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Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing

A noise radar and broadband frequency modulation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of reducing the sampling rate, storage capacity and transmission capacity of radar receivers

Inactive Publication Date: 2012-07-25
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0007] The object of the present invention is, in order to solve the above-mentioned problem, thereby provide a kind of broadband FM step noise radar signal processing method based on compressed se

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  • Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing
  • Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing
  • Wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing

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Embodiment Construction

[0047] In order to better understand the technical solutions of the present invention, the implementation manners of the present invention will be further described below in conjunction with the accompanying drawings.

[0048] Such as figure 1 as shown, figure 1 It is a flowchart of a wideband FM step noise radar signal processing method based on compressed sensing proposed by the present invention. The specific steps of the method include:

[0049] Step 1): at first produce initial noise sequence by noise signal source, the present invention adopts improved Logistic-Map chaotic mapping to produce initial noise sequence, and its mathematical model following formula (1) represents:

[0050] x i+1 =f(x i )=1-2·(x i ) 2 x i ∈(-1,1) (1)

[0051] Intercept sub-pulse sequences in the initial noise sequence, perform band-pass filtering on each sub-pulse sequence, and obtain a new noise sequence with a bandwidth of B, and use Hilbert transform to obtain I / Q two-way noise ...

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Abstract

The invention relates to a wideband frequency-modulation stepping noise radar signal processing method based on compressive sensing. The method comprises the following step of combining a noise signal, a frequency steeping signal and the compressive sensing, so that the method combines advantages of the noise signal, the frequency steeping signal and the compressive sensing, keeps the advantages of frequency stepping signal narrowband treatment, and also has the features of low intercept probability of the noise signal, interference resistance, and good electromagnetic compatibility; and meanwhile, the method also combines the compressive sensing to obtain a high-resolution image by utilizing a low data amount. According to the method disclosed by the invention, under the condition that an observation target is sparse, the requirements of (ultra) wideband signals on receiver A/D (Analogue to Digital) sampling, storage and transmission equipment are reduced and the method is easy to realize, so that the wideband frequency-modulation stepping noise radar signal processing method based on the compressive sensing has important real meaning to an actual system.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a method for processing wideband FM step noise radar signals based on compressed sensing. Background technique [0002] High resolution radars usually use (ultra) wideband signals in order to obtain high resolution over range. In broadband radar signals, the proposal of Stepped Frequency Continuous Waveforms (SFCW) and Stepped Frequency Chirp Signal (SFCS) (Wehner D.R. High-resolution radar.2nd edition, Norwood , MA: Artech House, 1995, Chapter 5. Nadav L. "Stepped-frequency pulse-train radar signal". IEE Proc-Radar SonarNavigation, 2002, 149(6): 198-309. Maron D.E. "Non-periodic frequency- Jumped burst waveforms”. Proceedings of the IEE International Radar Conference, London, Oct. 1987, 484-488. Maron D.E. “Frequency-jumped burst waveforms with stretch processing”. IEEE Radar Conference, Piscataway: IEEE Press, 1990, 274-279. ), providing a new technical approa...

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Application Information

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IPC IPC(8): G01S7/285
Inventor 张云华董晓顾翔
Owner NAT SPACE SCI CENT CAS
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