摘要
动目标的二次相位误差是方位向速度和距离向加速度作用的结果,导致信号的调频率改变。本文提出了一种抑制SAR图像中静止杂波背景检测慢速动目标的方法,它搜索动目标二次相位误差,汇聚动目标能量,同时利用包含正负对称二次相位误差的静止背景复图像模处处相等的规律,对消静止杂波背景,从而提高了检测动目标的性能。实测数据表明本算法有效。
A new and powerful method for detecting moving targets in a synthetic aperture radar（SAR） image is presented. Phase errors induced by many moving targets are largely quadratic, which provides a basis, by way of a change in the Doppler rate, for estimating the combined effects of azimuth constant velocity and radial acceleration. In this paper, the data in the SAR image is corrected by subtracting the quadratic phase error, and inverse changed by adding the same quadratic phase for comparing, both results are transformed to time domain, where the fixed background clutter have same image intensity. The absolute value of subtracting the two signal expected to have superior moving target detection performance. The experiment result prove this method is valid.
出处
《电子与信息学报》
EI
CSCD
北大核心
2005年第8期1229-1232,共4页
Journal of Electronics & Information Technology
关键词
合成孔径雷达
移动目标检测
二次相位误差
Synthetic aperture radar, Moving target detection, Quadratic phase error
