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Single-frequency pulse signal detection method

A technology of pulse signal and detection method, applied in the field of signal processing, can solve the problems of increasing frequency estimation error, limited pulse width of pulse signal, influence of other frequencies, etc., to eliminate frequency ambiguity, enhance peak value, and increase output signal-to-noise ratio Effect

Pending Publication Date: 2022-05-13
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

The pulse width of the pulse signal is limited, and it can be regarded as an infinitely long single-frequency signal with windowing in the time domain. Therefore, direct Fourier transform will cause the signal frequency band to broaden and cause frequency ambiguity, resolution reduction, and frequency estimation error. At the same time, the conventional method pulse Energy leaks to other frequency points to generate side lobes, which affect other frequencies

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  • Single-frequency pulse signal detection method
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  • Single-frequency pulse signal detection method

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Embodiment Construction

[0026] In order to make the technical means of the present invention and the technical effects that can be achieved more clearly and more perfectly disclosed, the following embodiments are provided hereby, and the following detailed descriptions are made in conjunction with the accompanying drawings:

[0027] see figure 1 , a single-frequency pulse signal detection method of the present embodiment, comprising the following:

[0028] Step 1, receiving a signal;

[0029] Step 2. Segment the received signal according to the pulse width, and each segmented signal x i The length of N is to ensure that the pulse signal exists completely in a certain segment of the signal, and at the same time the data cannot be too long to ensure the signal-to-noise ratio of the signal; there must be a certain overlap between adjacent signal segments to prevent the pulse signal from being truncated while retaining Certain historical information. In engineering, the length of the signal segment is...

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Abstract

The invention relates to the technical field of signal processing, in particular to a single-frequency pulse signal detection method, which comprises the following steps: receiving a signal; segmenting the received signal according to the pulse width, wherein the length of each segment of signal xi after segmentation is N; performing Fourier transform on each segment of data; calculating discrete Fourier transform of a rectangular window signal equal to the pulse width, wherein the Fourier transform length is N; then carrying out deconvolution to obtain a signal spectrum; setting a detection threshold value, detecting a signal frequency spectrum, searching a signal frequency spectrum peak value, and when the peak value is greater than the detection threshold value, determining that a single-frequency pulse signal is detected. According to the method, a deconvolution method is used for carrying out deconvolution operation on the spectrum of the signal, the peak value of the spectrum of the single-frequency pulse signal is enhanced, frequency ambiguity and sidelobe leakage are eliminated, and the subsequent detection probability is improved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a single-frequency pulse signal detection method. Background technique [0002] Single-frequency pulse signal is easy to generate and transmit, simple in structure, and easy to analyze and process. It is one of the most in-depth research and most widely used signal forms. Single-frequency pulse signal detection is widely used in radar, sonar, communication, medical and other fields. Because of its narrow bandwidth, the single-frequency pulse signal is susceptible to frequency deviation caused by transmission, reception and medium movement, so it is difficult to use pulse compression technology for detection. The existing conventional methods in engineering generally use Fourier transform of the received signal, and search for the peak value near its given frequency to detect the signal. The pulse width of the pulse signal is limited, and it can be regarded as an infin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/12G01R23/16
CPCG01R23/12G01R23/16
Inventor 查继林王方勇唐浩尚金涛
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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