Extraction of Slant Wet Delay and Three Dimensional Wet Refractivity Tomography by GPS

Yunchang, Cao, Y. Q. Chen and P. W. Li

Abstract:	We examined the accuracy of slant wet delays (SWD) derived from the double differenced (DD) of GPS carrier observations against the measurements with Water vapor radiometer (WVR) and ORSM (an operating numeric weather model in the Hong Kong observatory). The GPS method determines slant wet delays with 3 mm bias and 29.5 mm RMS against the WVR, 1.3 mm bias and 48.3 mm RMS against the ORSM, whose accuracy is primarily dominated by that of the zenith wet delay and magnified by the wet mapping function. Using SWD observations, we retrieved the three dimensional wet refractivity by Kalman filtering method and then compared with radiosonde measurements. Both coincide well except on the surface and middle levels with differences of about 4 mm/km in low levels.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	261 - 268
Cite this article:	Yunchang,, Cao,, Chen, Y. Q., Li, P. W., "Extraction of Slant Wet Delay and Three Dimensional Wet Refractivity Tomography by GPS," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 261-268.
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