Intermittent sampling slice superposition forwarding interference implementation method based on DRFM technology

Abstract

The present invention discloses a method for realizing intermittent sampling slice superposition forwarding interference based on DRFM technology, comprising the following steps: S1, a DRFM component receives a radar intermediate frequency signal and system parameters and slice interference strategy parameters sent by a display and control terminal; S2, the DRFM component samples the received radar intermediate frequency signal with a specified width and duty cycle, and saves the slices sampled each time; S3, when the DRFM component forwards, the past M sampling slices are superimposed to form an interference signal and transmitted; S4, step S3 is repeated until the radar signal pulse received by the DRFM component ends. The intermittent sampling slice superposition forwarding interference method of the present invention can produce a more realistic false target group by superimposing multiple false target signals, increasing the difficulty of the radar in distinguishing the true from the false, thereby improving the effectiveness of the interference.

Description

Technical Field

[0001] The invention belongs to the technical field of radar electronic countermeasures, and in particular relates to a method for realizing intermittent sampling slice superposition forwarding interference based on DRFM technology. Background Art

[0002] In modern radar electronic warfare environments, radar systems face various complex electromagnetic environment threats. The complexity of radar transmission signals and the level of radar anti-interference technology are constantly increasing, which poses new challenges to how radar jamming systems can reasonably use jamming resources to effectively jam new radar systems under limited jamming resources. Traditional deception jamming based on DRFM technology generates coherent deception jamming by receiving and modulating the complete radar signal pulses. This implementation method often fails to produce effective jamming effects for new radars with large time widths, rich anti-interference means, and variable waveforms. In addition, deception jamming by completely transmitting and receiving radar pulses will waste limited jamming resources and have low jamming efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a method for realizing intermittent sampling slice superposition forwarding interference based on DRFM technology, which mainly solves the problem that effective interference effect cannot be produced when targeting new system radars with large time width, rich anti-interference means and changeable waveforms.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A method for implementing intermittent sampling slice superposition forwarding interference based on DRFM technology includes the following steps:

[0006] S1, DRFM component receives radar intermediate frequency signal and system parameters and slice interference strategy parameters sent by display and control terminal;

[0007] S2, the DRFM component samples the received radar intermediate frequency signal with a specified width and duty cycle, and saves the slices of each sampling;

[0008] S3, when the DRFM component forwards, it superimposes the past M sampling slices to form an interference signal and transmits it;

[0009] S4, repeat step S3 until the radar signal pulse received by the DRFM component ends.

[0010] Further, in step S3, the model of the interference signal is as follows:

[0011]

[0012] Where, TJ is the intermittent sampling slice width, T J <T p ,s s is the sliced ​​signal after intermittent sampling by the jammer, s T For the radar to transmit a complete signal, N = T p / (2T J ) is the total number of signal slices sampled by the jammer within a radar pulse, T p is the pulse width of the transmitting signal, s J is the interference signal; M represents the number of superimposed interference signals.

[0013] Furthermore, in the present invention, the system parameters include radar frequency band, receiving threshold, receiving gain control parameters; the slice interference strategy parameters include slice width, forwarding times, slice coverage, and transmission attenuation control parameters.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The intermittent sampling slice superposition and forwarding interference method of the present invention can create a more realistic false target group by superimposing multiple false target signals, increasing the difficulty of radar distinguishing the true from the false, thereby improving the effectiveness of interference.

[0016] (2) The present invention can generate a deceptive jamming signal that is highly similar to the real target echo by accurately analyzing the received radar pulse signal and using intermittent sampling, superposition and forwarding to perform slice reconstruction. This highly customized jamming is difficult to be identified by traditional anti-jamming means, which improves the concealment and effectiveness of the jamming. Compared with simple noise jamming and traditional deceptive jamming, slice reconstruction can more accurately match the radar's operating mode and signal processing characteristics, and simulate complex multi-false target scenarios by adjusting parameters such as slice width, slice mode and slice delay, thereby causing serious interference to the radar's detection, tracking and identification capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A block diagram of the working principle of interference signal generation in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the intermittent sampling slice superposition forwarding interference implementation in the DRFM component in the embodiment of the present invention;

[0019] Figure 3 It is a schematic diagram of the working principle of intermittent sampling slice superposition forwarding interference in the present invention;

[0020] Figure 4 It is a time domain diagram of interference signals in the intermittent sampling slice superposition forwarding interference implementation method of the present invention;

[0021] Figure 5 It is the pulse pressure result of the original signal and the intermittent sampling slices superimposed on the forwarding interference signal in the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments of the present invention include but are not limited to the following embodiments.

