摘要
简要介绍GPS精密单点定位的基本原理,通过对带双频动态GPS数据的1∶2 500~1∶60 000各种摄影比例尺的覆盖多种地形航摄资料的处理,比较了GPS精密单点定位与差分GPS定位所获取摄站坐标的差异,并分析利用两种摄站坐标分别进行GPS辅助光束法区域网平差的精度。试验表明,当区域四角布设四个平高地面控制点时,两者的加密精度是基本一致的,且采用GPS精密单点定位技术进行GPS辅助空中三角测量结果能够满足我国现行航空摄影测量规范的精度要求。
This paper describes briefly the basic principle of GPS Precise Point Positioning （PPP） and analyzes the accuracy of 3D coordinates of the exposure station positions obtained by PPP. A great deal of actual aerial photographs, at image scales from 1：2 500 to 1：60 000, with PPP data taken from multi-type topography in China were processed by our GPS-supported bundle block adjustment program WuCAPS. The empirical results have verified that the errors are very distinct in the 3D coordinates of the exposure station positions determined by PPP. However, when there are 4 XYZ ground control points around the corners of a block area, the accuracy of GPS-supported bundle block adjustment with GPS data by PPP method is closed to that by DGPS method. And the accuracy satisfies the topographic maps specifications for aerophotogrammetric office operation.
出处
《测绘学报》
EI
CSCD
北大核心
2007年第3期251-255,共5页
Acta Geodaetica et Cartographica Sinica
基金
教育部新世纪优秀人才支持计划项目(NCET-04-0662)
教育部长江学者和创新团队发展计划-创新团队项目(IRT0438)
