Micro-motion Signature Extraction Method for Wideband Radar Based on Complex Image OMP Decomposition
Luo Ying① Zhang Qun① Wang Guo-zheng② Guan Hua① Bai You-qing②
①(Institute of Information and Navigation, Air Force Engineering University, Xi’an 710077, China) ②(Institute of Science, Air Force Engineering University, Xi’an 710051, China)
Abstract：In order to extract the micro-motion signatures in condition of Migration Through Range Cells (MTRC) of micro-motional scatterers and azimuthal undersampling in wideband radar, a method based on the Orthogonal Matching Pursuit (OMP) decomposition of the complex image is proposed. By making use of the amplitude and phase information of “range-slow-time image”, a set of micro-Doppler signal atoms is constructed in the complex image space. The OMP algorithm in vector space is then extend to the complex image space to obtain the micro-motion parameters. Simulations demonstrate the proposed method can extract the micro-motion signatures when MTRC of micro-motional scatterers is occurred, and can also work well when the sampling rate is lower than the Nyquist sampling rate.