[0023] Example

[0024] like Figure 1 As shown, the present invention discloses a method for realizing intermittent sampling, slicing, superposition and forwarding interference based on DRFM technology, in which the RF front-end component is used to automatically gain control and down-convert the received radar RF signal, output the radar intermediate frequency signal to the DRFM component, the frequency synthesis unit provides a clock signal to the DRFM component, and the up-conversion unit converts the interference intermediate frequency signal output by the DRFM component to the radar frequency and outputs the interference RF signal. The RF front-end component in this embodiment is a mature module-level product on the market, and the purchased product is the JL-Z12110B2 product of Nanjing Junrui Electronic Technology Co., Ltd.

[0025] After receiving the radar intermediate frequency signal and the interference strategy parameters, the DRFM component generates an interference intermediate frequency signal after intermittent sampling, slicing, superposition and forwarding. The implementation principle diagram of intermittent sampling, slicing, superposition and forwarding interference is shown in the figure. Figure 2 The DRFM component in the present invention is a mature signal processing board card on the market, and the one purchased is the IW-RFSOC-DSP digital-analog mixed signal processing card of Xi'an Pirui Electronic Technology Co., Ltd.

[0026] The control software is run in the display and control terminal, and the system parameters and slice interference strategy parameters are sent to the DRFM component in the control software. The display and control terminal adopts Lenovo ThinkPad E480 laptop computer.

[0027] The specific implementation method of the present invention comprises the following steps:

[0028] S1, the DRFM component receives the radar intermediate frequency signal and the system parameters and slice interference strategy parameters sent by the display and control terminal; wherein the system parameters include radar frequency band, receiving threshold, and receiving gain control parameters; the slice interference strategy parameters include slice width, forwarding times, slice coverage, and transmission attenuation control parameters.

[0029] S2, the DRFM component samples the received radar intermediate frequency signal with a specified width and duty cycle, and saves the slices of each sampling;

[0030] S3, when the DRFM component forwards, it superimposes the past M sampling slices to form an interference signal and transmits it; wherein the model of the interference signal is as follows:

[0031]

[0032] Where, T J is the intermittent sampling slice width, T J <T p ,s s is the sliced ​​signal after intermittent sampling by the jammer, s T For the radar to transmit a complete signal, N = T p / (2T J ) is the total number of signal slices sampled by the jammer within a radar pulse, T p is the pulse width of the transmitting signal, s J is the interference signal; M represents the number of superimposed interference signals.

[0033] S4, repeat step S3 until the radar signal pulse received by the DRFM component ends.

[0034] Its working principle is as follows Figure 3 As shown. Assume that the radar transmits a linear frequency modulation signal with a pulse width of T p = 100μs, bandwidth B = 10MHz, sampling frequency is 2400MHz, intermittent sampling slice pulse width T J =10μs, intermittent sampling period is 2*T J The time domain diagram of intermittent sampling slices superimposed with interference signals is shown in Figure 4 shown.

[0035] Depend on Figure 5 It can be seen that the intermittent sampling slice superposition interference method can create a more realistic false target group by superimposing multiple false target signals, increasing the difficulty of radar distinguishing the true from the false, thereby improving the effectiveness of the interference.

[0036] The above embodiment is only one of the preferred implementation modes of the present invention and should not be used to limit the protection scope of the present invention. Any changes or modifications that are made to the main design concept and spirit of the present invention and have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention.

Claims

1. A method for implementing intermittent sampling slice superposition forwarding interference based on DRFM technology, characterized in that: The following steps are involved: S1, DRFM component receives radar intermediate frequency signal and system parameters and slice interference strategy parameters sent by display and control terminal; S2, the DRFM component samples the received radar intermediate frequency signal with a specified width and duty cycle, and saves the slices of each sampling; S3, when the DRFM component forwards, it superimposes the past M sampling slices to form an interference signal and transmits it; the model of the interference signal is as follows: Where, T J is the intermittent sampling slice width, T J <T p ,s s is the sliced ​​signal after intermittent sampling by the jammer, s T For the radar to transmit a complete signal, N = T p / (2T J ) is the total number of signal slices sampled by the jammer within a radar pulse, T p is the pulse width of the transmitting signal, s J is the interference signal; M represents the number of superimposed interference signals; S4, repeat step S3 until the radar signal pulse received by the DRFM component ends.

2. The method for implementing intermittent sampling slice superposition forwarding interference based on DRFM technology according to claim 1 is characterized in that: The system parameters include radar frequency band, receiving threshold, and receiving gain control parameters; the slice interference strategy parameters include slice width, forwarding times, slice coverage, and transmission attenuation control parameters.

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