星载SAR传感器外场定标实验研究—以TerraSAR-X卫星为例

传感器的定标精度是衡量SAR卫星系统性能和数据质量的重要标志。以TerraSAR\|X卫星为例,系统设计了外场定标实验流程,围绕高精度获取参考目标外场实际几何坐标和散射截面积的目标,对角反射器的设计与制作、布设方案、状态参数计算和坐标精密测量等问题进行了研究。基于同步获取的SAR数据和外业数据,进行了TerraSAR\|X几何和辐射定标参数的精度验证。验证结果证明了实验总体设计和关键问题解决的有效性,对于其他星载SAR定标工作具有借鉴意义。
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Research on Space-borne SAR Field Calibration Experiment—A Case Study of TerraSAR-X Field Calibration

The sensor calibration accuracy is an important measurement of SAR satellite’s performance and data quality.Taking TerraSAR\|X for example,this paper studied the procedure and critical techniques of space\|borne SAR field calibration,including corner reflectors’ design and manufacture,corner reflectors’ arrangement in the field,corner reflectors’ status parameters calculation and the surveying scheme.Based on the field data and SAR image acquired synchronizedly,TerraSAR\|X’s geometric and radiometric calibration parameters were validated.The results demonstrated the effectiveness and accuracy of the field calibration procedure and critical techniques.