Airborne gravimetry surveying is a geophysical survey method with the aircraft as a carrier. It can rapidly and efficiently extract middle and high frequency earth’s gravity field information in large areas. The commercialization of aeronautical gravity measurement technology is due to the maturity of dynamic differential GNSS positioning technology, which greatly improves the accuracy of dynamic velocity measurement and acceleration calculation of the carrier. And the accuracy of carrier dynamic positioning using the differential GNSS positioning technology depends on the accuracy of the ground reference station coordinates. In the actual work, through the establishment of GNSS control network to calculate the ground GNSS base station coordinates on the synchronization observation of national GPS geodetic control network, it not only spends much time and needs much cost but also has many difficulties in establishing the ground GNSS base station in the rare swamp, plateau, desert, unmanned areas and distant mainland’s island reef areas. With the construction of CORS station in China, the precision and the net dimension have been continuously improved. By using the data of CORS station, the method for determining the coordinates of the ground GNSS base station is employed by GAMIT, which has become a new trend. With the actual data of a survey area as an example, the authors conducted check and analysis of the base station coordinate accuracy and the measured gravity anomaly of the two methods, and readers can understand the application effect of the CORS system in the ground GNSS base station calculation in airborne gravimetry. It shows that the CORS system can not only meet the accuracy requirements of airborne gravimetry, but also improve the work efficiency.
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CHEN Hao, ZHANG Wen-Zhi, SHU Qing, LI Jian, YANG Yi, ZHANG Kai-Song. The application of the CORS system to ground GNSS base station calculation in airborne gravimetry. Geophysical and Geochemical Exploration, 2020, 44(6): 1408-1414.
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