伪卫星增强GPS精密定位新方法  

New technique for precision positioning using pseudolite augmented GPS

作　　者：何秀凤[1] 桑文刚[1] 杨光[1] 

机构地区：[1]河海大学卫星及空间信息应用研究所,南京210098

出　　处：《东南大学学报（自然科学版）》2005年第3期460-464,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50279005);辽宁工程技术大学地理空间信息技术与应用实验室开放基金资助项目.

摘　　要：介绍了基于伪卫星技术的变形监测新概念,探讨了目前伪卫星定位存在的远近效应、多路径效应等关键技术问题,研究了伪卫星增强GPS的组合定位新方法.从分析精度因子着手,重点研究了伪卫星观测量加入对精度因子的影响,并以小东江坝山谷地域为试验区,计算了4种GPS与伪卫星组合方案中精度因子的变化情况.研究结果表明,采用伪卫星增强GPS定位显著降低了高程精度因子,从而大大提高了垂直方向的定位精度,使得GPS卫星在水平和垂直方向的定位精度相当.A new conception for deformation monitoring using pseudolites is described. Some key issues in pseudolite positioning applications, such as near-far problem and multipath effects are presented, and the methodology for integration of global positioning system (GPS) and pseudolites measurements is developed. From the viewpoint of dilution of precision (DOP), the effects on improving position accuracies adding pseudolite observations are analyzed. Four integration cases for Xiaodongjiang dam located in a valley were investigated. DOP analysis results of pseudolite augmented GPS for deformation monitoring of the Xiaodongjiang dam were also given. It can be seen that VDOP (vertical DOP) value decreases dramatically using pseudolite augmented GPS. Thus, GPS vertical positioning accuracy is improved to correspond to its horizontal accuracy.

关 键 词：全球定位系统 伪卫星 变形监测 精密定位 工程测量 

分 类 号：TU45[建筑科学—岩土工程]