Realization of High-Precision Relative Positioning Using Beidou Regional Navigation Satellite System

Abstract

Based on Beidou regional navigation satellite system in the phase of 4GEO + 5IGSO constellation, systematic research on Beidou high-precision relative positioning has been carried out by sufficient measured data from Beidou test network. A comparison scheme with Beidou/GPS dual-mode data is designed, and feasibility and attainable precision of Beidou relative positioning have been verified effectively. As shown in results: coordinate accuracy realized by Beidou relative positioning has achieved centimeter level, and baseline repeatability has reached millimeter level, which are equivalent to GPS high-precision relative positioning level. For short baseline, coordinate repeatability in the North, East and Up direction is respectively better than 0.5, 1.3 and 2.9 mm, and absolute error of coordinate is respectively better than 0.2, 0.6 and 1.7 mm by comparison with GPS; for medium/long baseline, the coordinate repeatability in the NEU direction is respectively better than 2.1, 5.9 and 7.3 mm, and absolute error of coordinate is respectively better than 1.6, 1.3 and 2.2 mm; for long baseline over 1000 m, NEU coordinate repeatability is respectively better than 8.4, 14.6 and 21.3 mm, and absolute error is respectively better than 1.5, 1.5 and 14.5 mm, and baseline repeatability is approximately 0.003 ppm. The conclusion from the article provides technical criteria for widespread use of Beidou in the high precision application fields, and makes sense for promotion of application prospect and enhancement of usage confidence with Beidou.