改进的机载SAR多普勒中心估计方法  

Improved Algorithm of Doppler Centroid Estimation for Air-borne Synthetic Aperture Radar

作　　者：王霖郁[1] 闫龙[1] 王玥坤[2] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学理学院,黑龙江哈尔滨150001

出　　处：《测绘学报》2010年第3期271-275,共5页Acta Geodaetica et Cartographica Sinica

基　　金：黑龙江省博士后资助基金(3236301219)

摘　　要：线性相位误差导致机载SAR成像后目标的位置发生偏离,从而改变多普勒中心频率。研究线性相位误差的特点,提出一种改进的杂波锁定估计方法。该方法通过对方位谱能量重心的精确估计来得到多普勒中心初始的迭代预置值。精度优于原有多普勒中心估计方法,点目标成像上效果明显。最后使用机载雷达真实数据检验该方法的有效性。Linear phase error leads to that the estimated target location offsets from its original location in airborne SAR imaging,and the Doppler centroid frequency will be changed.The characteristics of linear phase error are researched,and an improved algorithm of clutter lock estimation is proposed.The initial value of the Doppler centroid iteration can be obtained through accurately estimating the center of the azimuthal energy spectrum.The accuracy of the method of Doppler centroid estimation is better than the original algorithm,especially in the imaging of point target.Based on real airborne SAR data,the feasibility and validity of the algorithm are demonstrated in conclusion.

关 键 词：合成孔径雷达 多普勒中心 杂波锁定 线性相位 

分 类 号：P237[天文地球—摄影测量与遥感]