单双频GPS混合观测高精度单频精密单点定位

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

摘要:

精密单点定位不受局域观测和设施影响，有利于形变监测。为降低电离层延迟对单频精密单点定位结果的影响，提出了单双频混合观测的方法。但单频精密单点定位仍受相位非小数偏差影响，为此提出采用双差模糊度应用于单频精密单点定位。观测数据解算结果表明，电离层延迟精度优于1 cm，满足单频精密单点高精度定位的要求，对应的单频精密单点定位可实现厘米级结果。双差模糊度应用于单频精密单点定位时，参数收敛时间平均缩短约7 min，在北、东、高程3个方向的定位结果平均分别提升0.23、0.14、0.21 cm。

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.