WAVELET PRE-PROCESSING FOR HORIZONTAL ACCELERATION OF AERIAL GRAVITY MEASUREMENT
Tian Yanfeng 1) ;Li Shanshan 2) ; and Xiao Fan 3)
1)PLA 73603 Troops, Nanjing 210049;2)Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450052; 3)PLA 61365 Troops, Tianjin 300140
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.
Key words ：
aerial gravity measurement
prefilter
horizontal acceleration correction
Etvs correction
Fourier transform
wavelet transform
Received: 01 January 1900
Corresponding Authors:
Tian Yanfeng
Cite this article:
Tian Yanfeng ,Li Shanshan , and Xiao Fan . WAVELET PRE-PROCESSING FOR HORIZONTAL ACCELERATION OF AERIAL GRAVITY MEASUREMENT[J]. , 2012, 32(2): 115-119.
Tian Yanfeng ,Li Shanshan , and Xiao Fan . WAVELET PRE-PROCESSING FOR HORIZONTAL ACCELERATION OF AERIAL GRAVITY MEASUREMENT[J]. jgg, 2012, 32(2): 115-119.
URL:
http://www.jgg09.com/EN/ OR http://www.jgg09.com/EN/Y2012/V32/I2/115
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