Assessment of BDS/Galileo Precise Point Positioning with Ambiguity Resolution

doi:10.11871/jfdc.issn.2096-742X.2022.04.011

Abstract

Abstract:

[Objective] This study is aiming at non-integer features of ambiguity in traditional precise point positioning (PPP), accomplishing ambiguity-resolution based on integer clock products, verifying the influence of PPP ambiguity fixation on positioning performance of GAL-only and the improvement in orientation performance and ambiguity fixation rate under BDS/GAL combined mode. [Methods] Experimental verification is carried out based on real data. The positioning accuracy of PPP under the fixed ambiguity and improvement in ambiguity fixation rate are calculated under GAL-only and BDS/Galileo combined mode. [Results] Under GAL-only ambiguity fixed mode, the E direction of five stations improved significantly. after the addition of the BDS system, the improvement rate of positioning accuracy of five stations in direction E is more than 70%, and the effect of the other two directions is not as obvious as in direction E. [Conclusions] Ambiguity-resolution is one of the major factors to improve the precision and fast convergence of PPP. Correct ambiguity-resolution can improve positioning performance. Compared with GAL-only, the addition of the BDS system can enhance the positioning performance and ambiguity-resolution rate.

Key words: precise point positioning, ambiguity-resolution, uncalibrated phase delay, integer clock product

ZHANG Jingkui,ZHOU Peng,CHEN Yongchang,SHENG Chuanzhen. Assessment of BDS/Galileo Precise Point Positioning with Ambiguity Resolution[J]. Frontiers of Data and Computing, 2022, 4(4): 114-122, https://cstr.cn/32002.14.jfdc.CN10-1649/TP.2022.04.011.

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站标识	X	Y	Z
BUCU	4093760.5690	2007794.0980	4445130.1367
POTS	3800689.3658	882077.65395	5028791.4797
ULAB	-1257409.0530	4099404.3122	4707992.5435
URUM	193030.1095	4606851.2868	4393311.5809
WUH2	-2267750.1791	5009154.4913	3221294.3690

分类	误差项	处理方式
数据处理参数设置	观测值模型	无电离层组合
数据处理参数设置	卫星截止高度角	10°
误差处理方式	相对论效应	模型改正
	卫星钟差和轨道	GBM精密产品
	接收机钟差	高斯白噪声
	天线相位中心	文件改正
	码偏差	BSX文件
	地球自转	ERP天解文件
	模糊度设置	PPP_AR模式和浮点解模式

RMS值站名	单Galileo浮点解（RMS/cm）			单Galileo固定解（RMS/cm）			Galileo/BDS2/BDS3固定解（RMS/cm）
RMS值站名	E	N	U	E	N	U	E	N	U
BUCU	10.6	5.5	9.2	0.83	0.57	1.5	0.42	0.21	1.17
POTS	6.7	4.2	6.6	0.7	0.6	0.93	0.25	0.56	0.48
ULAB	4.7	4.2	11.8	1.24	1.64	1.68	0.45	1.53	1.39
URUM	11.9	7.4	5.9	2.91	6.17	2.56	1.59	5.98	2.64
WUH2	12.3	7.2	1.5	1.12	1.17	1.45	0.59	1.01	0.54