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Composite modulation signal recognition method based on CWD time-frequency analysis

A composite modulation and signal recognition technology, applied in the field of composite modulation signal recognition based on CWD time-frequency analysis, can solve the problem of pseudo-code phase modulation signal sensitivity, etc., and achieve the effect of good anti-noise performance and good recognition performance

Active Publication Date: 2019-08-16
HARBIN ENG UNIV
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Problems solved by technology

[0003] Aiming at the problems that the Linear Frequency Modulation (LFM) signal is simple in form and easy to be intercepted, and the pseudo-code phase modulation signal is sensitive to Doppler frequency shift, a new composite modulation signal of inter-pulse pseudo-code phase modulation and intra-pulse LFM is proposed.

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  • Composite modulation signal recognition method based on CWD time-frequency analysis
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  • Composite modulation signal recognition method based on CWD time-frequency analysis

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings.

[0064] The invention is applied to the intra-pulse type identification of radar signal pulses, and aims at constructing an intra-pulse identification scheme of multiple composite modulation signals. The intrapulse information of the input sampling signal is extracted and classified through the algorithm flow to extract the basic parameters.

[0065] Implementation scheme of the present invention: perform CWD time-frequency transformation on the pulse sampling signal, perform image morphology processing on the obtained time-frequency image, including binarization, closed operation and other operations, perform skeleton extraction on the processed image, and determine each The instantaneous frequency of the time sampling point; then perform Radon transformation on the bone image, and observe the transformation map mapped to the frequency axis direction to estimate the si...

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Abstract

The invention belongs to the field of in-pulse signal type recognition in information and communication engineering and particularly relates to a composite modulation signal recognition method based on CWD time-frequency analysis. According to the method, a CWD algorithm is utilized to perform time-frequency image analysis on pulse sampling signals, and classification recognition can be performedpertinently on multiple conventional signals and multiple composite modulation signals. Compared with an ordinary instantaneous phase method, short-time Fourier transformation and other time-frequencyanalysis methods, the method has better anti-noise performance and also has good recognition performance under a low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the field of intrapulse signal type identification of information and communication engineering, and in particular relates to a compound modulation signal identification method based on CWD time-frequency analysis. Background technique [0002] In recent years, radars have put forward higher requirements for range velocity resolution, speed measurement and ranging accuracy, anti-jamming performance and low intercept probability. The traditional single modulation signal can no longer meet these requirements, so the composite modulation signal is becoming more and more research hotspot. Common composite modulation signals include frequency code and phase code composite (FSK_BPSK) signal, pseudocode-linear frequency modulation composite (LFM_BPSK) signal. FSK_BPSK has good signal sidelobe compression performance and high range resolution, and has received extensive attention in radar and other fields. [0003] Aiming at the prob...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/10G01S7/285G01S7/292
CPCG01S13/10G01S7/285G01S7/292Y02D30/70
Inventor 陈涛雷宇郭立民黄湘松潘大鹏
Owner HARBIN ENG UNIV
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