多载频星载MIMO-SAR系统动目标检测技术研究

该文研究多载频星载MIMO-SAR系统动目标检测技术.针对多载频星载MIMO-SAR的特点,使用子空间投影的空频自适应处理抑制杂波,并提出一种双门限恒虚警检测器.双门限恒虚警检测器主要思想是各载频对应的回波信号通过SFAP杂波抑制后,使用剔除平均恒虚警检测动目标,得到各载频对应的检测结果,最后将检测结果使用二进制多次脉冲积累进行二次检测,进一步提高检测概率.仿真结果表明,空频自适应处理能有效抑制杂波;同时双门限恒虚警检测器将有助于进一步提高多载频星载MIMO-SAR系统动目标检测性能.

Research on Ground Moving Target Indication for Spaceborne MIMO-SAR of Multiple Carrier-frequencies

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.