Abstract：According to the spectrum characteristic of the horizontal acceleration correction in the aerial gravity measurement and the partition rules of wavelet transformation frequency band, the wavelet prefilter scale of the horizontal acceleration correction is deduced. On the basis of the correlation among the wavelet transform scales of the signal, as an example,some surveying data were preprocessed by Haar wavelet、db4 wavelet、db6 wavelet and sym6 wavelet, and the results are compared with the results from FIR low pass filter in common use. The comparison shows that the precision of the wavelet prefilter is higher than the FIR low pass filter in the preprocessing of the horizontal acceleration correction and it is more symmetrical as preprocessed by db serial wavelets.Thus it is proposed that the Daubechies wavelets or the sym8 wavelet with much longer branch are more useful in the preprocessing of the horizontal acceleration correction.
