空间相机摆扫成像立体定位精度仿真分析  

Simulation and analysis of stereo geolocation accuracy of space camera by whisk broom imaging

作　　者：夏中秋[1,2] 黄巧林 何红艳[1,2] 杨媛丽 孙世君[1,2] 岳春宇 

机构地区：[1]北京空间机电研究所,北京100094 [2]中国空间技术研究院,北京100094

出　　处：《中国空间科学技术》2017年第3期117-125,共9页Chinese Space Science and Technology

摘　　要：为了验证空间相机摆扫成像立体定位的可行性,考虑成像比例尺变化、摆扫角测量精度、摆扫角稳定度和摆扫角速度等影响因素,建立了以总体设计中影响定位精度的各指标为参数的空间相机摆扫成像几何模型,推导了基于误差传播理论的定位精度计算方法,并对平面定位精度和高程精度进行了仿真,提出了摆扫成像方式条件下提高定位精度的有效措施。结果表明,在成像幅宽较大时,单线阵摆扫成像线阵长度较小情况下和双线阵推扫成像线阵长度较大情况下,可达到相近的定位精度,提高摆扫角测量精度、摆扫角稳定度及时间同步精度,可提高平面定位精度。摆扫成像立体定位精度仿真方法适用于大幅宽成像遥感卫星定位精度指标分配。To verify the feasibility of the geolocation of space camera by the whisk broomImaging, the geometric model of space camera by whisk broom Imaging was built concerningthe change of the Image scale, the whisk angle measurement accuracy, the whisk anglestability and the whisk angular velocity, taking the factors of geolocation accuracy in the overall design as the parameters. The geolocation accuracy algorithm based on the errorpropagation theory was derived, the simulation was carried out and the Improving method was put forward. The results show that the geolocation accuracy of the large width rmageryis similar between thesmaller linear length by the whisk broom imaging and the longer linear length by the push broom imaging. Improving the whisk angle measurement accuracy, thewhisk angle stability and the time synchronization accuracy can improve the plane geolocation accuracy. The simulation method of the geolocation accuracy of space camera by whisk broom imaging is applicable to the index assignment of the large width imagery of the remote sensing satellite.

关 键 词：摆扫成像 平面定位精度 高程精度 仿真分析 空间相机 

分 类 号：P228.1[天文地球—大地测量学与测量工程]