Single epoch ambiguity resolution for Galileo with the CAR and LAMBDA methods |
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Authors: | Shengyue Ji Wu Chen Chunmei Zhao Xiaoli Ding Yongqi Chen |
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Institution: | (1) Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China;(2) Chinese Academy of Surveying and Mapping, Beijing, China |
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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. |
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Keywords: | Ambiguity resolution Galileo CAR method LAMBDA method Success rate |
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