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British Journal of Applied Science & Technology, ISSN: 2231-0843,Vol.: 4, Issue.: 29 (11-20 October)

Review Article

GPS Cycle Slip Detection and Correction at Measurement Level

 

Malek Karaim1*, Tashfeen B. Karamat1, Aboelmagd Noureldin2 and Ahmed El-Shafie3
1Electrical and Computer Engineering Department, Queens University, 19 Union Street, Kingston Ontario, K7L 3N6, Canada.
2Department of Electrical and Computer Engineering, Royal Military College of Canada, PO Box 17000, Station Forces Kingston, Ontario Canada K7K 7B4, Canada.
3Department of Civil and Structural Engineering, University Kebangsaan Malaysia, 43600 Bangi Selangor, Malaysia.

Article Information

Editor(s):

(1) Rodolfo Dufo Lopez, Department of Electrical Engineering, University of Zaragoza, Spain.

Reviewers:

(1) Anonymous.

(2) Anonymous.

(3) Anonymous.

(4) Anonymous.

(5) Anonymous.

Complete Peer review History: http://www.sciencedomain.org/review-history/5699

Abstracts

Carrier phase measurements are much more precise than pseudorange measurements and can be used to achieve very accurate positioning solutions. However, carrier phase measurements require resolution of integer ambiguities before precise positioning can be achieved. The GPS receiver can keep track of the integer number of cycles as long as the receiver maintains lock to the satellite signal. However, in reality, the GPS signal could be interrupted momentary by some disturbing factors leading to a discontinuity of an integer number of cycles in the measured carrier phase. This interruption in the counting of cycles in the carrier phase measurements is known as a cycle slip. When a cycle slip occurs, the Doppler counter would restart causing a jump in the instantaneous accumulated phase by an integer number of cycles. Thus, the integer counter is reinitialized meaning that ambiguities are unknown again. In this event, either the ambiguities need to be resolved again or cycle slips need to be corrected to resume the precise positioning/navigation process. These cycle slips can, to some extent, be detected and fixed to avoid delay and computation complexity attributed to integer ambiguity resolution. Researchers have been addressing the problem of cycle slip detection and correction for the last two decades. This paper provides a detailed survey for available techniques to tackle the problem showing their pros and cons.

Keywords :

Cycle slips; Carrier phase;GPS; Integer Ambiguities.

Full Article - PDF    Page 4239-4251

DOI : 9734/BJAST/2014/11850

Review History    Comments

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