Application of precise point positioning technology in airborne gravity measurement

Yan Xincun, Ouyang Yongzhong, Sun Yi, Deng Kailiang
2014 Geodesy and Geodynamics  
The precise point positioning ( PPP) technology is applied to an airborne gravity survey. By analyzing the advantages and disadvantages of several velocity and acceleration measurement methods and in combination with an actual marine gravity survey, the position difference method is confirmed to be a useful survey method for velocity and acceleration. Finally, the practicability of using PPP in airborne marine gravity survey is verified by measured data. Introduction Developments in marine
more » ... y technology have resulted in a gradnal shift in measurement mode from the surface to air. Due to slow velocity, traditional shipborne gravity measurement has low work efficiency. Moreover , it can be easily influenced by obstacles such as reefs or oil field apparatus, and the working area is limited. However, airborne gravity measurement has higher work efficiency , the working area is not limited, and it meets the demand of rapid gravity measurement. Airborne gravity measurement is conducted on an aircraft carrier using the airborne gravity measurement system to measure near-space gravity acceleration. To determine a location with high precision , velocity and acceleration of the aircraft is used for airborne gravity measurement. Determination of the correct position and velocity reveals the space-time data of the plane. In addition, these factors are necessary for computing eotvos, horizontal acceleration, and spatial corrections. Accurate determination of the vertical acceleration of the Corresponding author: Yan Xincun,E-mail:yxcfh101@ 163.oom aircraft is crucial for separating the vertical disturbing acceleration and gravity signal. Thus, accurate determination of the aircraft vertical disturbing acceleration strongly influences that of the gravity anomaly[ 1 -'l. With the expansion range of ocean measurement and because of the difficulty in building a base station, traditional differential GS technology has been unable to meet the demands of airborne gravity measurement. However, precise point positioning ( PPP) can satisfy the demands of airborne gravity measurement without the use of reference stations and can provide position , velocity , and acceleration information of high accuracy for airborne gravity measurement. 2 Selection of velocity and acceleration measurement method Many methods are used to measure velocity and acceleration by GPS such as position difference , Doppler observation value, and carrier phase difference. A relation exists among these three methods because they are all based on the definition of the velocity formula. However, differences in calculation procedures and observation values lead to different degree of hypotheses approximation for each method; thus, the accuracy of the
doi:10.3724/sp.j.1246.2014.04068 fatcat:ba62iugmynbnzol4xtutfzywxu