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Vol.37, No.3
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Systems Engineering — Theory & Practice Mar., 2017
doi: 10.12011/1000-6788(2017)03-0768-05
: P228.1
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Fast resolution of double frequency BDS integer ambiguity
realized by improved LAMBDA algorithm
WANG Jianmin, MA Tianming, ZHU Huizhong
(School of Geomatics, Liaoning Technical University, Fuxin 123000, china)
Abstract Using the BeiDou Navigation Satellite System (BDS) for baseline settlement, the key problem
is the correct solution of ambiguity. Using carrier phase observations of BDS to make up wide lane
double difference observations, the best effect algorithm of LAMBDA is used to calculate wide lane double
difference integer ambiguity. However, the algorithm has the disadvantage of large deviation of ambiguity
float solution and large search range. So, the paper put forward to use Tikhonov to improve LAMBDA
algorithm, singular value decomposition of the coefficient matrix of the unknown parameters in the wide
lane double difference observation equation, replacing the covariance matrix of the LAMBDA algorithm
with the decomposition of the covariance matrix and searching for the ambiguity of wide lane double
difference, the precision of the float solution of the wide lane double difference integer ambiguity and the
accuracy of ambiguity are improved. Deviation average values of ambiguity float solution of improved
LAMBDA algorithm were reduced from 1.0829 cycles to 0.0059 cycles, variance values were reduced from
4.0534 cycles to 0.0479 cycles, the accuracy of the degree is raised from 93.52% to 100%.
Keywords BeiDou Navigation Satellite System; double frequency; ambiguity; LAMBDA algorithm
1
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FARA
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: 2015-09-22
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wjminln tu@163.com.
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(41474020, 41504010)
Foundation item: National Natural Science Foundation of China (41474020, 41504010)
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2017, 37(3): 768–772.
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: Wang J M, Ma T M, Zhu H Z. Fast resolution of double frequency BDS integer ambiguity realized by improved
LAMBDA algorithm[J]. Systems Engineering — Theory & Practice, 2017, 37(3): 768–772.
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