Integration and Application of Differential GPS Positioning System in Helicopter Airborne Gravity Measurement System
The differential GPS measurement system firstly uses a differential GPS base station with known accurate three-dimensional coordinates to obtain the positioning correction value,and then sends this correction value to the GPS mo-bile station to correct the measurement data of the GPS mobile station to improve the accuracy of GPS positioning.In this paper,the principle of differential GPS positioning is introduced.Relying on the geological survey project,the differential GPS positioning system is applied to the navigation of the helicopter aviation gravity measurement system,and attempts to establish an aviation gravity measurement system with differential GPS positioning navigation based on the helicopter plat-form.The integration method of the differential positioning system in the helicopter aviation gravity measurement system is explained through the establishment of base stations and mobile stations,and the positioning accuracy of differential GPS navigation is analyzed by solving data.The results show that compared with single-point GPS measurement,the positioning accuracy of differential GPS measurement is changed from 10 m to 0.1 m,which meets the requirements of aviation gravity measurement system for GPS positioning accuracy.
differential GPSgravity measurementpositioning and navigationpositioning accuracy
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