Cross-Coupling Correction for LaCoste&Romberg Airborne Gravimeter

The cross-coupling corrections for the LaCoste&Romberg airborne gravimeter are computed as a linear combination of 5 so-called cross-coupling monitors,the weight factors(coefficients) determined from marine gravity data by factory are obviously not be optimal for airborne application.These coefficients are recalibrated to minimize the difference between airborne data and upward continued surface data(external calibration) and to minimize the errors at line crossings(internal calibration) respectively.An integrating method to simultaneously recalibrate the above-mentioned coefficients and the beam scale factor is also presented.Numerical results show that the systemic errors in the airborne gravity anomalies can be greatly reduced using any of the recalibrated coefficients.For example,the systemic error is reduced from 4.8 mGal to 1.8 mGal in Datong test.