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Tropospheric and ionospheric delays are currently affecting the accuracy of GPS positioning to further improve the main error , but also affect RTK positioning accuracy and effective range of major errors. In order to improve continuously operating reference station positioning accuracy and effective range , this paper, the GPS signal tropospheric and ionospheric delay precision correction model and regional tropospheric and ionospheric real-time fitting method were systematically studied , mainly related to tropospheric and ionospheric the relevant knowledge of basic research , tropospheric and ionospheric delay solver theory and method of research, as well as tropospheric and ionospheric delay model scope of several parts , the author seeks the atmosphere in tropospheric and ionospheric delay on the GPS continuous operation impact of reference stations positioned to give full pay , more in-depth research for the future lay the foundation for further research work . This article consists of three elements: a , background description and related basic research system introduction and summary of research work has laid a foundation , mainly related to the following : GPS positioning atmosphere ionospheric and tropospheric delay error of purpose , significance, the main research results, and other methods . Second, the study CORS real-time dynamic positioning systems theory , as well as the advantages and disadvantages , and compared to other conventional RTK . Third, ionospheric and tropospheric delay correction theory and methods and related content research for this article body , including: a study of ionospheric and tropospheric basic concepts , analyzes produce ionospheric and tropospheric delay reasons, study the basic principle of delay correction . (2) study of several correction model , the ionosphere is mainly frequency correction method, the troposphere is mainly Hopfield model ,萨斯塔莫宁model and Brandt models of several correction model . 3 study CORS real-time dynamic positioning ionospheric and tropospheric corrections , there are mainly surface fitting, distance-weighted , multi-faceted function method and so on.
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