| At present high-accuracy GNSS real time dynamic located and determination of geoid technology becomes a hot spot in geodesy field studies. Routine GPS measures especially tradition RTK (Real-Time Kinematic) located technology is one kind of Shan criterion station and high-accuracy carrier wave phase observed value-based real time development location technology, whose school assignment cost is big, operation is asked miscellaneous and trivial. With the ceaseless rise that people demands to allocation accuracy and school assignment efficiency, how to shake off tradition RTK complexity and realize the localized problem of high-accuracy development within bigger range being outstanding especially. At the same time , the development of Internet , computer , wireless communication technology in recent years swift and violent, real-time transfer and handle large amount of data to become possibility by them. Must seek one kind of the new's, high-effect's, low-priced , real time high-accuracy development located mode . Under these need and condition, continuously operating GNSS reference stations system having appeared , we are called the person for short generally being CORS system. The network RTK technology has it is CORS technology model to apply, has become a model of GNSS high-accuracy development located technology represents at present.With development of GPS technology, the height measurement becomes rapid and reliable; besides, geosciences such as study of surveying and mapping, the physics Geodesy, the earth dynamics and oceanography that studies need (quasi-) geoid provides the basis geospace information with high-accuracy part or the area earth applying need. Therefore, essence determination area (quasi-)geoid already becomes economical on the technology and application being able to be carried out; the determination of geoid having very good practical, immediate significance and economy significance.At the same time, with the fact that the CORS technology is able to provide real time high-accuracy measure, especially flat surface location high-accuracy fixed; but earth third-dimensional information of feasible space of determinated geoid technology development gaining the means is further concise, high-effect; if we combine the CORS technology and the (quasi-) geoid, we can achieve the space high-accuracy real time 3-D located.Having studied the CORS technology, network RTK allocation technology basic theory, and having measured basic theory and the earth to the physics earth, it works something that:1. In union CORS technology and the earth spending development of technology we discuss the effect of CORS in the determination of (quasi-)geoid; and CORS is beneficial to fix the (quasi-)geoid.2. Geoid has been skill in union CORS technology characteristic, height anomaly under the control of net has carried out comparison , analysis on geopotential modern under the control of net and tradition elevation , the frame has covered choice , the effect as with a net and to modern elevation in abnormal under the control of net , the cloth that modern abnormal elevation under the control of net counts has set up , elevation under the control of net accuracy has analyzed , the overall tie has dispatched having carried out investigation and discussion , has analyzed and by the fact that the relevance example is in progress.3. By the fact that elevation intends to agree well with the method observation, and the comparison to gravity field model to GPS, have discussed the characteristic property making use of the earth field of gravity model to move middle long wave component in getting rid of elevation anomaly and gravity abnormally, getting the meticulous area field of gravity. Then choosing and fitting carries out the abnormal sub area of gravity, the method applying this similar carries out abnormal elevation areal choosing and fitting. At the same time it also has discussed the areal joint smoothness.4. According to the three outlines, compute the (quasi-)geoid on region. |
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