星载合成孔径雷达目标定位研究

系统和深入地研究了星载合成孔径雷达（SAR）对地面目标的定位问题，详细阐述了利用卫星历表和雷达回波数据的距-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坐标公式，并且明确地给出了目标位置的计算程序。在此基础上还完成了关于地面目标定位误差的较完整的分析，导出了一套相应的计算公式，解决了文献中的一些遗留问题。

Studies of Ground Target Location of Spaceborne SAR

In this paper, the ground target location of spaceborne synthetic aperture radar (SAR) was deeply discussed. This technique utilizes the spacecraft ephemeris data and the range Doppler frequency information of the SAR echo data to produce an estimate of the ground target position. The general formulas of the latitude and longitude of the ground target position were derived. And the calculation program of the ground target position was also given. On this basis, the location errors of the ground target were analyzed completely, and the corresponding calculation formula was also derived. This approach has an advantage that requires no reference points and is independent of spacecraft attitude knowledge or control. The some problems left over and ambignity in current papers have been resolved.