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Method for detecting LFM signal under low signal-to-noise ratio

A technology with low signal-to-noise ratio and detection method, applied in the field of communication, can solve the problems of no threshold setting method and unsatisfactory detection performance.

Inactive Publication Date: 2015-10-28
XIDIAN UNIV
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Problems solved by technology

Based on the idea of ​​Wigner-Hough transform and generalized likelihood ratio test theory, Liu Jiancheng et al. analyzed the detection performance of chirp signal under double-threshold conditions, and gave the mathematical expressions of false alarm probability and detection probability, but did not give specific The detection performance is not ideal (Liu Jiancheng, Wang Xuesong. Analysis of LFM signal detection performance based on Wigner-Hough transform[J]. Electronic Journal, 2007,35(6):1212-1217.)

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  • Method for detecting LFM signal under low signal-to-noise ratio
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  • Method for detecting LFM signal under low signal-to-noise ratio

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[0047] Concrete implementation steps of the present invention are as follows:

[0048] Such as figure 1 As shown, the present invention is a detection method of LFM signal under a kind of low signal-to-noise ratio, and described method comprises the following steps:

[0049] S1 performs the short-time Fourier transform of the linear regular domain on the received LFM signal, and obtains the short-time Fourier transform spectrum of the linear regular domain;

[0050] It should be noted that the short-time Fourier transform of the linear regular domain of the received LFM signal is performed as follows:

[0051] 1.1) The LFM signal model is expressed as:

[0052] f ( t ) = A 0 exp ( j ( f 0 t + 1 ...

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Abstract

Provided is a method for detecting a LFM signal under a low signal-to-noise ratio. The method comprises the following steps of: performing short-time Fourier transform (STFT) in a linear regular regin on a received LFM signal so as to obtain a STFT spectrum of the LFM signal in the linear regular regin; performing Hough transformation on the STFT spectrum in the linear regular regin; performing traversal on a matrix subjected to the Hough transformation by using a two-dimensional sliding window and performing energy accumulation in the sidling window so as to obtain a test statistic; and obtaining an optimal decision threshold according to a receiver operating characteristic curve (ROC) in order to detect the LFM signal. The method has a good detection performance on the LFM signal in a low signal-to-noise ratio environment.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a detection method of an LFM signal under a low signal-to-noise ratio, which can be used for detecting the LFM signal under a low signal-to-noise ratio environment. Background technique [0002] Linear frequency modulated (LFM) signals are widely used in information systems such as communications, radar, sonar, and seismic surveys. In the field of radar countermeasures, chirp radar signal is widely used as a mature low probability of intercept radar signal. Therefore, it is meaningful and valuable to study the detection of LFM signals under low signal-to-noise ratio. [0003] There are many methods for detecting LFM signals. The time-frequency representation methods commonly used in linear frequency modulation signal detection include linear time-frequency distribution and quadratic time-frequency distribution. Linear time-frequency distributions mainly includ...

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Application Information

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IPC IPC(8): H04B17/318H04L25/02H04L25/03
Inventor 李兵兵刘明骞胡晔
Owner XIDIAN UNIV
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