Method and device for separating main lobe interference suppression based on canonical correlation

A technology of canonical correlation and main lobe interference, which is applied in the field of main lobe interference suppression based on canonical correlation separation, can solve the problems of inapplicable interference signals, increased system cost, and inability to suppress noise convolution interference, so as to improve anti-interference characteristics and realize The effect of low cost and small amount of computation

Active Publication Date: 2022-04-05
XIDIAN UNIV
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  • Description
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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 Therefore, the traditional anti-jamming method is no longer applicable to the existing jamming signal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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  • Method and device for separating main lobe interference suppression based on canonical correlation
  • Method and device for separating main lobe interference suppression based on canonical correlation
  • Method and device for separating main lobe interference suppression based on canonical correlation

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Experimental program
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Effect test

Embodiment 1

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

[0058] Step 1: Get 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 transmission 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 received by the radar receiver from the target will be a complete transmitted signal, which can be expressed as:

[0066]

[0067] Indicates the delay of the electromagnetic wave reflected by the target.

[0068] Further, the interference signal adopts intermittent sampling interference and noise c...

Embodiment 2

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

[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 intermittent sampling and forwarding interference points per sampling is 1 / 4 of a pulse, assuming that they are forwarded to the front and back of the target. Noise convolution jamming is to convolve the entire radar transmitted signal with Gaussian white noise. See Table 1 for other relevant parameters.

[0112]

[0113] 2. Experimental 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 ...

Embodiment 3

[0122] On the basis of the first embodiment above, this embodiment provides a device 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 mainlobe interference based on canonical correlation separation provided by an embodiment of the present invention, which includes:

[0123] A signal acquisition module 1, configured to acquire radar echo signals including interference signals;

[0124] The first separation module 2 is configured to perform canonical correlation separation on the echo signal for the first time by using 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] The second separation module 4 is configured to perform a second canonical correlation separati...

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Abstract

The invention discloses a canonical correlation separation main lobe interference suppression-based method. The method comprises the steps of obtaining a radar echo signal; carrying out first canonical correlation separation on the echo signal by taking a radar transmitting signal as a reference; performing pulse pressure processing on the result of the first canonical correlation separation to obtain a first pulse pressure result; performing second canonical correlation separation on the echo signal according to the first pulse pressure result; and performing pulse pressure processing on a result of the second canonical correlation separation to obtain a target position. According to the method, good correlation between the echo signal and the known emission signal is utilized, a good separation effect is achieved on the target signal and the interference signal in the echo signal through a two-time canonical correlation separation method, and therefore the anti-interference characteristic is improved, and the method is small in calculation amount, low in system complexity and low in 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 suppressing main lobe interference 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 through the pulse pressure smoothly because they have the characteristics of a part of the transmission signal. A corresponding peak will be formed at the position corresponding to the interference, so as to achieve the effect of interference and deception, so as to reduce the effective detection of the target by t...

Claims

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Application Information

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