Open AccessA modified estimation method of GLONASS inter-frequency bias for RTK based on short baseline
Author(s) -
Yucheng Lu,
Zhibin Xiao,
Shaojie Ni
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1738/1/012032
Subject(s) - ambiguity resolution , glonass , ambiguity , range (aeronautics) , computer science , frequency deviation , baseline (sea) , algorithm , phase (matter) , standard deviation , global positioning system , mathematics , statistics , gnss applications , telecommunications , engineering , automatic frequency control , physics , oceanography , quantum mechanics , geology , programming language , aerospace engineering
Different from other satellite systems, GLONASS adopts frequency-division multiple access (FCMA) technology to distinguish satellites, which directly leads to frequency deviation during signal receiving. Additionally, carrier phase inter-frequency bias (IFB) between different types of receivers are usually not zero, hindering the ambiguity resolution and thus limits the positioning accuracy. To solve this problem, a new estimating method of GLONASS ambiguity is proposed in this paper. According to the variation range of frequency deviation rate, the influence of phase IFB on ambiguity was removed by using searching method and quadratic linear model, thus reducing phase IFB estimating problem to an optimizing one. Feasibility of the method was verified using zero baseline data. Results show that the method can guarantee the reliability of RTK solution effectively.