A new approach for the validation based on the probabilistic properties of the integer ambiguity estimation

Abstract

准确确定载波相位整周模糊度是快速高精度GPS定位的关键,已有的检验GPS整周模糊度有效性的方法几乎均是基于其为非随机常量建立的,因而都存在一定的缺陷。本文在研究整周模糊度概率特性的基础上,提出一种基于LABMBAD算法的整周模糊度概率分布函数的检验方法。实际演算表明该方法简单有效,统计概念明确。 Successful integer carrier phase ambiguity is the key to fast and high precise GPS positioning. The methods that have been used for the validation of the integer ambiguity are almost based that the integer ambiguities are deterministic constants. Therefore,all of them have some shortcomings. In this paper, a new test method has been proposed for the validation of the correct integer ambiguity, which is obtained by the least squares ambiguity decorrelation approach(LAMBDA). The method is based on the probability of the integer ambiguity and discriminated by the probability of the correct integer ambiguity and the probability of the second likely integer ambiguity. The practical test results showed this method is simple and efficient, and its statistic concept is explicit.