The Elementary Theory And Software Realization Of GPS Baseline Solution

Rapid GPS (Global Positioning System) carrier phase precision relative position is referred as direction in GPS technology. Conventional GPS static relative positioning measurements generally require observing a lot dozen minutes, or even longer time to accurately solve the baseline, to satisfy the requirements of precision, but it is indeed time-consuming.Which can of two key parts:fixing integer ambiguity resolution and detecting cycle slips that are researched in theory as well as by experiments in this dissertation.1. Paticularly analyse the GPS double difference observation model, which is the basis of LAMBDA for searching integer ambiguity. Firstly, analyse the model of GPS double difference observation, and used an example to missd the integer feature and the mean square error of ambiguity, evaluate the precision of float solution in this way.2. The important approach to carry out GPS data processing quickly is to search double difference integer ambiguity quikly using LAMBDA.The two main steps of LAMBDA are the decorrelation of ambiguity and the searching and fixing of ambiguity.The first step is very important,because it can improve the speed of ambiguity searching efficiently.In this paper,the integer Gauss transformation is used to decorrelate the space of ambiguity searching.In the example, discuss the realiability of integer ambiguity obtained through searching and compare the rate of ambiguity searching before and after decorrelating.3. A modified polyial fitting method is used to detect and repair the cycle slips in this paper, and the result proves that the method can detect and repair the cycle slip in any condition. And cycle slips are repaired detected and recovered by this system, even only one cycle.4. Based on the theory, the author developed software named AGBP (AUST GNSS Baseline Processor). Overall and related modules flow charts about the software were gaven in this paper. In order to verify the theory of the paper, we compared the results of business software Pinnacle with this software, and obtained the conclusions that AUST GNSS Baseline Processor's results can meet the requirements of relative accuracy.