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

Abstract

The present invention discloses a method for implementing intermittent sampling slice repeated forwarding interference based on DRFM technology, which mainly solves the problem that traditional interference implementation methods often cannot produce effective interference effects for new system radars with large time width, rich anti-interference means and changeable waveforms. The method includes the following steps: 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; S2, the DRFM component samples the received radar intermediate frequency signal, and repeatedly forwards the sampled slices to obtain a reconstructed interference signal; S3, repeating step S2 until the radar signal pulse received by the DRFM component ends. The repeated forwarding of the present invention is relatively simple for system control, and the processing time is longer than direct forwarding. Moreover, since the pulse segments sampled at the current time are forwarded, the last sampled segment can be deleted at the next sampling, which reduces the system's requirements for storage space.

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 repeated 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 repeated 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 repeated 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 according to the set parameters, and the sampled slices are repeatedly forwarded according to the set forwarding number parameters to obtain the reconstructed interference signal;

[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:

[0010]

[0011] Where, T p is the pulse width of the transmitting signal, T Jis the intermittent sampling slice width, T J <T p , (M+1)T J represents the interval between two samplings of the dry DRFM component, 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, forwarding times, slice coverage, and transmission attenuation control parameters.

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

[0014] (1) The pulse pressure results of the intermittent sampling slice repeated forwarding interference signal of the present invention are manifested as multiple false target groups. The number of false target groups is related to the number of forwarding times. It can be seen from the pulse pressure effect diagram that the method of intermittent sampling slice repeated forwarding can increase the interference coverage range, and the false targets generated under certain conditions are also fluctuating. Compared with direct forwarding interference, repeated forwarding interference can generate more false targets. From the perspective of hardware implementation and system processing time, repeated forwarding is relatively simple for system control, and the processing time is longer than direct forwarding. Moreover, since the pulse segments sampled at the time are forwarded, the last sampled segment can be deleted at the next sampling, which reduces the system's requirements for storage space.

[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 retransmitting it by intermittent sampling. 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. By adjusting parameters such as slice width, slice mode, and slice delay, it can simulate complex multi-false target scenarios, 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 repetitive forwarding interference in the DRFM component of an embodiment of the present invention.

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

[0019] Figure 4 It is a time domain diagram of the interference signal of the intermittent sampling slice repeated forwarding interference implementation method in the present invention.

[0020] Figure 5 It is the pulse compression result of the original signal and the intermittent sampling slices repeatedly forwarding the interference signal in the present invention. 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 repeated 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 generates an interference intermediate frequency signal after repeated forwarding through intermittent sampling slices. The implementation principle diagram of intermittent sampling slice repeated 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.

[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, forwarding times, slice coverage, and transmission attenuation control parameters.

[0028] S2, the DRFM component samples the received radar intermediate frequency signal, and repeatedly forwards the sampled slices to obtain a reconstructed interference signal; the model of the interference signal is:

[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 , (M+1)T J represents the interval between two samplings of the dry DRFM component, 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. Where M represents the set number of repeated forwarding times. When M = 1, repeated forwarding is equivalent to direct forwarding. Assume that the radar transmits a linear frequency modulation signal with a signal pulse width of T p =100μs, bandwidth B = 10MHz, sampling frequency is 2400MHz, intermittent sampling pulse width T J =5μs, the intermittent sampling period is 4*T J , the number of forwarding times M = 3. The time domain diagram of intermittent sampling slices repeatedly forwarding interference signals is shown in Figure 4 shown.

[0033] Depend on Figure 5 It can be seen that the pulse compression result of intermittent sampling slices and repeated forwarding interference signals is manifested as the generation of three false target groups. The number of false target groups is related to the number of forwarding times. From the pulse compression effect diagram, it can be seen that the method of repeated forwarding of intermittent sampling slices can increase the interference coverage, and the false targets generated under certain conditions are also fluctuating. Compared with direct forwarding interference, repeated forwarding interference can generate more false targets. From the perspective of hardware implementation and system processing time, repeated forwarding is relatively simple for system control, and the processing time is longer than direct forwarding. Moreover, since the forwarded pulse segments are the pulse segments of the current sampling, the last sampling segment can be deleted in the next sampling, which reduces the system's requirements for storage space.

[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 repeated 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 according to the set parameters, and the sampled slices are repeatedly forwarded according to the set forwarding number parameters to obtain the reconstructed interference signal; S3, repeat step S2 until the radar signal pulse received by the DRFM component ends.

2. The method for implementing intermittent sampling slice repeated forwarding interference based on DRFM technology according to claim 1 is characterized in that: In step S2, the model of the interference signal is: Where, T p is the pulse width of the transmitting signal, T J is the intermittent sampling slice width, T J <T p , (M+1)T J represents the interval between two samplings of the dry DRFM component, 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 repeated 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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