Patent ID: 11906616
Assignee: XIDIAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 1:
2. The method according to claim 1, wherein a CLEAN algorithm is used in (2) to remove ground clutter in the original Range Doppler RD map of the targets as follows:
(2a) For each line of the RD map, finding out a ground clutter area and a number of Doppler cells contained in the ground clutter area adaptively, and smoothing these Doppler cells;
(2b) Performing IFFT operation on each line of the RD map to obtain a raw radar echo of the line, and obtaining the number of Doppler cells contained in the ground clutter area of the line through (2a);
(2c) Estimating clutter energy in the radar echo according to radar parameters, performing discrete Fourier transform on the raw radar echo obtained in (2b) to obtain a Doppler spectrum of an echo signal, searching the Doppler spectrum for the maximum value of the ground clutter area mentioned in (2a) and its corresponding phase, amplitude and Doppler frequency, and reconstructing a time-domain signal corresponding to the maximum value of the ground clutter area;
(2d) Using a raw echo signal obtained in (2b) to subtract the time-domain signal corresponding to the maximum value of the reconstructed ground clutter area in (2c), so as to obtain a processed echo signal, and calculating the energy of the processed echo signal in the ground clutter area;
(2e) Determining whether the energy of the processed echo signal in the clutter area is less than the estimated clutter energy in (2c); if so, obtaining the radar echo signal after the clutter removal in each row; otherwise returning to (2c);
(2f) Performing the FFT operation on the radar echo signal obtained in (2e) which has ground clutter removed in each line, and obtaining the RD map with ground clutter removed.