Research on Ground Moving Target Indication for Spaceborne MIMO-SAR of Multiple Carrier-frequencies
Qi Wei-kong①② Yu Wei-dong①
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(Graduate University of Chinese Academy of Sciences, Beijing 100039, China)
Abstract:Ground moving target indication for multiple carrier-frequencies spaceborne MIMO-SAR system is explored in this paper. According to the characteristics of multiple carrier-frequencies spaceborne MIMO-SAR, Space Frequency Adaptive Processing (SFAP) algorithm based on eigenspace projection is employed for suppressing clutter, and then the Double-Threshold Constant False Alarm Rate (DT-CFAR) is proposed for detecting moving targets. DT-CFAR, firstly, uses TM-CFAR to detect moving targets after the clutter corresponding to different carrier-frequencies is suppressed by SFAP, and then the detected result is through accumulating multiple pulses detector to improve detection probability and decrease false probability. Simulation results prove, farther, the validity and great performance of multiple carrier-frequencies spaceborne MIMO-SAR system for ground moving target indication.