Abstract 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 m...Abstract 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 the factory are obviously not optimal for airborne application. These coefficients are recalibrated by minimizing the difference between airborne data and upward continued surface data （external calibration） and by minimizing the errors at line crossings （internal calibration） respectively. An integrating method to recalibrate the above-mentioned coefficients and the beam scale factor simultaneously is also presented. Experimental results show that the systemic errors in the airborne gravity anomalies can be greatly reduced by using any of the recalibrated coefficients. For example, the systemic error is reduced from 4.8 mGal to 1.8 mGal in Datong test.展开更多
On the basis of a sinusoidal model of the disturbed horizontal acceleration,the spectrum characteristics of misaligned angle and horizontal acceleration correction are analyzed.In an airborne gravimetry test,the misal...On the basis of a sinusoidal model of the disturbed horizontal acceleration,the spectrum characteristics of misaligned angle and horizontal acceleration correction are analyzed.In an airborne gravimetry test,the misaligned angle of platform and horizontal acceleration correction are calculated.They are 5′and 3 mGal,respectively,when the flight is stable.展开更多
文摘Abstract 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 the factory are obviously not optimal for airborne application. These coefficients are recalibrated by minimizing the difference between airborne data and upward continued surface data （external calibration） and by minimizing the errors at line crossings （internal calibration） respectively. An integrating method to recalibrate the above-mentioned coefficients and the beam scale factor simultaneously is also presented. Experimental results show that the systemic errors in the airborne gravity anomalies can be greatly reduced by using any of the recalibrated coefficients. For example, the systemic error is reduced from 4.8 mGal to 1.8 mGal in Datong test.
文摘On the basis of a sinusoidal model of the disturbed horizontal acceleration,the spectrum characteristics of misaligned angle and horizontal acceleration correction are analyzed.In an airborne gravimetry test,the misaligned angle of platform and horizontal acceleration correction are calculated.They are 5′and 3 mGal,respectively,when the flight is stable.
