基于强点信息的SAR多普勒中心估计算法

提出了一种利用强散射点回波信息的合成孔径雷达多普勒中心快速估计算法,算法直接对距离压缩之后的回波信号进行处理,利用图像处理中的相关技术进行强散射点的选择和时域徙动曲线的跟踪,在提取出强点目标的距离时域徙动曲线后,由距离走动和多普勒中心之间的关系,直接计算得到多普勒中心估计值。算法的计算步骤简单,在对含有强散射点的回波数据进行处理时可以获得很高的计算效率。对Radarsat I卫星原始数据的处理,验证了算法的有效性。

SAR Doppler centroid estimator using primary point information

A fast algorithm for synthetic aperture radar (SAR) Doppler centroid estimation is proposed. The echo information of primary point is utilized and echo signal after range compression is processed. Some techniques of image processing domain are used to select primary points and to tail the range migration curves. After range migration curve is picked up, the Doppler centroid can be directly calculated based on the relations between Doppler centroid and rang walk values. The step of this algorithm is simple and high computation efficiency can be achieved for the echo signal containing primary point target.Through processing Radarsat I raw data, validity of the proposed algorithm is verified.