Research On Method Of Mining Subsidence Monitoring Based On Beidou And GPS Integration

We built a basic mathematical model to solve the deformation information combined with the mining subsidence monitoring in single epoch which is fast and with high-precision based on the analysis of the basic theory of Beidou/GPS deformation monitoring and the similar single-difference algorithm. In addition, we researched the algorithm for weaken the main error sources and developed a special software which can solve and manage the deformation information fleetly and high-precision. The following are the main research results in this paper.1. Firstly, we discussed the integration of Beidou/GPS coordinate system and time system which provided the foundation for deformation monitoring theory of Beidou/GPS system. In addition,we discussed the undifference model, the single difference model and the double difference model which were frequently used in Beidou/GPS positioning. We came to a conclusion that fix power by using elevation angle was best by comparing several stochastic models which analyzed in this paper.2. We extended the application scope of the similar single-difference model which calculated the deformation information in single epoch from the GPS system to Beidou/GPS dual system based on similar single-difference algorithm. We proved that double difference ambiguity can be fixed directly by prior information when the deformation less than half wavelengths by using mathematical method.A new single epoch algorithm which based on SSDM and the principle of combination wavelength were proposed for calculating wide range deformation. Firstly,we used the pseudo-range differential to solve the approximate coordinates of monitoring points and fixed double difference ambiguity of two ultra wide lane. We calculated the double difference ambiguity of L1/L2and B1/B2carrier directly by using the linear relation between them and then we substituted the ambiguity into SSDM model to get the deformation. The method solved the problem that SSDM cannot applied for solving the deformation of wide range. Finally, two experiments validated the correction of this method.3. This paper analysised the error correction model and researched the final deformation influence from various errors through the related satellite error, the receiving equipment error and the propagation path error.In addition,we researched on the probably problem in the algorithm. The ultra wide lane double difference ambiguity would be unstable when the deformation of monitoring points approaching or more than the half of the wave length of ultra wide lane. So we must fix the ultra wide lane double difference ambiguity by searching instead of calculating constraint solution directly. In addition, we must avoid the condition that we failed fixing the ultra wide lane double difference ambiguity, so it was necessary for us to select a suitable elevation angle. In order to improve the efficiency of searching ambiguity, we proposed a method for sieving ultra wide lane ambiguity one by one to eliminate incorrect combination which increased searching efficiency. A example showed the method of single epoch to calculate deformation at last.4. We studied the deformation monitoring method with Beidou/GPS technology on the mining surface subsidence. Take the Gubei coal mine first coalface of12326on the north one (6-2) upper panel for example, we calculated deformation monitoring with the proposed algorithm and showed the process of it from three aspects which were the design of the monitoring plan, the high precision three-dimensional Beidou/GPS deformation monitoring benchmark network and the calculation of deformation information. Calculated results showed that the method proposed in this paper can meet the requirements of application in mining subsidence monitoring basically.5. We developed a software for calculating deformation quickly based on Beidou/GPS technology by using the proposed algorithm. The paper introduced the main function of the software and showed the basic running process of it with a experimental example. The software has a friendly user interface, quick operation and convenient to use. It calculated results accurately and reliablely. It also provided more abundant results etc. What’s more, It could not only be used in production but also be used in scientific research.