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A method and device for suppressing main lobe interference based on canonical correlation separation

A canonical correlation, main lobe interference technology, applied in the field of main lobe interference suppression based on canonical correlation separation, can solve problems such as inability to apply interference signals, increase system costs, and inability to suppress noise convolution interference, to improve anti-interference characteristics, achieve The effect of low cost and small amount of computation

Active Publication Date: 2022-06-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional anti-jamming technologies mainly include pulse-to-pulse waveform agility, cover pulse, frequency agility and other technologies that cannot effectively combat these interferences. These methods are usually only suitable for inter-pulse forwarding interference, and the above-mentioned common intermittent sampling and forwarding interference and Noise convolution jamming is that the jammer intercepts the radar signal and retransmits it quickly, and usually occurs within a pulse repetition period. Therefore, the traditional anti-jamming method is no longer applicable to the existing jamming signal
[0005] At present, the method of intra-pulse frequency coding is usually used to effectively suppress intermittent sampling interference, but this method cannot suppress noise convolution interference; in addition, this method needs to adopt segmented pulse pressure at the receiving end, which will greatly increase the system cost

Method used

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  • A method and device for suppressing main lobe interference based on canonical correlation separation
  • A method and device for suppressing main lobe interference based on canonical correlation separation
  • A method and device for suppressing main lobe interference based on canonical correlation separation

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Experimental program
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Effect test

Embodiment 1

[0057] See figure 1 , figure 1 It is a flowchart of a method for suppressing main lobe interference based on canonical correlation separation provided by an embodiment of the present invention, which includes:

[0058] Step 1: Acquire the radar echo signal.

[0059] In this embodiment, multiple receiving channels are used to receive echo data of radar signals, and the echo signals include target echo signals and interference signals.

[0060] Specifically, the transmitting signal of the radar adopts a linear frequency modulation signal, and its expression is:

[0061]

[0062] in,

[0063]

[0064] here, is the pulse width, is the pulse duration.

[0065] The echo of the target received by the radar receiver will be a complete transmitted signal, which can be expressed as:

[0066]

[0067] Represents the delay of the reflected electromagnetic wave from the target.

[0068] Further, the interference signal adopts intermittent sampling interference and no...

Embodiment 2

[0109] In order to further verify the beneficial effects of the present invention, a comparative description is given below through simulation experiments.

[0110] 1. Experimental conditions:

[0111] The interference signals used in this experiment are intermittent sampling forwarding interference and noise convolution interference. Among them, the number of points of intermittent sampling and forwarding interference in each sampling is 1 / 4 of a pulse, assuming that they are forwarded before and after the target. Noise convolution jamming is to convolve the entire radar transmit signal with Gaussian white noise. Other relevant parameters are shown in Table 1.

[0112]

[0113] 2. Experiment content and result analysis:

[0114] Experiment 1: The method of the present invention and the traditional PC radar are used to process the received radar echoes including target echoes and intermittent sampling and forwarding interference.

[0115] See Figure 4 , Figure 4 It is...

Embodiment 3

[0122] On the basis of Embodiment 1 above, this embodiment provides an apparatus for suppressing main lobe interference based on canonical correlation separation. See Figure 8 , Figure 8 It is a schematic structural diagram of a device for suppressing main lobe interference based on canonical correlation separation provided by an embodiment of the present invention, which includes:

[0123] A signal acquisition module 1, used for acquiring radar echo signals including interference signals;

[0124] The first separation module 2 is used to perform the first canonical correlation separation on the echo signal with the radar transmission signal as a reference;

[0125] The first pulse pressure module 3 is used to perform pulse pressure processing on the result of the first canonical correlation separation to obtain the first pulse pressure result;

[0126] A second separation module 4, configured to perform a second canonical correlation separation on the echo signal accordi...

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Abstract

The invention discloses a method for suppressing main lobe interference based on canonical correlation separation, which includes: obtaining radar echo signals; taking the radar transmitted signal as a reference, performing canonical correlation separation on the echo signals for the first time; The result of canonical correlation separation is subjected to pulse pressure processing to obtain the first pulse pressure result; the second canonical correlation separation is performed on the echo signal according to the first pulse pressure result; the second canonical correlation separation result is pulsed Press to get the target position. The present invention utilizes the good correlation between the echo signal and the known transmission signal, and achieves a good separation effect on the target signal and the interference signal in the echo signal through two canonical correlation separation methods, thereby improving the anti-interference characteristic, Moreover, the method has a small amount of computation, low system complexity, and low implementation cost.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method and device for main lobe interference suppression based on canonical correlation separation. Background technique [0002] With the continuous development of radar jamming technology, especially the emergence and development of digital radio frequency memory (DRFM), the types of jamming have been greatly expanded. By modulating and forwarding the intercepted radar transmission signal, DRFM can form an interference signal containing part of the radar transmission signal. In the radar receiver, these interference signals can also pass the pulse pressure smoothly because of the characteristics of part of the transmitted signal. Corresponding peaks will be formed at the position corresponding to the interference, so as to achieve the effect of interference and deception, thereby reducing the effective detection of the target by the radar. And bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/28G01S7/292
Inventor 王华柯刘成全英汇廖桂生
Owner XIDIAN UNIV