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根据资源三号卫星传感器的成像原理,构建严格几何模型进行直接定位。通过对不同时间的资源三号全色影像进行实验,验证了姿态角常差的存在,并建立校正模型对其进行改正。利用少量控制点改正姿态角常差后,影像立体定位精度可显著提高。不同地区的实验结果表明,姿态角常差不是恒定不变的,需要根据长期观测建立其变化模型。
According to the imaging principle of Resource No.3 satellite sensor, a rigorous geometric model is constructed for direct location. Experiments on panchromatic images of resource No.3 at different times have been carried out to verify the existence of the attitude angle anomaly and to establish a correction model to correct it. After a small amount of control points are used to correct the attitude angle discrepancy, the stereoscopic positioning accuracy of the image can be significantly improved. The experimental results in different regions show that the attitude angle constant is not constant and needs to be established based on long-term observation.