一种LAMBDA整周模糊度解算正确性的评估算法

针对基于经典假设检验理论的模糊度正确性评估算法的缺陷,提出了一种依据概率指标的LAMBDA(Least Square Ambiguity Decorrelation Adjustment)整周模糊度解算的正确性评估算法。该算法能够有效解决实时动态差分定位中模糊度解算值的可信度问题,降低系统完好性风险。通过对跑车实验中GPS差分定位数据的直接处理及引入多径误差后处理,该评估算法可以在置信水平为99.5%的条件下实时有效地评估模糊度解算值的正确性。

An Algorithm for Evaluating Correctness of Integer Ambiguity Calculated by LAMBDA Method

In view of the shortcomings of the integer ambiguity correctness evaluation algorithm based on the classical hypothesis testing theory,this paper proposes an evaluation algorithm based on the probability index for the least square ambiguity decorrelation adjustment(LAMBDA) integer ambiguity solution.The algorithm can effectively solve the reliability problem of the integer ambiguity solutions in real time dynamic differential positioning and reduce the risk of the system integrity.Through the direct processing of GPS differential positioning data and the introduction of multipath error post-processing in the motion platform experiment,this evaluation algorithm can effectively evaluate the accuracy of the ambiguity solution value in real time under the condition of 99.5% confidence level.