Research On Measurement Data Processing Of Three-axis Platform Airborne Gravimeter

The airborne gravimeter of three-axis platform type as a new type of gravity measured method based on aircraft,which makes gravity measurement more rapid and extensive.With the rapid development of gravimeters,the analysis and processing of Earth's gravity field data is of great significance for resource exploration,earth science,military and navigation research.The research work is carried out around the measured data processing of the platform airborne gravimeter.The main contents of this paper are as follows:The overall scheme of measurement data processing is designed,which is mainly divided into three modules:correcting horizontal acceleration,calculating gravity anomaly and designing the software of gravity measured data processing.The module of the platform tilt correction: First,use the FIR low-pass filter to eliminate high-frequency noise in the platform-based airborne measured data.Then,using the one-step correction,the two-step correction and the platform error equation solution to calculate the platform tilt correction,and the real-time platform tilt correction method is a method for calculating the platform tilt correction value after estimating the platform misalignment angle by the Kalman filter equation of GPS/platform inertial combined navigation.The results show that: the one-step correction and the two-step correction method are equivalent;under the same filtering scale,the correction value of the platform error equation solution method is better than the other two methodsThe module of gravity anomaly solving: according to the gravity anomaly model of the second-order Markov process and the Kalman filter equation with gravity anomaly as the state variable,the measured data is processed.It is obtained that,under the same filtering scale,the gravity anomaly result of the carrier turning section calculated by the platform error equation solution is obviously better than the other two methods.In order to verify the correctness of the model,compared with the output of the GT-2A system on the same carrier aircraft,the difference between the gravity anomalies output by the two is less than 0.85 mGal.The module of measurement data processing software design: Design and implement the basic functions of three-axis platform-type aviation gravimeter measurement data processing on C# software platform,complete secondary development and stably complete data processing,and measure data of aviation gravimeter The research processed has important reference value.