The Research Of High-precision Self-positioning Technology Of Observed Points In Distributed Seismograph

With the development of society, the people's demand of metal mineral resources grow day by day, but seismic instruments which specifically target metal mineral have not appeared at home and abroad. It is of great significance that do independent research and development on distributed without-cable seismograph which is applicable to complex terrain ore and the random combination of vibroseis systems, carry out studies on the seismic wavefield characteristics under complicated geological conditions and the key technical of ore seismic data processing and explaination, establish deep metal mine earthquake detection system of China's own knowledge property rights. At present, any variety of seismic recording instruments at home and abroad have not the ability to access reliable location information of their own. In order to achieve high-precision self-positioning of seismometer, GPS positioning technology was firstly introduced to the seismograph, and the seismograph obtainin satellite observation data in getting seismic data at the same time, after post-processing mm-level positioning accuracy can be achieved to realize an accurate self-positioning .Traditionally, accessing the distance between points and measuring the precise three-dimensional coordinates of the site are measured by surveyor manually, or by using total station or point range to find coordinates, time-consuming and laborious, with a number of constraints in surveying (cabling is more difficult in special environment and accuracy is not high enough). At present, GPS positioning technology has penetrated into the wider economic development and many areas of science and technology, in particular have the profound impact on all aspects of the classical geodesy. GPS has been widely used in navigation, mapping and many other fields , because that GPS with high degree of automation, can be synchronized for all-weather observations, need not pass, can provide high-precision three-dimensional position,velocity and time information for different types of users. GPS static relative positioning technology not only have high positioning accuracy, but also removed the relatively cumbersome aspects of the geological survey work from the conventional seismic exploration, saving a great deal of manpower, material, time, and greatly enhance the measurement efficiency of worker and cut construction costs, can meet the measuring needs of the distributed seismograph.Based on high-precision positioning of GPS, as well as the need for seismic exploration work, dual-frequency GPS OEM Board are used and integrated into distributed seismograph, so that seismograph seismic data are collected at the same time the GPS data collection, with the formation of a static relative positioning functional integrated system。After measured several hours , the data recorded on all points are processed by the post-processing software of static positioning, and then the coordinates of observation points can be measured with accuracy of mm-level positioning. In addition, GPS static relative positioning technology can also be used in instruments of wells crack earthquakes. The introduction of GPS systems to distributed seismograph laid the foundation for seismic exploration technology to achieve the realization of modernization and automation and high-tech , and at the level of the world's leading in the same industry .As a result of the high-precision observations, large amount of data information, and complex analysis of data-processing, to develop the corresponding data-processing software of GPS high-precision static relative positioning , and to be brought into the distributed seismograph is particularly important. From above, the study of the data-processing methods of GPS high-precision static relative positioning and the development of the corresponding data-processing software has an important significance on seismic exploration work.In this paper, the high-precision GPS static relative positioning technique are learned firstly, then commercial post-processing software are used for data processing, and high accuracy are obtained to verify the feasibility of GPS static relative positioning technology for distributed seismograph. A more in-depth study on the data-processing model and the corresponding algorithm of GPS static relative positioning have been done, with the measurement and analysis of three-dimensional coordinates of observation points and so on . On the basis of the above, a set of post-processing software of static relative positioning which applicable to distributed seismographs observation points, have been developed, using VC + +6.0 as development tools, designing algorithm according to the mathematical model, with the results of text as output format. The paper has six chapters:The first chapter was the introduction, and it mainly illustrates the background to the study of the issue, the development of GPS positioning technology at present, as well as the significance of the subject and purpose of the study, and finally a summary of the main contents of this paper.Chapter II gived a introduction to the basic knowledge of post-processing of GPS relative positioning, in order to lay the foundation for data processing. It briefly introduced the basic knowledge of GPS system, focused on the format and content of the GPS navigation files and observation files, as well as the error types and the corresponding mathematical correction model of the observations in measurement,and finally introduced the method of calculating satellite coordinates.Chapter III as part of GPS relative positioning, firstly introduced the algorithm of single-point pseudorange positioning, and then focused on the principles and methods of the relative positioning, the structure of double-differential equations, the equations, as well as the calculation of the ambiguity, the final exlained in detail the principles and mathematical methods of GPS network adjustment, to provide a theoretical basis for the design of data structures in the next chapter.Chapter IV gived the design for software development and functional modules, firstly introduced the overall structure of software design and the design of function modules, and then presented in detail the document-read module, the error correction module, the calculation module of satellite coordinates, the baseline calculation module,netadjustmentmodule implementation, including the design of module process map, the design of data structure used and the design of main functions. Chapter V provided the experimental test results. The actual datas collectted in a mine in LiaonNing province were post-processed (calculation and adjustment), to get the three-dimensional space coordinates and accuracy of observations , to verify the the feasibility of software and the feasibility of applying the GPS relative positioning technology into the distributed earthquake instruments. Finally it compared the results with commercial software and do a simple analysis.Chapter VI summed up the full text , summarized the main research work and results, and gave further suggestions for improvement for shortage.