Research On Baseline Processing And Its Application In Deformation Monitoring

The purpose of deformation monitoring is to determine the size of deformation andit’s space state and time characteristics by a certain monitoring methods.Satellitepositioning technology for its all-day, high-precision, automated, easy to operate thestation without having to pass, as well as the advantages of monitoring is widely used inmining. However, there is no special software to process these monitoring data. They arealways processed by general satellite data processing software.In this paper, combined with the characteristic that regional of deformationmoitoring is smaller, the data processing system is developed to offer specialized servicefor deformation monitoring. The system is divided into two processes when dealing withmining deformation monitoring data. they are baseline solution and deformation systemwith a baseline vector of monitoring sites do deformation system.Combined with the characteristics of deformation moitoring, the software use thedouble difference observation in the process of baseline processing. Because the distanceto the satellite stations are almost equal when the baseline is short. So errors caused bytropospheric and ionospheres delays and satellite orbit deviation can be regarded assystematic errors. Therefore, the use of double-difference model not only can welleliminate satellite clock error and phase center offset but also can eliminate the errorscaused by the track deviation and atmospheric delays. This paper focuses on cycle slipdetection and repair and determination of ambiguity. Comparison of several commonmethods, choose to use polynomial fitting, cycle slip detection, using the least squaresmethod to the relevant solver integer ambiguity.Considering the characteristics of the deformation moitoring, using a single baselinesolution line data processing algorithms when using the solution considered baselinedeformation analysis. And use the single baseline method and the conventional method toprocess the same set of data. Then compare the results of the two methods. Thiscomparison highlights the advantages of a single baseline method in monitoring dataprocessing.In terms of data output, add the image display function that other softwaredoes not have. This feature can automatically and intuitively show the amount ofmonitoring points’ deformation and deformation trend.The program is developed on the platform of VC6.0based on VC++Languages.when solver data, it calls the function from MATLAB which has powerful useful library.And display graphics by calling graphics function in OpenGL. The software is achievedfrom introduction of satellite standard data to the functions of the deformationinformation text data output and graphical output. It tests the practicability of thesoftware combined with engineering.