高分七号卫星于2019年11月在太原顺利发射，是我国首颗亚米级高分辨率立体测绘卫星。星上采用国内首套星图融合星敏传感器，双星敏夹角动态修正，可大幅度提高卫星姿态确定精度，同时给卫星地面系统建设带来了新的机遇和挑战。本文根据高分七号卫星的总体设计，分析高分七号双线阵相机几何处理的关键技术，并对高分七号卫星前视后视精度以及立体精度进行几何验证。结果表明，高分七号双线阵相机的前后视几何检校精度达到0.28个像素，相机的无控定位精度可以控制在6米左右，在引入少量地面控制点进行刚性平移后，平面几何残差在1.4米左右，高程残差在0.86米左右。总体而言，高分七号卫星双线阵相机几何精度有了明显的提高，为后续卫星几何处理具有重要意义。

The Gaofen-7 satellite was successfully launched in Taiyuan in November 2019. It is my country"s first sub-meter high-resolution stereo mapping satellites. Star sensor with fusing star and image is used on the satellite in china firstly, and the angle of double star sensor can be corrected dynamically, which can greatly improve the accuracy of satellite attitude determination, and at the same time bring new opportunities and challenges to the construction of satellite ground systems. Based on the overall design of the Gaofen-7 satellite, this article analyzes the key technology of the geometric processing of the Gaofen-7 dual-line array camera, and verifies the geometric accuracy of front-view and rear-view cameras and stereo products. The results shows that the geometric calibration accuracy of front-view and rear-view cameras is better than 0.28 pixels, and the uncontrolled positioning accuracy of the camera can be controlled at about 6 meters. With the introduction of a few ground control points for rigid translation, the plane geometric residual is about 1.4 meters, and the elevation residual is about 0.86 meters. In general, the geometric accuracy of the dual-line array camera of the Gaofen-7 satellite has been significantly improved compared to other satellites in the Gaofen series, which is of great significance for subsequent satellite geometric processing.