A constrained LAMBDA method for GPS attitude determination |
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| Authors: | Bo Wang Lingjuan Miao Shunting Wang Jun Shen |
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| Institution: | (1) Department of Automatic Control, School of Information Science and Technology, Beijing Institute of Technology, Beijing, 100081, China |
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| Abstract: | An improved method to obtain fixed integer ambiguity in GPS attitude determination is presented. Known conditions are utilized
as constraints to acquire attitude information when the float solution and its variance–covariance matrix are not accurate
enough. The searching ellipsoidal region is first expanded to compensate for errors caused by the inaccurate float solution.
Then the constraints are used to shrink the region to a proper size, which maintains the true integer ambiguity. Experimental
results demonstrate that this scheme gives a fast search time and a higher success rate in determining the fixed integer ambiguity
than the unconstrained method. The accuracy of attitude angles is also improved.
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| Keywords: | GPS Integer ambiguity LAMBDA method Constraint conditions Attitude determination |
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