Sea target intelligent detection method based on time-frequency three-feature extraction
A feature extraction and intelligent detection technology, applied in the field of radar, can solve the problems of insufficient recognition accuracy and achieve high accuracy and detection efficiency
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[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0039] Step 1: time-frequency two-dimensional transformation;
[0040] Assuming that the radar echo signal to be tested is expressed as x(n), its short-time Fourier transform is expressed as:
[0041]
[0042] Among them, n and k are the number of discrete time sampling and discrete frequency sampling; h is the window function, using the Hamming window; m is the window length; N is the number of Fourier transform points;
[0043] Step 2: time-frequency feature extraction;
[0044] Firstly, the spectral function value in each time slice is accumulated along the time axis of the short-time Fourier transform, and the spectral function value T_E of the nth time slice is calculated n :
[0045]
[0046] The total short-time Fourier transform spectral function value E of the time-frequency plane is:
[0047]
[0048] On this basis, the following ...
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