基于自校验直接线性变换的星载SAR图像定位方法研究

Study of Satellite SAR Imagery Location Based on Self-calibration Direct Linear Transformation

应用摄影测量理论,将星载SAR图像近似看作一个多中心投影传感器获取的等效影像,基于星载SAR共线方程给出了SAR图像的自校验直接线性变换定位模型.选用一景北京地区RadarSat影像进行实验.结果表明,自校验直接线性变换模型表达简单,求解稳定,不需要任何轨道信息和成像参量且校正准确度保持在像素级范围之内,因而该模型适用于星载SAR图像的准确定位.

The satellite SAR imagery was regarded as an image which was acquired from the multi-center projection sensor approximately based on photogrametry theory. The satellite SAR collinearity equation was revised and the self-calibration direct linear transformation model for satellite SAR was proposed. As an example, the RadarSat Imagery was tested. Experiment result demonstrates that the new model formulation is simple and the resolution is stable without any orbit ephemeris and imaging parameters, and location accuracy can also reach pixels. So self-calibration direct linear transformation model of satellite SAR can be applied in practice.