Intermittent sampling and slicing direct forwarding interference implementation method based on DRFM technology

Abstract

The invention discloses an intermittent sampling slice direct forwarding interference implementation method based on a DRFM technology. The method comprises the following steps that S1, a DRFM assembly receives a radar intermediate frequency signal and system parameters and slice interference strategy parameters sent by a display control terminal; s2, the DRFM component samples the received radar intermediate-frequency signal with a specified width, and directly forwards an interference signal formed by sampling a pulse signal of each slice width; and S3, repeating the step S2 until the radar signal pulse received by the DRFM assembly is ended. Intermittent sampling slices directly forward interference signals, a pulse pressure result shows as a false target group, three obvious false targets exist, the time intervals among the false targets are the same, the amplitude of the false targets is modulated by a sinker function, and it can be seen from a pulse pressure effect picture. A more effective interference effect can be generated by adopting an intermittent sampling and slicing direct forwarding mode, the difficulty of distinguishing true and false targets by the radar is increased, and the success rate of interference is improved.

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 direct 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 direct 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 direct 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 directly forwards the interference signal formed by the pulse signal with a slice width per sampling;

[0008] S3, repeat step S2 until the radar signal pulse received by the DRFM component ends.

[0009] Further, in step S2, the model of the interference signal is as follows:

[0010]

[0011] Where, T p is the pulse width of the transmitting signal, T J is the intermittent sampling slice width, TJ <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, s J is an interference signal.

[0012] 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, duty cycle, slice coverage, and transmission attenuation control parameters.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The intermittent sampling slice direct forwarding interference signal pulse pressure result of the present invention is manifested as a false target group, with 3 obvious false targets. The time intervals between the false targets are the same, and their amplitudes are modulated by the Sinker function. It can be seen from the pulse pressure effect diagram that the intermittent sampling slice direct forwarding method can produce a more effective interference effect, increase the difficulty of radar distinguishing true and false targets, and improve the success rate of interference.

[0015] (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 directly forwarding it by intermittent sampling for 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

[0016] Figure 1 This is a block diagram of the principle of interference signal generation in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the implementation principle of intermittent sampling slice direct forwarding interference in the DRFM component in the embodiment of the present invention;

[0018] Figure 3 It is a schematic diagram of the working principle of intermittent sampling slice direct forwarding interference in the present invention;

[0019] Figure 4 It is a time domain diagram of interference signals in the intermittent sampling slice direct forwarding interference implementation method of the present invention;

[0020] Figure 5 The pulse pressure result of the original signal and the intermittent sampling slices in the present invention directly forward the interference signal. DETAILED DESCRIPTION

[0021] 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.

[0022] Example

[0023] like Figure 1 As shown, the present invention discloses a method for realizing intermittent sampling slice direct 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.

[0024] After receiving the radar intermediate frequency signal and the interference strategy parameters, the DRFM component directly forwards the interference intermediate frequency signal through intermittent sampling slices. The implementation principle diagram of intermittent sampling slices directly forwarding interference is as follows: 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.

[0025] 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.

[0026] The specific implementation method of the present invention comprises the following steps:

[0027] 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, duty cycle, slice coverage, and transmission attenuation control parameters.

[0028] S2, the DRFM component samples the received radar intermediate frequency signal with a specified width, and directly forwards the interference signal formed by the pulse signal of each sampling slice width; wherein the model of the interference signal is as follows:

[0029]

[0030] Where, T p is the pulse width of the transmitting signal, 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, s J is an interference signal.

[0031] S3, repeat step S2 until the radar signal pulse received by the DRFM component ends.

[0032] 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 the original signal and the sliced ​​interference signal is as follows: Figure 4 shown.

[0033] Depend on Figure 5 It can be seen that the pulse pressure result of the intermittent sampling slice directly forwarding interference signal is manifested as a false target group. There are 3 obvious false targets. The time intervals between the false targets are the same, and their amplitudes are modulated by the Sinker function. It can be seen from the pulse pressure effect diagram that the intermittent sampling slice direct forwarding method can produce a more effective interference effect, increase the difficulty of radar distinguishing true and false targets, and improve the success rate of interference.

[0034] 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 direct 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 directly forwards the interference signal formed by the pulse signal with a slice width per sampling; S3, repeat step S2 until the radar signal pulse received by the DRFM component ends.

2. The method for implementing intermittent sampling slice direct forwarding interference based on DRFM technology according to claim 1 is characterized in that: In step S2, the model of the interference signal is as follows: Where, T p is the pulse width of the transmitting signal, 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, s J is an interference signal.

3. The method for implementing intermittent sampling slice direct 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, duty cycle, slice coverage, and transmission attenuation control parameters.

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