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Broadband digital channelization method based on signal third-order phase difference

A digital channelization and phase difference technology, applied in signal detection and digital channelization receivers, radar countermeasure fields, can solve the problem of difficult to select amplitude detection threshold detection and other problems

Active Publication Date: 2019-07-05
湖南红船科技有限公司
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Problems solved by technology

This is obviously inappropriate for wideband receivers with large instantaneous dynamic range. Under large instantaneous dynamics, the interference of strong signals to weak signals cannot be underestimated, which makes it difficult to select the amplitude detection threshold to detect strong and weak signals.

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Embodiment Construction

[0075] The present invention mainly adopts the method of simulation experiment to verify the feasibility of the scheme, and all steps and conclusions are verified correctly on MATLAB R2010a. The specific implementation steps are as follows:

[0076] Step 1: Initialize parameters

[0077] The ADC sampling rate is 1.0GHz, the number of channels in the simulation is M=64, the filter order is L=384, and the number of coefficients of each polyphase filter is N=6;

[0078] Divide the input signal s(t) into three times

[0079] The first input s(t) is a single frequency signal A is the signal amplitude, f 0 is the signal carrier frequency, is the initial phase of the signal,

[0080] The second input signal s(t) is a chirp signal A is the signal amplitude, τ pulse interval time, f 0 Signal carrier frequency, μ modulation frequency,

[0081] The third input signal s(t) is BPSK signal s(t)=Acos(2πf 0 t+φ n ), A is the signal amplitude, f 0 is the signal carrier frequency,...

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Abstract

The invention relates to a broadband digital channelization method based on a signal third-order phase difference. A digital channelization design of multiple phase differential detection is used, thedifferential detection is adopted so that a signal detection threshold is normalized, therefore, detection of large instantaneous dynamic signals is realized, and subsequent phase refinement processing of the signals can be conveniently performed and in-pulse analysis of the signals is realized. A difference can be used to realize identification of fine frequency measurement of the signal and a phase-coded signal. An adaptive problem that a multi-channel digital receiver is difficult to achieve a threshold when a signal dynamic range is large is solved.

Description

technical field [0001] The invention belongs to the technical field of radar countermeasures, in particular to the technical fields of signal detection and digital channelized receivers. Background technique [0002] Wideband reconnaissance receivers play an important role in electronic countermeasures. With the rapid development of digital signal processing technology and corresponding device levels, digital reconnaissance receivers have attracted more and more attention because of their advantages such as small equipment, flexible algorithms, and easy expansion of functions. On the modern battlefield, the signal environment is dense and complex. The instantaneous bandwidth of narrowband radar signals is generally on the order of several MHz, and the instantaneous bandwidth of ultra-wideband radar signals is hundreds of MHz or even above 1GHz. Therefore, higher requirements are proposed for wideband reconnaissance receivers. Generally, it is required that the instantaneous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S7/36
CPCG01S7/292G01S7/36
Inventor 朱二洁覃春妮刘玲玲
Owner 湖南红船科技有限公司
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