Mixed Application of Single and Dual Frequency Receivers in Single-Frequency Precise Point Positioning

Abstract:

Precise point positioning （PPP） is not affected by the local observation and infrastructure which is beneficial for deformation monitoring. Considering the influence of the ionospheric delay on single-frequency point positioning， the method of the mixed application of the single and dual frequency observations is proposed. However， the single-frequency precise point positioning is affected by the fractional bias of phase observation. The method for introducing the dual-differenced ambiguity into single-frequency precise point positioning is discussed. The data are processed using the method proposed. The results show that the estimated ionospheric delay is higher than 1 cm which can meet the requirement of single-frequency point positioning. It is noticed that the convergence time can be shortened for an average improvement of 7 minutes. The improvements for the single-frequency point positioning in the directions of the North， East， and UP can reach 0.23， 0.14， and 0.21 cm， respectively.