Filtering and processing for the airborne gravimetry data

Our first airborne gravimetry system(CHAGS) is brought to success in 2002. In this paper we designed the filtering flow chart of the CHAGS observed data and focused on the investigation on the filtering method of the specific force and the various corrections. A method named 'Two-Steps Filtering'is advanced later. Based on the real data from one airborne gravimetry test, the accuracy of the airborne gravity anomalies are compared and analyzed. The results indicated that for a half wavelength of 8.0km the inner accuracy of the airborne gravity anomalies is better than ±3mGal for the repeat surveying lines and the external accuracy is better than ±4mGal when compared to the upward continuation reference.