Citation

Liu F, Liu Y, Nie Z, Gao Y. J. Navig. 2021; 74(1): 24-37.

Copyright

(Copyright © 2021, Royal Institute of Navigation of Great Britain, Publisher Cambridge University Press)

DOI

10.1017/S0373463320000375

PMID

unavailable

Abstract

Precise positioning with low-cost single-frequency global navigation satellite system (GNSS) receivers has great potential in a wide range of applications because of its low price and improved accuracy. However, challenges remain in achieving reliable and accurate solutions using low-cost receivers. For instance, the successful ambiguity fixing rate could be low for real-time kinematic (RTK) while large errors may occur in precise point positioning (PPP) in some scenarios (e.g., trees along the road). To solve the problems, this paper proposes a method with the aid of additional lane-level digital map information to improve the accuracy and reliability of RTK and PPP solutions. In the method, a digital camera will be applied for lane recognition and the positioning solution from a low-cost receiver will be projected to the digital map lane link. With the projected point position as a constraint, the RTK ambiguity fixing rate and PPP performance can be enhanced. A field kinematic test was conducted to verify the improvement of the RTK and PPP solutions with the aid of map matching. The results show that the RTK ambiguity fixing rate can be increased and the PPP positioning error can be reduced by map matching.

Language: en

Keywords

Low Cost; Map Matching; Precise Point Positioning; Real-Time Kinematic; Single Frequency