GPS rapid precise positioning based on wavelet transform
Zhenqi Hu · Meitan xuebao · 2007
Based on principle of wavelet transform,GPS double-differenced carrier observables were decomposed in different wavelet function and different scaling function,and the high-frequency noise was removed.Then the denoised double-differenced observables were used to estimate unknown parameters to reduce the effect of measurement noise on the solution of ill-conditioned equations in GPS rapid positioning.Through the analysis of the basic characters of different wavelet base,four common wavelet bases such as Haar,dbN,CoifN and symN were selected in the data processing of GPS rapid precise positioning.Results show that the wavelet transform can greatly improve the precision of estimated ambiguity and baseline float solution in GPS rapid positioning.