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Method and device for detecting complex radar pulse envelope signal with low signal-to-noise ratio

A technology of envelope signal and radar pulse, applied in the field of radar signal reconnaissance, can solve the problem of signal submerged in noise, unable to judge signal defect, etc., and achieve the effect of reducing the number of channels, improving the signal-to-noise ratio, and reducing the noise energy.

Active Publication Date: 2019-07-16
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that when the signal-to-noise ratio is low in the prior art, the signal is often submerged in the noise, and it is impossible to judge whether there is a signal defect, and to provide a method and device for detecting a complex radar pulse envelope signal with a low signal-to-noise ratio. solve the above problems

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  • Method and device for detecting complex radar pulse envelope signal with low signal-to-noise ratio
  • Method and device for detecting complex radar pulse envelope signal with low signal-to-noise ratio
  • Method and device for detecting complex radar pulse envelope signal with low signal-to-noise ratio

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Embodiment 1

[0038] like figure 1 As shown, the low SNR complex radar pulse envelope signal detection device of the present invention includes a digital channelization module 1 , a signal envelope extraction module 2 , an envelope correction module 3 based on channel numbers and a dual-threshold pulse detection module 4 .

[0039] The digital channelization module (1) performs channelization processing on the external radar signal, divides the original full-band signal into multiple sub-band signals, and sends the multiple sub-frequency signal bands to the signal envelope extraction module (2);

[0040] The signal envelope extraction module 2 first calculates the signals of multiple sub-bands respectively, converts them into multi-channel signal amplitudes, and then extracts the maximum value of the signal amplitudes at the same time point to form a signal envelope, and transmits the signal envelope to the envelope correction Module 3;

[0041] The envelope correction module 3 corrects th...

Embodiment 2

[0044] A method for detecting a complex radar pulse envelope signal with a low signal-to-noise ratio, comprising the following steps:

[0045] Step 1. Channelize the external radar signal

[0046] Channelize the external radar signal and split the original full-band signal into multiple sub-band signals.

[0047] The digital channelization module 1 uses a group of band-pass filter banks with the same performance on the input radar signal to divide the original full-band signal into multiple sub-band signals. There is an efficient implementation method for digital channelization, that is, the channelization structure based on polyphase filter banks, such as figure 2 shown. The figure shows the polyphase filter structure of even arrangement and critical decimation of complex signals. The main process is to perform D times decimation on the input signal, then filter the extracted signal, and finally output D channel sample points through D point FFT.

[0048] Step 2. Signal e...

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Abstract

The embodiment of the invention discloses a low-signal-to-noise-ratio complex radar pulse envelope signal detection method and device. The device includes a digital channelization module, a signal envelope extraction module, a channel number-based envelope correction module and a double-threshold pulse detection module. First an input radar signal is subjected to channelization processing, and noise outside a channel is filtered; then a multipath channel signal envelope is extracted; then the signal envelope is corrected; and finally, a double-threshold pulse detection algorithm is adopted to ensure that a complete complex radar pulse signal is detected.

Description

technical field [0001] The invention relates to the technical field of radar signal reconnaissance in electronic reconnaissance, in particular to a method and device for detecting complex radar pulse envelope signals with low signal-to-noise ratio. Background technique [0002] In electronic reconnaissance, real-time detection of the opponent's radar signal is a very important issue. Only when the radar signal is detected correctly can it be processed. Otherwise, useful signals will be missed and the opportunity to find the opponent's radar will be missed. Generally, when the signal-to-noise ratio is high, the energy difference between the signal and the noise is large, and whether there is a signal can be judged by comparing the input signal with a preset threshold. If the signal is greater than the threshold, there is a signal; otherwise, there is no signal. However, when the signal-to-noise ratio is low, the signal is often submerged in the noise, and it is impossible to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02
CPCG01S7/021
Inventor 郭芝源王镪李臻潘玉静黄穗
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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