An Application of Wide-Lane to Long Baseline GPS Measurements (2)

Hiroshi Isshiki

Abstract:	For ambiguity resolution, various methods are proposed and successfully applied when baseline distance is small. In the present paper, observation equations by a dual frequency receiver are used (Melbourne (1985), Wtibbena (1985) and Goad (1988)). From theoretical viewpoint, if the errors due to satellites and receivers are cancelled by double difference, the double differences of the two initial phase ambiguities in L~ and L 2 , ionosphere delay and sum of true range and troposphere delay may be determined precisely without being influenced by the baseline length. The term in the wide-lane Lw proportional to pseudo ranges is proportional to the difference of the frequencies of L~ (1.58GHz) and L 2 (1.23GHz). This nature is very important, since the errors due to the pseudo ranges becomes small. This makes the rapid and correct convergence possible in the estimation of the initial phase ambiguity in Lw. Unfortunately, the estimation of the ionosphere delay by the present method is not correct. This is because of some kind of biases in the pseudo ranges that can't be canceled by the double difference operations. Hence, the initial phase ambiguities in L~ and L 2 can't be estimated correctly in the convergence calculations similar to that used to obtain the initial phase ambiguity in L w .
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	2713 - 2722
Cite this article:	Isshiki, Hiroshi, "An Application of Wide-Lane to Long Baseline GPS Measurements (2)," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2713-2722.
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