Study on the Impact of Temporal Variability of Receiver Code and Phase Biases on PPP

doi:10.11871/jfdc.issn.2096-742X.2022.04.004

Abstract

Abstract:

[Objective] The receiver bias including receiver code bias and receiver phase bias is a prominent source of error in satellite positioning. It is generally taken as a constant in traditional algorithms. However, bias is time-varying in practical applications. Therefore, it is of great significance to analyze the influence of the time-varying bias. [Methods] Combined with the traditional PPP model, the MPPP model that takes the time variability of the bias into account, and the PPP model with the inter-satellite difference, the stations with significant deviation have been comparatively tested, and the estimation result of posterior residuals of pseudo-range, positioning error and ambiguity have been compared respectively. [Conclusions] The results show that receiver code bias fluctuates substantially, while receiver phase bias fluctuates smoothly. Therefore, the receiver code bias is the main factor affecting parameter estimation. The estimation results of ambiguity that absorb the receiver code bias are significantly affected, while those that does not absorb the receiver code bias are not significantly affected by the time-varying bias.

Key words: receiver code bias, receiver phase bias, precise point positioning, parameter estimation

CHE Delu,LIU Teng,ZHANG Baocheng. Study on the Impact of Temporal Variability of Receiver Code and Phase Biases on PPP[J]. Frontiers of Data and Computing, 2022, 4(4): 34-44, https://cstr.cn/32002.14.jfdc.CN10-1649/TP.2022.04.004.

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站名	天线类型	观测时段
BALA	LEIAR25.R3 NONE	DOY:2020.183
MTDN	TRM59800.00 SCIS	DOY:2020.183
LONA	LEIAR25.R3 LEIT	DOY:2020.183

项目	处理策略
函数模型	UPPP、MPPP、SDPPP
观测值	UPPP、MPPP使用原始码和相位观测值,SDPPP使用原始码和相位观测值的星间单差值
系统类型	GPS
滤波模型	最小二乘滤波
数据采样率	30s
截止高度角	7°
天线改正	igs14.atx参数改正
相位缠绕	改正
电离层斜延迟	白噪声
天顶对流层延迟	UNB3估计干延迟,湿延迟当作随机游走估计
接收机钟差	MPPP、UPPP中当作白噪声估计,SDPPP中被单差消除
接收机码偏差	MPPP中当作白噪声估计,UPPP中作为常数被其他参数吸收,SDPPP中被单差消除
接收机相位偏差	MPPP、UPPP中当作常数被模糊度参数吸收,SDPPP中被单差消除
测站坐标	白噪声
相位模糊度	浮点常数
轨道钟差	MEGX精密产品(GFZ)
卫星DCB改正	利用CODE和MEGX产品改正品内偏差