摘要
文中将动目标的运动分为距离和方位向运动。搜索SAR图像中动目标的二次相位误差可检测到动目标,根据二次相位误差校正量可测算动目标方位向速度;将动目标聚焦后的图像在频域分为两部分后分别成像,若两图像亮度接近,则频域分界点的频率近似为动目标信号的多普勒质心,据此可测算出目标距离向速度。实测数据表明该算法有效。
A new and powerful method for detecting movin g targets velocity in a synthetic aperture radar(SAR) image is presented. Phase er rors induced by many moving targets are largely quadratic, which provides a basi s, by way of a change in the Doppler rate, for estimating the azimuth constant v elocity. In this paper, the Doppler rate is searched by fast dispersed quadrati c phase transform(FDQPT). Target range velocity induced Doppler center frequency shift. The Doppler center is gotten by separate in the moving target image into two images in fourier-domain and comparing them in time-domain. From the Dopple r center the moving target range velocity is computed. The experiment data prove this method is valid.
出处
《现代雷达》
CSCD
北大核心
2005年第3期43-46,共4页
Modern Radar
关键词
合成孔径雷达
二次相位误差
多普勒中心
调频率
synthetic aperture radar
quadratic phase err or
the Doppler center
the Doppler rate
