Research On The Method Of Gravimetry Data Processing

Gravity field, which reflects the interior structure of earth, is the physical characteristic of the earth. It is of great significance to the navigation, military and resource exploration. Achieving high accuracy and resolution of the gravity anomaly is the key to the gravimetry system. The filtering technology of the data processing after the gravimetry is of great importance to obtain the high precision gravity field information. The main works are summarized as follows:Due to the spectrum characteristics and the requirement of the resolutions of gravimetry data, technical parameters are attained to achieve the low pass filter. The window function of FIR low pass digital filter, Chebyshev ripple FIR digital filter and the Butterworth IIR digital filter are designed on the VC software platform.As to strapdown gravimetry system, the cut-off frequencies are determined based on the spectrum characteristics and energy characteristics of the gravimetry data. In order to eliminated the large amount of noise, the window function of FIR low pass filter, Chebyshev ripple FIR filter and the Butterworth IIR filter are used to process the surveying data. In order to evaluate the accuracy of the three filters, repeated flight lines are used to test the coherence of the gravimetry. The result of the Chebyshev ripple FIR filter is good.As to platform gravimetry system, the window function of FIR low pass digital filter, Chebyshev ripple FIR filter and the Butterworth IIR filter are designed to eliminate the high frequency noise. In order to evaluate the performance index of gravimetry system, repeated flight lines are usually used to test the coherence of dynamic survey of gravimetry. Based on the calculation resultsof interior accord accuracy, the accuracy of Chebyshev ripple FIR filter is higest.