Comparative Studies of Three Decorrelating Algorithmsin AmbiguityResolution for Phase-onlyand Code-guided Cases

摘要

In precise GPS positioning using carrier phase measurement,rninteger ambiguity resolution is essential. Generally,rnambiguities are resolved via two steps, namely, float solutionrnand search procedure. In this paper, three transformationrntechniques, i.e. Z-transformation used in thernLAMBDA (Least squares AMBiguity Decorrelation Adjustment)rnmethod, the technique applied by LLL (Lenstra,rnLenstra and Lov′asz) algorithm and the whitening filter approach,rnthat decorrelate the covariance matrix of the floatrnsolution in the search procedure are compared from mathematicalrnand computational point of view. Some comparativernexperiments using 2-dimensional computer simulation andrnreal receiver data are made.