Single Epoch Gps Deformation Monitoring Data Processing Theory And Related Methods

Because of its high precision of GPS carrier-phase relative position, GPS becomes an important method of construction deformation monitoring, especially widely applied in bridge or dam deformation and so on. Along with the progress of technique of GPS hardware and soft, real time automatic monitoring system with high precision will be the trend, it can realize the automation of collecting data and integration of work inside and outside. During the constructing of those systems, real time data processing is one of critical problems.The paper emphasizes on the method of GPS single epoch algorithm and the influence on result of deformation survey because of correlation among observations, the paper researchs the application of the algorithm of data processing in deformation monitoring system, and the influence on precision of deformation monitoring. Firstly, The paper analyses procedure of data processing of single epoch algorithm, and researchs the method about how to fix ambiguity and pick-up deformation value, it also analyses algorithm with constraints and model of single epoch data processing. According to the result of example, this algorithm with constaints and model are effective and practicable to get deformation value of the monitoring points. Secondly, the paper elaborates many ways to analyze and forecast deformation value, and proposes to use total variance methods and hypothesis and test to analyze, and use regressing and Kalman filter to forecast deformation information. It is confirmed by the example.Correlation will affect the result, and it should not be neglected in defonnation monitoring system. Lastly, The paper analyses mathematical correlation between data, and gives weight matrix of mathematical correlation, and elaborates physical correlation, gives function of time correlation according to residual errors based on time serial, the correlation time is above 200 seconds, and analyses influence of time correlation. This paper also analyses spatial correlation, and elaborates the effect of multi-path. According to characteristic of deformation system and single epoch algorithm, the paper designs a system primaryly, it uses single epoch algorithm and data analyzing methods, andconsidering data correlation at the same time.