Vectorized integrity monitoring method for PPP-RTK correction products

doi:10.11947/j.AGCS.2024.20230475

Abstract

Abstract:

PPP-RTK correction products serve as fundamental information for achieving the satellite navigation-based positioning with high-precision and rapidly convergence simultaneously. Integrity monitoring is a core requirement for ensuring the reliability of PPP-RTK positioning. The traditional integrity monitoring methods for PPP-RTK correction products suffer from the lack of the monitoring risks allocation tree and the low sensitivity in monitoring multiple faults. These shortcomings cause a decreased availability of the PPP-RTK correction products. In this contribution, a vectorized integrity monitoring method is proposed for PPP-RTK correction products. Based on the minimum protection level criteria, the integrity and continuity risk of PPP-RTK correction products has been allocated. A sequential pre- and post-broadcasting loopback monitoring architecture has been developed in the range domain and the position domain, respectively. The proposed method, implemented with carrier phase observations, incorporates vectorized classification and monitoring, along with the executive monitoring the results of multiple stations. The proposed vectorized integrity monitoring method enhances the sensitivity and availability of the integrity monitoring for PPP-RTK correction products. Analysis of simulation and real-world data indicates that the proposed method outperforms traditional methods in both sensitivity and availability, achieving at least 99% of availability.

Key words: PPP-RTK, correction products, integrity monitoring, vectorization, availability

CLC Number:

P228

Liang LI, Liuqi WANG, Ningbo WANG, Min LI, Zishen LI, Fengze DU, Shuai PANG, Zhibo NA. Vectorized integrity monitoring method for PPP-RTK correction products[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(9): 1777-1789.

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修正产品类型\完好性指标	完好性风险	连续性风险
卫星钟轨修正产品	8.74×10^－9	8.36×10^－7
区域对流层修正产品	6.81×10^－9	6.23×10^－7
区域电离层修正产品	3.45×10^－8	3.54×10^－6

监测站名称	不可用	误警	连续性/(%)	可用性/(%)
TUO2	103 686	3	99.99	99.48
CUTA	52 901	0	100	99.75
INVR	141 943	0	100	99.34
IGEO	43 243	0	100	99.78
KARL	103 709	0	100	99.35
HKFN	52 594	10	99.99	99.75

异常幅值	超限	正确告警	误警	可用性/(%)
0倍标准差	0	0	328	99.99
1倍标准差	5	5	2210	99.91
2倍标准差	212	212	38 485	98.44
3倍标准差	4509	4509	338 821	86.34

修正产品类型	平均MDB/m		可用性/(%)
修正产品类型	传统方法	本文方法	传统方法	本文方法
卫星钟轨修正产品	0.432	0.146	95.85	99.42
区域对流层修正产品	0.850	0.357	95.10	99.47
区域电离层修正产品	1.237	0.374	94.32	99.46