An Improved GNSS Relative Positioning Method Applying C-LAMBDA Algorithm
Since the a prior baseline information between the antennas of the rover lacked of sufficient use in rel-ative positioning,the improved GNSS relative positioning method basing on C-LAMBDA algorithm was explored in this contribution.Firstly,the GNSS compass model was resolved with C-LAMBDA algorithm.Then,the ambiguity and baseline vectors were incorporated into relative positioning observation functions as the a prior in-formation,thus the benefits of the a prior baseline information which could be used to improve the resolution in attitude determination was extended to relative positioning,and the functional and stochastic models of the im-proved GNSS relative positioning method basing on C-LAMBDA algorithm were given.Based on that,the rela-tionship between the ambiguity dilution of precision(ADOP)for the traditional single-antenna-rover relative po-sitioning model and the proposed improved relative positioning model was deduced,with which the benefits of the proposed model on the precision of the float ambiguity solutions was revealed.Finally,the proposed method was validated with both simulated and real data sets.It is shown that,when compared with the traditional sin-gle-antenna-rover situation,the proposed method ensured more precise float ambiguity solutions in different con-ditions,thus resulting in higher ambiguity resolution success rate and more reliable of relative positioning.
global navigation satellite system(GNSS)relative positioningC-LAMBDAinteger ambiguity resolutionsuccess rate
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