Multi-constellation combined train positioning method based on precise single-point positioning
A precise single-point positioning and multi-constellation technology, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve the problems of low positioning accuracy and small number of satellites, and achieve the effect of enhancing adaptability and stability
Active Publication Date: 2021-08-03
BEIJING JIAOTONG UNIV
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[0004] At present, the single-constellation positioning system in the prior art has the following disadvantages: the number of available satellites is small and the positioning accuracy is low in the environment of limited railway satellite signals
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[0075] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0076] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and / or groups thereof. It will be understoo...
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The invention provides a multi-constellation combined train positioning method based on precise single-point positioning. The method comprises the steps of acquiring a satellite original observation data file from a GNSS receiver on a train to obtain satellite observation values including the pseudo-range, the carrier phase and the pseudo-range rate; according to data interpolation calculation in a real-time ultra-fast precise ephemeris issued by the IGS, obtaining required satellite epoch data, wherein the epoch data comprises a satellite position and a clock error; carrying out ionospheric delay, tropospheric delay and relativistic effect error compensation on the satellite observation values, and carrying out earth rotation error correction and satellite antenna phase center correction on the satellite epoch data; and inputting the combined observation values after each epoch error compensation and the satellite epoch data into a train precision single-point positioning model under a multi-constellation condition, and solving the model through a Kalman filtering algorithm to obtain train position information. According to the invention, the train operation position is obtained through the precise single-point positioning method under the multi-constellation condition, and the method can be used for train track real-time and post-processing analysis.
Description
technical field [0001] The invention relates to the technical field of train positioning, in particular to a multi-constellation combined train positioning method based on precise single point positioning. Background technique [0002] Precise Point Positioning (PPP) uses the precise ephemeris and clock error provided free of charge by the International GNSS Services (IGS) to model the various errors encountered by the signal from the satellite to the receiver And correction, using the carrier phase observation value to realize the absolute positioning method of a single machine. Compared with differential positioning, PPP only needs a single dual-frequency GNSS receiver, and the global static accuracy can reach the millimeter to centimeter level, and the dynamic accuracy can reach the centimeter to decimeter level. [0003] In terms of railway applications, compared with traditional differential positioning, PPP can make the GNSS-based train positioning system no longer re...
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IPC IPC(8): G01S19/50G01S19/33
CPCG01S19/50G01S19/33
Inventor 姜维刘梦杨蔡伯根王剑上官伟刘江陆德彪柴琳果
Owner BEIJING JIAOTONG UNIV