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Method for acquiring wide-band frequency modulation stepped chaos radar signal

A technology of radar signal and broadband frequency modulation, applied to radio wave measurement systems, instruments, etc., can solve the problems of limiting radar imaging resolution and chaotic signal bandwidth is not very high

Inactive Publication Date: 2012-05-30
NAT SPACE SCI CENT CAS
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  • Abstract
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Problems solved by technology

[0005] The direct generation of (ultra) wideband chaotic signals has high requirements for hardware implementation and use environment. In the relevant literature that can be consulted at present (K.A.Lukin, A.A.Mogyla etc. "Ka-band bistatic ground-based noise waveform SAR for short- range applications", IET Radar Sonar Navig, 2008, Vol.2, No.4, pp.233-243; D.Tarchi, K.Lukin, etc. "SAR Imaging with Noise Radar", IEEETransactions on Aerospace and Electronic Systems vol .46, no.3July 2010, pp.1214-1225), basically use the direct method to generate (ultra) wideband chaotic signals, but, because the increase of the signal bandwidth will bring great pressure to the detection of the receiver, at this time Higher-speed A / D converters and higher-speed data storage are required. In the current work reported publicly, the bandwidth of the chaotic signal is not very high, which greatly limits the imaging resolution of the radar.

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  • Method for acquiring wide-band frequency modulation stepped chaos radar signal
  • Method for acquiring wide-band frequency modulation stepped chaos radar signal
  • Method for acquiring wide-band frequency modulation stepped chaos radar signal

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Embodiment Construction

[0042] 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.

[0043] figure 1 It is a flow chart of a method for obtaining broadband FM stepped chaotic radar signals proposed by the present invention. The specific steps of the method include:

[0044] Step 1): Using the improved Logistic-Map chaotic map to generate the initial chaotic sequence, image 3 The initial chaotic sequence graph generated for the improved Logistic-Map chaotic map; Figure 4 The initial chaotic sequence power spectrum generated for the improved Logistic-Map chaotic map; such as image 3 and Figure 4 As shown, the initial chaotic sequence mean=0.00029165, variance=0.49988. Its mathematical model is represented by the following formula (1):

[0045] x i+1 =f(x i )=1-2·(x i ) 2 x i ∈(-1,1) (1)

[0046] Define the length M of the sub-pu...

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Abstract

The invention relates to a method for acquiring a wide-band frequency modulation stepped chaos radar signal, which comprises the following steps: acquiring an echo baseband signal rn(t) of each subpulse; then, correspondingly carrying out matched filtering or correlation processing on the baseband echo signal rn(t) of each subpulse and the respective baseband chaos sequence, thus obtaining a frequency domain signal Un(f) of each subpulse; carrying spectral migration on the frequency domain signal Un(f) of each subpulse, and then carrying out de-overlapping and phase compensation, wherein the frequency shift quantity of the spectral migration is equal to the frequency interval DELTAf of a local frequency source; and carrying out coherence stack on the subpulse signal subjected to de-overlapping and phase compensation, thus obtaining a synthesized large wide-band signal, wherein the band width of the synthesized wide-band signal is B+(N-1)DELTAf. The invention provides a new technical route for realizing a chaos radar signal having an ultra large band width. By combining the chaos signal and the frequency stepped signal, the advantages of the both are combined. The method provided by the invention is simple and clear, is easy to realize, is applicable to frequency linear / nonlinear stepping and has important practical meanings in an actual system.

Description

technical field [0001] The invention relates to the field of radar anti-jamming signal design technology and radar signal processing technology, in particular to a method for obtaining broadband frequency modulation step chaotic radar signals. 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 Sonar Navigation, 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 RadarConference, Piscataway: IEEE Press, 1990, 274-...

Claims

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Application Information

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IPC IPC(8): G01S7/28G01S7/36
Inventor 顾翔张云华张祥坤翟文帅石晓进陈秀伟
Owner NAT SPACE SCI CENT CAS
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