Particle filter-based estimation of inter-frequency phase bias for real-time GLONASS integer ambiguity resolution

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• 作者：Yumiao Tian ; Maorong Ge ; Frank Neitzel
• 关键词：GLONASS ; Integer ambiguity resolution ; Phase inter ; frequency bias ; Particle filter ; Real ; time applications
• 刊名：Journal of Geodesy
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：89
• 期：11
• 页码：1145-1158
• 全文大小：3,050 KB
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• 作者单位：Yumiao Tian (1)
  Maorong Ge (2)
  Frank Neitzel (1)
  
  1. Technische Universit盲t Berlin, 10623, Berlin, Germany
  2. German Research Centre for Geosciences, 14473, Potsdam, Germany
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Mathematical Applications in Geosciences
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1394

文摘

GLONASS could hardly reach the positioning performance of GPS, especially for fast and real-time precise positioning. One of the reasons is the phase inter-frequency bias (IFB) at the receiver end prevents its integer ambiguity resolution. A number of studies were carried out to achieve the integer ambiguity resolution for GLONASS. Based on some of the revealed IFB characteristics, for instance IFB is a linear function of the received carrier frequency and L1 and L2 have the same IFB in unit of length, most of recent methods recommend estimating the IFB rate together with ambiguities. However, since the two sets of parameters are highly correlated, as demonstrated in previous studies, observations over several hours up to 1 day are needed even with simultaneous GPS observations to obtain a reasonable solution. Obviously, these approaches cannot be applied for real-time positioning. Actually, it can be demonstrated that GLONASS ambiguity resolution should also be available even for a single epoch if the IFB rate is precisely known. In addition, the closer the IFB rate value is to its true value, the larger the fixing RATIO will be. Based on this fact, in this paper, a new approach is developed to estimate the IFB rate by means of particle filtering with the likelihood function derived from RATIO. This approach is evaluated with several sets of experimental data. For both static and kinematic cases, the results show that IFB rates could be estimated precisely just with GLONASS data of a few epochs depending on the baseline length. The time cost with a normal PC can be controlled around 1 s and can be further reduced. With the estimated IFB rate, integer ambiguity resolution is available immediately and as a consequence, the positioning accuracy is improved significantly to the level of GPS fixed solution. Thus the new approach enables real-time precise applications of GLONASS. Keywords GLONASS Integer ambiguity resolution Phase inter-frequency bias Particle filter Real-time applications