ANALYSIS OF AVAILABILITY OF DOP TO FORECAST GNSS RELATIVE POSITIONING
Cao Xinyun1) ; Wang Jian1) ; and Liu Chao2)
1)Key Laboratory for Land Environment and Disaster Monitoring of SBSM, CUMT, Xuzhou 221116;2)School of Geodesy and Geomatics, Anhui University of Science and Technology, Huainan 232001
Abstract On the basis of principles of GNSS pseudorange single point positioning and relative positioning,the formulas of absolute positioning factor of precision DOP and relative positioning factor of precision RDOP were deduced. This paper also analyzes the relation between two factor of positioning and their variation law and give the applicability scope for using DOP to forecast the GNSS relative positioning. The result indicates that DOP and RDOP have similar variation trend, but not agreed in some part. With the increasing of the number of the observed noncommonview satellites and the asymmetry of geometric strength of satellite， the deviation of using DOP to forecast relative positioning would increase correspondingly. In this case, we had better choose PDOP to conduct relative positioning prediction.
