一种适用于WindSat的地理定位方法

星载全极化微波辐射计WindSat为海面风场的被动微波遥感提供了有效的手段。WindSat亮温需要经过地理定位才能形成包含目标位置信息的有效物理量。地理定位是辐射计数据预处理的重要环节。针对WindSat圆锥扫描方式,将Patt94定位算法进行修改,应用于WindSat地理定位中。详述了定位的计算过程,给出了定位结果,讨论了误差分析方法。通过模拟WindSat轨道,对可能的定位误差来源展开分析,着重分析了辐射计姿态误差、扫描方位误差对定位的影响。最后,就辐射计姿态校正进行了讨论。

A Geolocation Algorithm for WindSat

Spaceborne polarimetric microwave radiometer WindSat can provide the effective measurement for the ocean surface wind vector.The brightness temperatures measured by WindSat need geolocation process.Geolocation is an important part of WindSat data calibration and validation.In this paper,a modified geolocation algorithm of Patt94 is used for WindSat.The evaluation process is presented and the errors are analyzed.By simulating WindSat orbit,possible error sources and their influences are described.Finally,a method for radiometer attitude correction is discussed.