Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34103
Title: Single epoch ambiguity resolution for Galileo with the CAR and LAMBDA methods
Authors: Ji, Shengyue
Chen, Wu
Zhao, Chunmei
Ding, Xiaoli 
Chen, Yongqi
Keywords: Ambiguity resolution
CAR method
Galileo
LAMBDA method
Success rate
Issue Date: 2007
Publisher: Springer
Source: GPS Solutions, 2007, v. 11, no. 4, p. 259-268 How to cite?
Journal: GPS solutions 
Abstract: This paper investigates single epoch ambiguity resolution performance using Galileo four frequency data. Two commonly used ambiguity resolution methods are used in the tests, including the Cascade Ambiguity Resolution (CAR) and the Least-Squares Ambiguity Decorrelation Adjustment (LAMBDA) methods. For CAR method, four optimal combinations are carefully selected according to their wavelength to noise ratios and success rate for ambiguity fixing. The test results show, in general, the LAMBDA method performs better than the CAR method. The speed of ambiguity resolution is closely related to the carrier phase measurement precision. With carrier phase measurement precision of 3 mm, single epoch ambiguity resolution can be achieved at every epoch with simulated 1-s interval 24-h Galileo data (total epochs 86,400). With the increase of carrier phase noise, ambiguity resolution performances become worse. When the noise level is increased to 12 mm, single epoch ambiguity resolution can only be achieved about 50% of epochs.
URI: http://hdl.handle.net/10397/34103
ISSN: 1080-5370
EISSN: 1521-1886
DOI: 10.1007/s10291-007-0057-9
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