Radar signal identification method based on singular value decomposition of time-frequency distribution

A singular value decomposition and time-frequency distribution technology, applied in the field of communication, can solve the problems of low recognition rate of radar signals and inability to realize effective recognition of radar signals, so as to improve the classification performance, overcome the small number of marked samples, and overcome the problems of radar signal recognition low rate effect

Inactive Publication Date: 2018-07-13
XIDIAN UNIV
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Problems solved by technology

The disadvantage of this method is that when the signal-to-noise ratio is low, this method cannot realize the effective identification of radar signals
The disadvantage of this method is that due to the limitation of the uncertainty principle, the time-frequency resolution of wavelet transform cannot be arbitrarily small, and for multi-chirp signals, the radar signal recognition rate is low under the condition of low signal-to-noise ratio.

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  • Radar signal identification method based on singular value decomposition of time-frequency distribution
  • Radar signal identification method based on singular value decomposition of time-frequency distribution
  • Radar signal identification method based on singular value decomposition of time-frequency distribution

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[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] Refer to attached figure 1 , the specific steps of the present invention are further described in detail.

[0041] Step 1, the electronic reconnaissance receiver receives the radar high-frequency pulse signal in real time.

[0042] Step 2, preprocessing.

[0043] Using a low-pass filter, the radar high-frequency pulse signal is converted into an intermediate frequency signal.

[0044] Perform A / D sampling processing on the intermediate frequency signal to obtain the observation signal.

[0045] Step 3, calculate the radial Gaussian kernel time-frequency distribution of the observed signal.

[0046] Calculate the time-frequency value of each observed signal at each sampling time and each sampling frequency according to the following formula:

[0047]

[0048] Among them, P i (t, ω) represents the time-frequency value of the i-th observed signal...

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Abstract

The invention discloses a radar signal identification method based on the singular value decomposition of time-frequency distribution. The method mainly solves the problem that in the prior art, the recognition rate of a radar signals is low under the condition of the low signal-to-noise ratio. The method comprises the following steps of (1) receiving a radar high-frequency pulse signal in real time by an electronic reconnaissance receiver; (2) preprocessing; (3) calculating the radial Gaussian kernel time-frequency distribution of signals; (4) extracting characteristic values; (5) classifyingand identifying. The characteristic values of radar signals are extracted based on the singular value decomposition of time-frequency distribution, so that the influence of noises is effectively eliminated. The method is self-adaptively applicable to various types of signals. target radar signals can be classified and identified under the condition of the low signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a radar signal recognition method based on SVD (Singular Value Decomposition) of time-frequency distribution in the technical field of signal recognition. The invention uses part of the prior information of the received radar signal to detect, analyze and identify the target radar signal. Background technique [0002] The time-frequency distribution reflects the change law of the signal in the time domain and frequency domain, and is a powerful tool for analyzing non-stationary signals. Radar signal is a kind of non-stationary signal, and the time-frequency analysis method is used to extract the characteristics of the signal pulse to realize the recognition of radar signal. The radar signal received in a complex electromagnetic environment, due to the low signal-to-noise ratio, the time-frequency distribution of the radar signal will be seriously distorted, and the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/62
CPCG06F2218/04G06F2218/08G06F2218/12G06F18/2411
Inventor 吴莹杨磊
Owner XIDIAN UNIV
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