星载合成孔径雷达的目标定位方法

论述星载合成孔径雷达（ＳＡＲ）中，利用卫星星历表和雷达回波数据的距离－多普勒参数对目标定位的方法，并用解析法推导出目标相对于星下点位置的计算公式，以及目标的地球经纬度坐标公式。此方法的优点是不需要在星载ＳＡＲ的视场中使用任何位置确知的参考点，并且与卫星的姿态数据无关。还介绍了目标距离－多普勒参数的决定方法，并讨论了目标定位误差源，以及定位精度的评估。

THE LOCATION METHOD FOR TARGETS IN SATELLITE BORNE SAR

A method has been explained to determine the location of a target's pixel in a di gital SAR image. This technique utilizes the satellite ephemeris data and the range Doppler frequency information of the SAR echo data to produce on estimate of the latitude and longitude of an arbitrary pixel. This approach has an advantage that requires no reference points and is independent of satellite attitude knowledge or control. The method has been also described to determine the slop range and Doppler frequence for a target in satellite borne SAR. Location error sources are analyzed and test results conducted using Seasat SAR imagery are also introduced.