Multifrequency algorithms for precise point positioning: MAP3

摘要: We present the new MAP3 algorithms to perform static precise point positioning (PPP) from multifrequency and multisystem GNSS observations. represents a two-step strategy in which least squares theory is applied twice estimate smoothed pseudo-distances, initial phase ambiguities, slant ionospheric delay first, absolute receiver position its clock offset second adjustment. Unlike classic PPP technique, our approach, ionospheric-free linear combination not used. The of signals different satellite systems accomplished by taking into account inter-system bias. has been implemented MATLAB integrated within complete software developed on site named PCube. test performance numerically contrast it with other external programs. In general, accuracy low-noise GPS dual-frequency observations about 2.5 cm 2-h observation periods, 1 10 h, 7 mm after day. This means an improvement short periods at respect convergence time also analyzed some results obtained real triple-frequency GIOVE are presented.