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.
关键词
全球卫星导航系统/相对定位/约束的最小二乘模糊度降相关平差算法/整周模糊度解算/成功率
Key words
global navigation satellite system(GNSS)/relative positioning/C-LAMBDA/integer ambiguity resolution/success rate
万方数据