Author: Fu, Yu
Title: Implementation of a real-time GPS cycle slips detection and correction algorithm with single dual-frequency receiver
Degree: M.Sc.
Year: 2014
Subject: Global Positioning System
Global Positioning System -- Mathematical models
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Construction and Environment
Pages: viii, 94 leaves : ill. (some col.) ; 30 cm.
Language: English
Abstract: During the past twenty years, the application of GPS surveying techniques greatly benefited the development of the surveying engineering, especially for the high accuracy applications like real time kinematic (RTK) and precise point positioning (PPP) which implement carrier phase observations as the main measurements for positioning can easily achieve a precision of centimeter to millimeter level. However, the precision of carrier phase observation will be degraded by the occurrence of cycle slips in the event of loss of lock and each cycle of slip can easily bring in a range error of ~20cm to the L1 measurements. Liu (2010) developed a new real time automated cycle slip detection and repair method based on ionospheric total electron contents rate (TECR) and Melbourne-Wubbena wide lane (MWWL) linear combination to uniquely determine the cycle slip on both L1 and L2 frequencies. In this dissertation, several tests showed that his method may have some problems in the event of high noise level of wide lane ambiguities and rapid ionospheric variation. To solve these problems and develop a more robust and effective method for cycle slips detection and correction, a modified method is proposed by combining his method and a second-order differencing carrier phase. The proposed approach has been tested by six different datasets collected under different levels of ionospheric activities with both simulated cycle slips and real cycle slips. The results show that this method is very effective in cycle slips detection and correction even under high ionospheric activities.
Rights: All rights reserved
Access: restricted access

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