文章基本信息

标题：New method to resolve 2π ambiguity in NBV
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作者：Wu Jiang ; Nobuyuki Kawano ; Fuyuhiko Kikuchi 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2012
卷号：64
期号：1
页码：37-41
DOI：10.5047/eps.2011.08.008
出版社：Springer Verlag
摘要：The Narrow Bandwidth VLBI (NBV) technique is utilized to track spacecrafts in Japanese lunar exploration.However, the problem of 2 π ambiguity affects the phase delay of the carrier waves transmitted by satellites.A probabilistic algorithm called coarse search and fine delay search, in combination with a simple ambiguity judgment procedure, is presented in the current paper to resolve the 2 π ambiguity.This method is employed to estimate both the delay and the delay rate from the residual phases obtained using NBV.Compared with previous analytic methods, it does not require strict constraint conditions.The ambiguity can be resolved even when the phase variations in the residual phase are 0.2 rad (approximately 11.6 degrees) compared with the less than 4.3 degree phase variations in the analytic method.The method also has the advantage of giving short time variations in the orbital motion of a satellite without ambiguity using NBV. Key words VLBI 2 π /cycle ambiguity coarse search fine delay search delay and delay rate NBV.
关键词：VLBI ;2π/cycle ambiguity ;coarse search ;fine delay search ;delay and delay rate ;NBV