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星载微波散射计是目前唯一能够同时测量海面风速和风向的传感器,在海洋科学研究中发挥着重要作用。散射计获取的地物后向散射只有经过地理定位才能得到包含地物位置信息的有效物理量。因此,散射计地理定位是数据预处理的重要组成部分,与遥感数据的质量密切相关。扇形波束旋转扫描散射计具备扇形固定波束散射计和笔形波束旋转扫描散射计的优势,目前还没有实现在轨运行。基于其工作方式的特殊性,详细分析了该散射计的扫描方式,给出了一种适用于该散射计的地理定位方法,得到了最终的定位结果。然后分析了影响定位结果的误差源,讨论了卫星姿态对于定位结果的影响情况,最终利用HY-2卫星产品评价了该地理定位算法的相对精度指标。
Spaceborne microwave scatterometer is the only sensor that can simultaneously measure the wind speed and direction of the sea surface and plays an important role in marine scientific research. Backscatter of feature data acquired by the scatterometer can obtain the effective physical content containing the position information of the feature only after being geolocated. Therefore, the geolocalization of scatterometer is an important part of data preprocessing, which is closely related to the quality of remote sensing data. Fan-beam rotating scanning scatterometers have the advantages of a fan-shaped fixed-beam scatterometer and a pencil-shaped beam-rotating scanning scatterometer, which have not yet been implemented on-orbit. Based on the particularity of its working mode, the scanning mode of this scatterometer is analyzed in detail. A geolocation method suitable for this scatterometer is given, and the final positioning result is obtained. Then, the error sources that affect the positioning result are analyzed. The influence of the satellite attitude on the positioning result is discussed. Finally, the relative accuracy index of the geo-location algorithm is evaluated by the HY-2 satellite product.