Line spectrum detection method by coherent accumulation of frequency domains

A technology of coherent accumulation and detection method, applied in the field of online spectral signal detection, can solve problems such as large impact on algorithm performance

Inactive Publication Date: 2012-02-15
HARBIN ENG UNIV
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Problems solved by technology

This algorithm solves the problems in line spectrum detection such as breakpoints in the middle of spectral lines and random noise point interference, and improves the abili

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  • Line spectrum detection method by coherent accumulation of frequency domains
  • Line spectrum detection method by coherent accumulation of frequency domains
  • Line spectrum detection method by coherent accumulation of frequency domains

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Embodiment Construction

[0022] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0023] combine figure 1 , the specific content of the present invention is as follows:

[0024] In the first step, according to the time-correlation characteristics of the signal field and the noise field, the received signal x(t) is segmented, so that there is a delay between each segment of the signal, and the delay is greater than the correlation radius of the noise and smaller than the correlation radius of the signal radius. Assuming that the original received signal is x(t), the delay amount τ of each data segment is smaller than the time correlation radius τ of the signal s , which is larger than the time-correlation radius τ of the noise n ,Right now

[0025] τ n TN τ TN τ s

[0026] Then the data of the i segment is

[0027]

[0028]

[0029] in,

[0030] In the second step, in order to obtain a smooth spectrum estimate, each signal seg...

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Abstract

The invention provides a line spectrum detection method by coherent accumulation of frequency domains. According to the invention, the method comprises the following steps that: step one, on the basis of time correlation characteristics of a signal field and a noise field, segment processing is carried out on a receiving signal, so that there are time delays between all segments of the signal and a time delay amount is greater than a correlation radius of the noise and is less than a correlation radius of the signal; step two, each the signal segment is internally divided into a plurality of sub data segments and it is allowed that there are overlapping parts of data of all the segments; step three, time delay compensation is carried out on the signal; step four, signals of all the segments are accumulated to obtain an output signal of coherent accumulation; step five, power equalization is carried out on outputs of all correlation accumulations, so that a power spectrum estimated by the method provided in the invention is obtained. According to the invention, coherence of signals is utilized; and phase compensation is carried out on signals, wherein there are time delay differences between all the signals; therefore, same phase addition of the signals is formed; however, because the phase of the noise is random, there is no formed same phase addition for the noise, so that a detection capability on a weak signal can be improved.

Description

technical field [0001] The invention relates to an underwater acoustic signal processing method, in particular to a line spectrum signal detection method. Background technique [0002] Passive sonar detects the target and distinguishes the type of the target based on the radiation noise emitted by the target when it is sailing. High-quality spectral estimation of line spectra will provide an important basis for target recognition. The detection and extraction of line spectrum has always been the focus of research at home and abroad. Currently, line spectrum detection is usually performed based on the calculated spectral values ​​of the periodogram. Line spectrum detection methods are divided into two categories: real-time detection methods using spectral values ​​at a single time point and decision-making methods using multiple time point data to delay decision-making. [0003] The most classic method of line spectrum detection is to directly process the signal received i...

Claims

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Application Information

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IPC IPC(8): G01S7/539
Inventor 朴胜春刘佳张海刚袁冬石珺
Owner HARBIN ENG UNIV
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