航空重力垂直加速度改正滤波方法对比研究

Comparing Research for Vertical Acceleration Correction Filtering Methods in Airborne Gravimetry

根据航空重力测量的基本原理,阐述了用于航空重力垂直加速度改正的频域滤波器和时域滤波器的设计方法,以此为依据设计了用于垂直加速度改正的低通滤波器和卡尔曼平滑滤波器,并利用滤波器对航空重力实测数据进行了处理试验。试验结果表明:两种滤波方法都能够实现垂直加速度改正,而时域滤波器处理精度较高,与解算参考标准的误差低于1mGal。

Based on the principle of airborne gravimetry, the vertical acceleration correction methods are demonstrated in this paper. Then, the methods based on low-pass filter and Kalman smoother are designed for the correction respectively. According to the diversities of vertical acceleration correction methods, the filter and the smoother are applied in measurement data processing which is from practical airborne gravimetry. The result of the processing shows that both of the filter and smoother can process the measured data to obtain the gravity anomaly and the errors is about 1 mGal. Specifically, the error based on Kalman smoother is less than 1 mGal.