Open AccessGNSS pseudorange and time‐differenced carrier phase measurements least‐squares fusion algorithm and steady performance theoretical analysis
Author(s) -
Qian Nijia,
Chang Guobin,
Gao Jingxiang
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.2408
Subject(s) - pseudorange , gnss applications , algorithm , global positioning system , computer science , filter (signal processing) , least squares function approximation , mathematics , statistics , telecommunications , computer vision , estimator
In Global Navigation Satellite System (GNSS) community, pseudorange observables, without integer ambiguity, have large measurement noise, while carrier phase observables, with high measurement accuracy, have integer ambiguity, which restricts the direct use either of them for high‐accuracy navigation and positioning. In this regard, fusing pseudorange and ambiguity‐free time‐differenced carrier phase (TDCP) is a popular data processing technique. In this Letter, the least‐squares fusion is studied. A theoretical analysis of the steady performance of this fusion is conducted. A set of formulas of the steady performance is derived, based on which simulations are carried out for different pseudorange‐carrier‐phase precision ratios. Results showed that the steady accuracy of fusion pseudorange is about two orders of magnitude higher than that of the original pseudorange, and is close to that of carrier phase observables. Besides, the convergence speed and the comparison to the Hatch filter are also checked in the simulations.