介绍了“天绘一号”卫星的总体方案、技术特点、研制历程和应用概况, 重点介绍了“天绘一号”卫星的技术特点和应用前景, 以便用户了解、熟悉“天绘一号”卫星, 更好使用其各种影像产品, 更好发挥卫星的应用效能。“天绘一号”卫星摄影定位与测图系统采用LMCCD(Line Matrix Charge Coupled Device)测绘体制, 由前视、正视和后视3台全色CCD相机, 3台星敏感器以及1台GPS接收机组成;其中正视相机焦平面上还设计有4个小面阵CCD器件, 用于提高摄影定位的高程精度。卫星摄影测量基高比为1。卫星通过一个高强度、高刚度和高稳定度的测绘光学平台, 将3台测绘相机、3台星敏感器和1台多光谱相机集成为一体, 满足了测绘任务对星敏感器与相机间几何角度关系的高精度及高稳定度要求。在轨测试结果表明, 卫星摄影定位精度优于任务指标要求, 可满足无地面控制点条件下测制全球1:50000比例尺地图要求。
Mapping Satellite-1, designed and developed with the heritage of small satellite CAST 2000 by DFH Satellite Co.LTD, is the fi rst new-generation transmission type photogrammetric satellite of China. Its photogrammetric positioning and mapping system uses LMCCD(Line Matrix Charge Coupled Device)surveying and mapping structure, consisting of three independent panchromatic mapping CCD cameras for forward, nadir and backward looking, three star sensors and one GPS receivers. On the focal plane of the nadir-looking camera, beside one linear array CCD, there are four area array CCDs to improve elevation accuracy. The nominal B/H ratio for stereo is 1.0. By a optical bench of high strength,high rigidity, high stability, the three mapping cameras, three star sensors and a multispectral CCD camera are integrated together as an organic whole, satisfying well high precision and high stability missions requirements of the geometrical angle relations between the cameras. In-fl ight test results show that the photogrammetric positioning accuracy is better than mission requirements, and Mapping Satellite-1 satisfi es global mapping requirements of 1:50000 scale without ground control points. The General design, technical features, course of development and in-fl ight images of Mapping Satellite-1 are mainly presented in this article, especially the technical characteristics and the application perspective are emphatically described in order for different users to utilize all kinds of products of the satellite better, improving its application effi ciency.