Use of GPS Pseudo-Range and Phase Data for Measurement of Ionospheric and Tropospheric Refraction

A.J. Coster, E. M. Gaposchkin

Abstract:	One of the goals at Lincoln Laboratory is to estimate accurately the combined tropospheric and ionospheric path delay up to geosynchronous altitude. By accurately we mean to better than 1 m at UHF, or 10 em at L-band. To accomplish this, we have been investigating the use of GPS integrated phase and pseudo-range measurements. We have developed a technique which allows us to determine both the ionospheric and tropospheric path delay from this data. We have compared our results to those obtained using incoherent scatter measurements of the ionosphere and refractometer measurements input to a tropospheric model. Using only the phase data we recover zenith values of refraction for the troposphere and the ionosphere. This procedure uses mapping functions which depend on the International Reference Ionosphere (IRI) and the Davis troposphere model. Recently, we have combined the GPS pseudo-range measurements with the phase measurements in our data processing. To do this we developed a method to estimate the receiver and satellite (Ll-L2) biases. The use of the group delay data with the phase information will be discussed.
Published in:	Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989) September 27 - 29, 1989 The Broadmoor Hotel Colorado Spring, CO
Pages:	439 - 443
Cite this article:	Coster, A.J., Gaposchkin, E. M., "Use of GPS Pseudo-Range and Phase Data for Measurement of Ionospheric and Tropospheric Refraction," Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989), Colorado Spring, CO, September 1989, pp. 439-443.
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