机载SAR实时多普勒中心估计原理及硬件实现  

Doppler centroid real-time estimation and its hardware implementation for air-borne SAR

作　　者：汪亮[1] 禹卫东[1] 

机构地区：[1]中国科学院电子学研究所

出　　处：《系统工程与电子技术》2006年第2期184-187,共4页Systems Engineering and Electronics

摘　　要：针对机载SAR多普勒中心实时估计问题,提出了基于相关函数算法的实现方案,分析了影响估计精度的因素。该算法通过计算回波信号的方位向自相关函数来得到多普勒中心值,避免了对回波信号功率谱的计算,显著降低了运算量。该方案对不同距离子条带的数据进行估计,获得了多普勒中心在测绘带内的变化情况。给出了基于TI TMS320C6415芯片的硬件实现方法,对实际探测数据的估计结果表明该方案满足了精确度和实时性要求。To implement Doppler centroid real-time estimation for synthetic aperture radar （SAR）, a scheme based on correlation algorithm is proposed, and the analysis on the factors that affect the estimation precision is given. The algorithm derives Doppler centroid by reckoning auto-correlation function of echo signal in azimuth bins, hence avoiding Fourier transform and reducing computation cost dramatically. The scheme gets exact Doppler centroid change in the whole swath by estimating in 4 different sub-swaths in range bins. The method to implement this scheme on TI TMS320C6415 chips is described in detail, and the estimation results of SAR detection data demonstrate that the scheme satisfies the precision and real-time requirements.

关 键 词：合成孔径雷达 多普勒成像 相关函数算法 

分 类 号：TN957[电子电信—信号与信息处理]