利用PPP分析GPS天线积雪引起的信号传播延迟  

Propagation Delay Induced by Antenna Snow Cover Using PPP Technology

作　　者：吴继忠[1] 

机构地区：[1]南京工业大学测绘学院,南京市中山北路200号210009

出　　处：《武汉大学学报（信息科学版）》2012年第5期617-620,共4页Geomatics and Information Science of Wuhan University

基　　金：武汉大学地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(10-01-12);江西省数字国土重点实验室开放基金资助项目(DLLJ201105)

摘　　要：分析了GPS天线积雪对载波信号场强、功率的影响,推导了载波信号传播延迟的简化计算公式,利用精密单点定位(PPP)计算了测站在GPS天线积雪产生和消除前后的单日解。结果显示,天线积雪使得天线相位中心产生偏移,对平面和高程方向的影响为数个cm,甚至更大。The purpose of this investigation is to illustrate the effects of receiver antenna snow accumulation on GPS phase observables.Firstly,the effects of snow cover on carrier phase signal field strength and power are analyzed.Then a simplified model is developed to estimate GPS phase propagation delay due to the complicated mixing ratio of snow and resultant complex refractivity.The theoretical analysis revealed that the magnitude of propagation delay,which can be significant in high-accuracy GPS applications,depends on satellite elevation,the water content of snow and snow depth.At last,the daily coordinates of two stations with ten continuous days of GPS observations are estimated using precise point positioning technology.The results indicate that antenna snow cover have an effect on the antenna phase center,and induce horizontal and vertical errors of several centimeters or even more.

关 键 词：接收机天线 积雪 传播延迟 精密单点定位 测站环境误差 

分 类 号：P228.41[天文地球—大地测量学与测量工程]