Initial Research on Comparison of PPP-Inferred GPS- and BDS-PWV in China Region
Due to the special constellation design with GEO, IGSO and MEO, the BeiDou System (BDS) now is available to provide a good coverage over the China region. This makes it possible to study the precipitable water vapor (PWV) inversion with only BeiDou observ
- PDF / 591,092 Bytes
- 9 Pages / 439.37 x 666.142 pts Page_size
- 107 Downloads / 188 Views
Initial Research on Comparison of PPP-Inferred GPS- and BDS-PWV in China Region Wenwen Li, Min Li, Lizhong Qu, Xing Su and Qile Zhao
Abstract Due to the special constellation design with GEO, IGSO and MEO, the BeiDou System (BDS) now is available to provide a good coverage over the China region. This makes it possible to study the precipitable water vapor (PWV) inversion with only BeiDou observations using the precise point positioning (PPP) method. This paper selected 5 stations among the BETS (BeiDou Experiment Tracking Stations) network with GPS/BDS dual-mode dual-frequency data for the research. By the PPP approach, the zenith tropospheric delay (ZTD) was estimated at each station using only BDS or GPS observations respectively. And then the PWV was obtained by a conversion factor and the zenith wet delay retrieved from the estimated ZTD. The results show that due to the bias of 1–10 mm existing between the BDSand GPS-derived ZTD, the inferred BDS-PWV and GPS-PWV is biased about 0.1–2 mm. And the final mean bias and STD of BDS- and GPS-PWV difference of all 5 stations is 0.78 and 1.73 mm. It is concluded that the PWV inferred from BDS can reach similar precision comparing to the GPS-PWV in the China region. Keywords BeiDou system delay PANDA
Precipitable water vapor
GPS
Tropospheric
18.1 Introduction The precipitable water vapor (PWV) is the key parameter of the weather analysis and numerical weather prediction. Bevis [1] first proposed the method that retrieves the PWV from zenith tropospheric delay (ZTD) estimations using the precise W. Li (&) School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China e-mail: [email protected] W. Li M. Li L. Qu X. Su Q. Zhao Research Center of GNSS, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, Lecture Notes in Electrical Engineering 305, DOI: 10.1007/978-3-642-54740-9_18, Springer-Verlag Berlin Heidelberg 2014
199
200
W. Li et al.
positioning approach with ground-based GPS observations. And after that, a series of GPS meteorology experiments like GPS/STORM, WWAVE successfully proved that the feasibility of using GPS as a precise approach to obtain the PWV (GPSPWV), as well as the ground-based GPS-PWV can reach as high precision as the radiosonde and water vapor radiometer [2, 3]. Now the precision of GPS-PWV can reach 1–2 mm, and it has already been widely used in the meteorology studies. As one of the GNSS systems, the BeiDou system (BDS) now has 14 satellites (5GEO + 5IGSO + 4MEO) in service, and it was officially announced to provide operational positioning service over the Asia–Pacific region on Dec 27th 2012. Due to the special constellation design, BDS is available to provide a good coverage over the China region. This makes it possible to study the precipitable water vapor (PWV) inversion with only BeiDou observations using the precise point positioning (PPP) method. The key point of the PWV inversion using ground-bas
Data Loading...
