小面阵辅助下的天绘一号卫星三线阵影像平差定位方法

Block Adjustment and Positioning Method for Tianhui-1 Three-Line-Array Satellite Image Assisted by Small-Sized Frame Image

提出了一种小面阵辅助下的三线阵卫星影像区域网平差约束方法,该方法以天绘一号卫星三线阵影像严格成像模型为基础,将下视线阵影像的局部区域等效成面阵影像,根据等效面阵影像与小面阵影像上同名像点的坐标差异,增加区域网平差约束方程,实现小面阵影像辅助下的三线阵影像区域网平差处理,完成对等效框幅式平差方法的扩展。利用天绘一号卫星影像数据进行了实验和分析,结果表明,该方法能够以小面阵影像数据为辅助,实现三线阵影像的区域网平差处理和整体定位精度的提升。

Assisted by small-sized frame image,a block adjustment constraint method is proposed for three-line-array image.Based on rigorous imaging model of Mapping Tianhui-1 three-line-array image,the nadir line-array image is translated to equivalent frame photo.The coordinate differences of homogeneous points between equivalent frame photo and small-sized frame image are used to construct constraint equations to realize block adjustment processing and to extend traditional equivalent frame photo block adjustment method.Experiments are done on Tianhui-1 satellite image,and the experimental results prove that the method can utilize small-sized frame images to improve the positioning precision of three-line-array image block adjustment.