DocumentCode :
2715765
Title :
Gyro Signal De-noising Based on a New Wavelet Threshold Function
Author :
Xue, Hai-jian ; Guo, Xiao-song ; Zhou, Zhao-fa ; Wang, Zhen-ye
Author_Institution :
Second Artillery Eng. Univ., Xi´´an, China
fYear :
2012
fDate :
11-13 Aug. 2012
Firstpage :
270
Lastpage :
274
Abstract :
Gyro random drift is a remarkable factor which influences the precision of north seeker, commonly used wavelet threshold method for gyro signal de-noising, but wavelet threshold function has some flaws, which affects the de-noising performance. Through analysing the advantages and shortcomings of soft and hard threshold functions and several existing improved threshold functions, puts forward a new double and adjustable threshold function, which has simple expression, without partition value, convenient adjustment, and excellent mathematical properties. The more important is that wavelet coefficients were processed with rapid contraction when absolute value is below the threshold in the threshold function, which retains true signal to a certain extent. The seminal work on "Doppler" signal and gyro to measurement signals have shown that the new threshold function overcome effectively the shortcomings of soft and hard threshold function, and restrain significantly the noise. Thus, it has certain application value.
Keywords :
signal denoising; wavelet transforms; Doppler signal; adjustable threshold function; convenient adjustment; denoising performance; gyro random drift; gyro signal denoising; hard threshold functions; new wavelet threshold function; partition value; soft threshold functions; Doppler effect; Noise reduction; Signal denoising; Signal to noise ratio; Wavelet coefficients; Wavelet packets; gyro random drift; threshold function; wavelet de-noising threshold;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Science & Service System (CSSS), 2012 International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4673-0721-5
Type :
conf
DOI :
10.1109/CSSS.2012.75
Filename :
6394313
Link To Document :
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