不同高度截止角下BDS/GPS定位分析  

BDS/GPS Positioning Analysis in Various of Cut-off Elevations

作　　者：田翌君 赵冬青[1] 黄志勇[1] 吴昊[1] 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《测绘科学技术学报》2015年第4期361-367,共7页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(41274045);中国航天科技集团公司卫星应用研究院创新基金项目(2014_CXJJ_DH_14)

摘　　要：研究了BDS/GPS联合RTK定位的理论和算法,主要包含了BDS/GPS组合系统在不同高度截止角下的可视卫星数与PDOP值的比较;BDS与GPS观测量精度的初步评估;双频联合RTK定位的模糊度解算和定位性能的分析等。得出如下结论:BDS/GPS组合系统的可视卫星数相对单系统明显增多,PDOP值减小,在大高度截止角下,其空间几何强度依然很高;随着高度截止角的增大,BDS与GPS受多路径影响明显减弱,其中GEO卫星受多路径影响最大;BDS观测量精度与GPS相当。BDS/GPS双频联合定位的定位精度相对于GPS或BDS虽没有明显提高,但在大高度截止角下,依然可以成功固定模糊度并实现高精度定位。这将显著改善GPS或BDS单系统双频RTK定位在受遮挡环境下的可用性和可靠性。In this contribution, the theory and algorithms of the combined BDS and GPS positioning were mainly re- searched. The number of visible satellites and PDOP values of BDS/GPS integrated system in various of cut-off ele- vations were analyzed by a lot of real datasets, and then the measurement accuracy of BDS and GPS was assessed by the double difference residuals; finally the performance of BDS/GPS multi-frequency RTK positioning over short baseline was evaluated. The following conclusions could be drawn： the more satellites of BDS and GPS were visible in the combined BDS and GPS positioning, which would significantly reduce the PDOP value, and even in high cut-off elevations, the spatial geometry intensity still remained high; with the cut-off elevation increased, the im- pact of multipath effects on BDS and GPS was significantly weakened, and GEO suffered the largest influence of muhipath effects among BDS and GPS satellite; measurement accuracy of BDS was comparable to that of dual-fre- quency GPS; the AR could still be successfully fixed and high positioning accuracy could still be achieved in case of high cut-off elevations although the positioning accuracy of BDS/GPS was not significantly improved, which would improve the availability and reliability of the current RTK positioning under some challenging conditions.

关 键 词：BDS/GPS组合 RTK定位 观测量精度 可用性 可靠性 

分 类 号：P228[天文地球—大地测量学与测量工程]