| In recent years,with the continuous development and utilization of coal resources,it not only ensures the sufficient energy supply,but also damages the natural resources to a certain extent,resulting in the occurrence of various geological disasters such as land subsidence,which has brought great impact on the production and life of the people in the mining area.In order to protect and improve the mine geological environment and prevent the mine geological disasters,it is necessary to study the monitoring and early warning technology and method suitable for mining area by using new technology.With the global navigation satellite system(GNSS)gradually entering the era of coexistence of multiple systems,especially China's Beidou satellite navigation system(BDS),the emergence of multi frequency and multi-system provides different technical solutions for mine deformation monitoring.The development and application of multi-frequency and multi-system is conducive to improving the accuracy of positioning results and improving the reliability of navigation and positioning.At the same time,the deep integration and development of satellite navigation and positioning technology with mobile communication technology,Internet technology,space-time big data mining technology has gradually expanded the theoretical research and practical application of satellite navigation and positioning technology in the field of mining deformation monitoringThis paper mainly uses GPS and BDS combined system multi-frequency data single epoch to calculate the deformation,so as to realize the accurate monitoring of the surface movement and deformation during coal mining.It mainly involves the theoretical basis of GPS and BDS combined system fusion,the quality analysis of the combined system observation value,the data processing model of the observation value fusion between different systems,and the ambiguity of the combined system based on the BDS tri-frequency solution.By revising or rebuilding existing algorithms and models,programming and developing corresponding software and continuously improving software functions,the requirements for reliability and high precision in mine surveying can be met.The main work of this paper is as follows:1.Detailed description of GPS/BDS multi-system multi-frequency fusion positioning theory.From the perspective of time-space correlation,the correlation analysis of GPS/BDS time system and space coordinate system is carried out to achieve a stable combination of dual systems.The differences between GPS/BDS combined systems and the main problems of observation data processing are analyzed in detail.2.Aiming at the fusion processing problem of GPS/BDS combined system observation data under different frequencies,the single epoch solution model of GPS/NDS combined system was constructed and optimized.Studies have found that the model can effectively increase the number of satellites visible and the success rate of ambiguity fixation,which is beneficial to improve the reliability of the model.Through experimental research,it is found that the model can achieve corresponding functions.3.According to the characteristics of mine deformation monitoring,a GPS/BDS double-difference ambiguity fixed algorithm with three-frequency Beidou constraint is established.First fix the ambiguities of two ultra-wide lanes(0,-1,1)and(1,4,-5);then use integer transformation to get the integer correlation with the combination of two ultra-wide lanes,and the ionospheric delay coefficient is related to three The ambiguity combination with the fundamental frequency ionospheric coefficients as close as possible(so that the algorithm can be suitable for the solution of longer baseline ambiguity);finally,the fixed ambiguity Beidou system is used as a constraint,and the double difference of the GPS system is solved by a single epoch Ambiguity.4.After the completion of the model construction,the study found that there were problems such as the equation rank deficit in the model.Through the analysis of the ill-conditioned problems in the model,a method was found to solve the ill-conditioned model.Aiming at different frequencies,the Tikhonov regularization principle is used to solve the single-frequency data problem,and a single-frequency single-epoch solution model based on the combination of GPS/BDS is established.For dual-frequency data,in order to solve the problem of the rank deficiency of the equation,a dual-frequency single-epoch solution model based on the combination of GPS/BDS is established by introducing pseudorange observations.Finally,using the collected experimental data to verify and analyze the positioning effect of the algorithm,the results show that the constructed model can basically meet the needs.5.On the basis of the above-mentioned theoretical research and function model construction,a single epoch calculation software based on the GPS/BDS combined system was developed,and the corresponding functions of the software were introduced.Using the laboratory's high-precision three-dimensional mobile deformation platform to analyze and test the performance of the software,the experiment shows that the solution results of the developed software basically meet the design requirements.In order to further study the performance of the algorithm and software of the combined system model,taking the 1222(1)working face of Zhujidong Mine as the research object,the application of the GPS/BDS combined system deformation monitoring software in the surface deformation monitoring of the mining area is studied.Figure[45]table[26]reference[124]... |
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