A hybrid optical–wireless network for decimetre-level terrestrial positioning

Abstract

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Improved GNSS integer ambiguity resolution method based on the column oriented Cholesky decomposition

“…Yingxiang Jiao 1 , Kezhao Li 1,2* , Chendong Tian 1 , Guoku Zhu 1 , Zhe Yue 1 , Keke Xu 1 Because the traditional Cholesky decomposition algorithm still has some problems such as computational complexity and scattered structure among matrices when solving the GNSS ambiguity, in order to further improve the computational efficiency of the least squares ambiguity reduction correlation process in the carrier phase integer ambiguity solution. In this paper, the decomposition process of traditional matrix elements is divided into two steps: multiplication update and column reduction of square root calculation and column division calculation.…”

“…Global navigation satellite system (GNSS) is an air-based radio navigation and positioning system, which can provide users with all-weather three-dimensional coordinates and time information at any place on the earth's surface or near earth space 1 . Where, the key to whether GNSS can achieve high-precision differential positioning is the rapid solution of carrier phase integerc ambiguity 2~5 .…”

“…+ + y Aa Bb e (1) In Equations (1), y is the carrier phase double difference observation value, a is the double difference ambiguity vector, b is the unknown of baseline vector after double difference, A and B are designed matrices of ambiguity and baseline respectively, e is the error vector。 To solve equation ( 1), it can be transformed into a constrained least-squares problem according to the leastsquares criterion. The formula is as follows 2 , min ,…”

Autonomous Intersection Management: Optimal Trajectories and Efficient Scheduling

“…In addition to GPS-RTK (Global Positioning System-Real-Time Kinematic) [ 120 ], SLAM (Simultaneous Localization And Mapping) [ 121 ], and inertial units [ 122 ], the authors propose ground position markers [ 17 ] or cameras that observe the scene to help CAVs [ 118 ]. Currently, new technologies of positioning allow foreseeing position accuracy unattainable in the past [ 123 ]. However, this does not totally solve the problems related to velocity control and the associated errors.…”

An Intelligent Compaction Analyser: A versatile platform for real-time recording, monitoring and analysing of road material compaction

“…Geo-location system of ICA produces highly accurate GPS positions using ZED-F9R module 44 . This module is capable of generating 0.2 m Horizontal Position Accuracy (HPA) data with a navigation rate of up to 30 Hz when the real-time kinematic (RTK) 45,46,47 is available. NTRIP (Networked Transport of RTCM via Internet Protocol) data required for RTK is provided to the ZED-F9R module using the onboard Wi-Fi of SBC, as shown in Fig.…”