优化MapDrift算法估计SAR多普勒频率

MapDrift Algorithm Optimization on Doppler Frequency Estimation

在采用MapDrift算法估计多普勒调频率时,如何选择距离单元内的方位向信号作估计将直接影响其估计的精度,传统的能量最大准则方法不能保证所选距离单元内存在单一强散射点,估计精度受限,文中采用先Dechirp脉压再做选择的方法,并且判断前半部分和后半部分信号是否包含相同的强散射点,对满足条件的方位向信号进行多普勒调频率估计,实际数据补偿效果表明了该方法的有效性。

When MapDrift algorithm is used to estimate Doppler frequency,how to select the signals of range bin to estimate Doppler frequency is important for estimation precision.The traditional method is based on the selecting of the large power signals,but this method can′t ensure the signal existing strong scatters.In this paper we use dechirp pulse compress to select the azimuth signals which exists strong scatters and judge whether the forward and afterward signal contains the same strong scatters.The effective ...