改良式模稜函數法應用於GNSS相對定位研究; Applying Modified Ambiguity Function Approach to GNSS Relative Positioning

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Title:	改良式模稜函數法應用於GNSS相對定位研究;Applying Modified Ambiguity Function Approach to GNSS Relative Positioning
Authors:	陳冠宏;KUAN-HUNG CHEN
Contributors:	土木工程研究所
Keywords:	台灣電離層模型;改良式模稜函數法;全球衛星導航系統;MAFA;TWIM;GNSS
Date:	2011-07-23
Issue Date:	2012-01-05 11:08:48 (UTC+8)
Abstract:	以載波相位觀測量進行定位計算時，整數相位模稜與坐標參數的高相關特性，往往是不可避免的問題。一般解決途徑有兩種，整數解關聯法與模稜函數法，理論上估計與消去整數相位模稜會有相同的結果。 GLONASS衛星系統現已穩定運行，且提供全世界免費服務，目前已是最有潛力與GPS進行整合的新興導航衛星系統。其FDMA訊號特性，使得求解方式有別於CDMA系統，以致兩系統間整合更是深具挑戰。本論文即在探討以改良式模稜函數法，在保有相位模稜的整數特性狀態下，直接對坐標分量進行解算。本實驗以GLONASS與GPS衛星系統為對象，以基線長度、衛星構形與電離層模型TWIM的改正成效等進行討論。實驗結果可以發現在台灣地區目前GPS定位成果較GLONASS為好。配合TWIM模型改正，此方法在55公里基線，GPS系統可達平面定位精度約7公分，高程方向約14公分。GLONASS系統平面定位精度約12公分，高程方向約23公分。 For positioning purpose, using carrier-phase observations has to deal with the highly correlated parameters between ambiguity and geometry. Generally, there are two ways to solve the problem, integer-valued decorrelating algorithm and ambiguity function method. Theoretically, estimating and eliminating ambiguity are equivalent. GLONASS have been operated stably and provided free service worldwide. Currently, it is the most potential satellite system to integrate with GPS. Otherwise, the FDMA signal structure, which is different from CDMA, makes integrations full of challenge. The proposed method generates the solution of geometry in the condition of preserving integer-valued ambiguity. The experiments used GLONASS and GPS observations to compare with different baseline lengths, satellite configurations and TWIM corrections in positioning results. The results show that GPS is more available than GLONASS in Taiwan region. With TWIM corrections, the GPS positioning differences is 7 cm in horizontal and 14 cm in vertical component. GLONASS positioning differences is 12 cm in horizontal and 23 cm in vertical component.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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