【作者】 于明成； 许稼； 彭应宁；

【Author】 Yu Mingcheng,Xu Jia and Peng Yingning Electronic Engineering Department of Tsinghua University

【机构】 清华大学电子工程系；

【摘要】 基于SAR与场景之间的几何关系,得出了快速解SAR多普勒中心模糊的新方法。首先估计不同距离单元上的模糊的多普勒中心,然后进行线性拟合得到多普勒中心随斜距变化的斜率,据此斜率,就可以反演出绝对的多普勒中心,从而实现快速解模糊。分析了估计精度。该方法计算效率高,适用于低对比度场景,实测数据验证了其有效性。更多还原

【Abstract】 Based on SAR geometry,a new fast approach to resolve PRF-ambiguity for SAR is presented in this paper.First of all, the estimation of the ambiguous Doppler centroid at each range cell are performed,and then the slope at which the ambiguous Doppler centroid varies with slant range is computed.By the slope,the absolute Doppler centroid and the PRF_ambiguity number can be inferred.The achievable accuracy is derived theoretically.The proposed method is computationally efficient,and works best with low contrast scene.Experiments with Radarsat and ERS-1 data verify its validity.更多还原