面向大众导航应用的精密单点定位完好性监测方法

doi:10.7527/S1000-6893.2022.27904

Abstract

Abstract:

High precision and high reliability positioning for general-purpose mass navigation applications has become a research hotspot. Integrity monitoring of Precise Point Positioning (PPP) can provide tightly integrity guaranteed absolute position error bounds for safety-critical applications. However, due to the observation quality of low-cost receivers and the effects of local occlusion in the general-purpose navigation application environment, hazard misleading information will challenge the reliability of PPP and reduce the availability of integrity monitoring. In this paper, a solution separation-based integrity monitoring algorithm is proposed based on a single and dual frequency undifferenced and uncombined PPP model. By establishing a threat model for general-purpose navigation application scenarios to suppress dangerous misleading information. Meanwhile, observation data are used to improve satellite geometric distribution, so as to improve the availability of integrity monitoring. Finally, the static experiment based on low-cost ublox receiver and dynamic experiment under local occlusion environments are designed. The results show that the proposed algorithm can produce adequate protection level, which can form the tightly guaranteed position error bounds. Moreover, the proposed algorithm can effectively suppress misleading information in the dynamic local occlusion environment, and has higher availability.

Key words: precise point positioning, integrity, general-purpose navigation application, threat model, ublox receiver

CLC Number:

V249.3

Jie ZHANG, Lin ZHAO, Fuxin YANG, Zhiguo SUN, Liang LI. PPP integrity monitoring algorithm for general-purpose navigation applications[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(13): 327904-327904.

Figures/Tables 13

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类别	SF PPP	DF PPP	SDF PPP
观测量数量	2n	4m	4m+2（n-m）
估计参数数量	2n+5	3m+5	3m+2（n-m）+5
自由度	-5	m-5	m-5
所需最小卫星数	秩亏	≥5颗双频卫星	≥5颗双频卫星

配置参数	数值
数据类型	GPS（L1/L2） BDS（B1/B2）
时间长度/h	约5
采样间隔/Hz	1
完好性风险/（10^-4 h^-1）	1
连续性风险/（10^-3 h^-1）	1
先验故障概率/10^-4	3.3

配置参数	数值
数据类型	GPS（L1/L2） BDS（B1/B2）
采样间隔/Hz	1
完好性风险/（10^-4 h^-1）	1
连续性风险/（10^-3 h^-1）	1
先验故障概率/10^-4	3.3

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PPP integrity monitoring algorithm for general-purpose navigation applications

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