offset; An analog signal is output based on the mixing signal; The baseband digital IQ signal and the digital local oscillator signal are read in association according to the dragging method, which includes speed dragging, distance dragging and combined speed and distance dragging. When the dragging method is speed dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes: Start timing when the upper edge of the receiving gate is detected, and acquire the timing value; When the timing value reaches the delay value T1, the baseband digital IQ signal and the digital local oscillator signal associated with the n dummy targets are read simultaneously; wherein, frequency offset exists between the dummy targets. ; The frequency value of the i-th false target is ， in, Let n be the frequency value of the first false target, n be the drag weight, and i be a positive integer not greater than the drag weight n. When the dragging method is distance dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes: Start timing when the upper edge of the receiving gate is detected, and acquire the timing value; When the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is based on the delay value T1 and the drag interval. Sure; The delay value Ti is based on the formula Determined; i is a positive integer not greater than the drag weight n.

2. The method according to claim 1, characterized in that, When the towing method is a combined speed and distance towing, the reading method of the baseband digital IQ signal and the digital local oscillator signal is determined according to the relevant flag parameters; Start timing when the upper edge of the receiving gate is detected, and acquire the timing value; When the relevant flag parameter is relevant: when the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is based on the delay value T1 and the drag interval. Sure; When the relevant flag parameter is uncorrelated: when the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is based on the delay value T1 and the drag interval. It is determined that there is a frequency offset value between the i-th false target and its neighboring false targets. .

3. The method according to claim 2, characterized in that, When the relevant flag parameter is irrelevant, the frequency value of the i-th false target is ,in, Let be the frequency value of the first dummy target, n be the drag weight, and i be a positive integer not greater than the drag weight n.

4. The method according to claim 1, characterized in that, When the drag weight is greater than 1, the step of outputting an analog signal based on the mixing signal includes: The multiple mixed signals are superimposed, divided by the drag weight, and then output after analog-to-digital conversion.

5. A speed-distance multi-drag interference generation device, characterized in that, include: The digital downconversion module is used to perform digital downconversion processing on the intermediate frequency signal of the external radar, generate the baseband digital IQ signal and store it; The parsing and calculation module is used to obtain control messages and, based on the control messages, obtain the Doppler frequency control word and delay value; The DDS control module is used to generate a digital local oscillator signal according to the Doppler frequency control word; the digital local oscillator signal is superimposed with a Doppler frequency offset signal. A read / write control module is used to read the baseband digital IQ signal and the digital local oscillator signal; the delay value determines the reading time of the baseband digital IQ signal and the digital local oscillator signal. A digital upconversion module is used to perform digital upconversion processing on the baseband digital IQ signal and the digital local oscillator signal to generate a mixed signal superimposed with Doppler frequency offset; The digital-to-analog converter module is used to output an analog signal based on the mixing signal; The baseband digital IQ signal and the digital local oscillator signal are read in association according to the dragging method, which includes speed dragging, distance dragging and combined speed and distance dragging. When the dragging method is speed dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes: Start timing when the upper edge of the receiving gate is detected, and acquire the timing value; When the timing value reaches the delay value T1, the baseband digital IQ signal and the digital local oscillator signal associated with the n dummy targets are read simultaneously; wherein, frequency offset exists between the dummy targets. ; The frequency value of the i-th false target is ， in, Let n be the frequency value of the first false target, n be the drag weight, and i be a positive integer not greater than the drag weight n. When the dragging method is distance dragging, reading the baseband digital IQ signal and the digital local oscillator signal includes: Start timing when the upper edge of the receiving gate is detected, and acquire the timing value; When the timing value reaches the delay value Ti, the baseband digital IQ signal and the digital local oscillator signal associated with the i-th dummy target are read; wherein, the delay value Ti is based on the delay value T1 and the drag interval. Sure; The delay value Ti is based on the formula Determined; i is a positive integer not greater than the drag weight n.

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