相位平滑伪距对GNSS定位精度的影响

Influence of phase smoothed pseudorange on GNSS positioning accuracy

为了提高精密单点定位和双差网解算结果的精度,提出利用相位平滑伪距来提高GNSS定位精度的方法:给出数据预处理的方法和流程,分析处理后的观测值来解算动态伪距单点定位和动态精密单点定位结果,然后分析解算国内5个IGS站精密单点定位结果和双差网解结果。结果表明:单历元的伪距单点定位的精度比通常情况下的伪距单点定位要高出一个数量级,而单历元的精密单点定位结果要比通常定位软件数据预处理后的精度高0.5～1.5cm;利用精密单点定位解算IGS站获得的定位结果内符合精度均在2mm以内,外符合精度均在1～3cm,而双差网解获得的定位结果内符合精度均在1.5mm以内,外符合精度均在毫米级。

In order to improve the accuracy of precise single point positioning and double difference network calculation, this paper proposed an improved method to enhance GNSS positioning accuracy with the phase smoothing pseudo range： the pre processing steps were given, the single point positioning of dynamic pseudo range and dynamic precise point positioning were obtained by analyzing the processed observation values, and the results of precise single point positioning and double difference network solutions of 5 IGS stations in China were calculated. Results showed that the single point positioning accura cy of single epoch pseudorange would be one order higher than that of usual pseudorange, while the precise single point positio ning accuracy of single epoch would be 0.5-1.5 cm higher than that of usual positioning software data preprocessing; the in ternal accuracy by precise point positioning solution algorithm for IGS station could be higher than 2 mm, the external accuracy could be 1-3 cm, meanwhile, the internal accuracy by double difference network solutions could be higher than 1.5 mm, and the external accuracy could be in millimeter level.