低信噪比条件下调频率估计的子空间投影方法  

Doppler Rate Estimation Method Based on Sub-space Projection Technique in Case of Low

作　　者：马仑[1] 廖桂生[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安71007

出　　处：《系统仿真学报》2007年第12期2790-2792,2797,共4页Journal of System Simulation

基　　金：国家自然科学基金(60472097)

摘　　要：当SAR回波数据的信噪比较低时,准确估计多普勒调频率变得十分困难。提出了一种基于子空间投影技术的多普勒调频率估计方法。该方法利用不同距离单元的观测矢量构造协方差矩阵,然后通过对协方差矩阵特征分解得到噪声子空间,最后将相位误差矢量向噪声子空间投影来估计多普勒调频率。在信噪比较低的条件下此方法可以稳健地估计多普勒调频率。It is difficult to estimate Doppler rate accurately when the Signal-to-noise ratio （SNR） of SAR echo is low. A Doppler rate estimation method based on sub-space projection technique was proposed. This method constructs covariance matrix by utilizing data vectors in different range lines and projects phase error vector into noise sub-space which is formed by eigendecomposing the covariance matrix. The proposed method may estimate Doppler rate robustly in the case of low SNR.

关 键 词：合成孔径雷达 多普勒调频斜率 子空间投影 信噪比 

分 类 号：TN911.72[电子电信—通信与信息系统]