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Carrier Phase Based Navigation Algorithm Design Using Carrier Phase Statistics in the Weak Signal EnvironmentCarrier Phase Based Navigation Algorithm Design Using Carrier Phase Statistics in the Weak Signal Environment

Other Titles
Carrier Phase Based Navigation Algorithm Design Using Carrier Phase Statistics in the Weak Signal Environment
Authors
박슬기조득재박찬식
Issue Date
2012
Publisher
사단법인 항법시스템학회
Keywords
carrier phase based positioning; carrier phase statistics; weak signal environment
Citation
Journal of Positioning, Navigation, and Timing, v.1, no.1, pp 7 - 14
Pages
8
Journal Title
Journal of Positioning, Navigation, and Timing
Volume
1
Number
1
Start Page
7
End Page
14
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/1035
DOI
10.11003/JKGS.2012.1.1.007
ISSN
2288-8187
2289-0866
Abstract
Due to inaccurate safe navigation estimates, maritime accidents have been occurring consistently. In order to solve this, the precise positioning technology using carrier phase information is used, but due to high buildings near inland waterways or inclination, satellite signals might become weak or blocked for some time. Under this weak signal environment for some time, the GPS raw measurements become less accurate so that it is difficult to search and maintain the integer ambiguity of carrier phase. In this paper, a method to generate code and carrier phase measurements under this environment and maintain resilient navigation is proposed. In the weak signal environment, the position of the receiver is estimated using an inertial sensor, and with this information, the distance between the satellite and the receiver is calculated to generate code measurements using IGS product and model. And, the carrier phase measurements are generated based on the statistics for generating fractional phase. In order to verify the performance of the proposed method, the proposed method was compared for a fixed blocked time. It was confirmed that in case of a weak or blocked satellite signals for 1 to 5 minutes, the proposed method showed more improved results than the inertial navigation only, maintaining stable positioning accuracy within 1 m.
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