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《Infrared and Laser Engineering》 2007-01
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Application of median filter in wavelet domain in the signal processing of the laser gyro

PENG Yun-hui,LIU Yun-feng,YANG Xiao-gang,HOU Qing-jian,MIAO Dong(303 Section,Second Artillery Engineering Institute,Xi′an 710025,China)  
The various random noises in laser gyro are the main factor affecting the accuracy.In accordance with the property of its noise,traditional filtering methods have many shortages.In order to decrease the random error and improve the measuring precision of laser gyro,a median filter method in wavelet domain is presented to denoise a set of zero drift signal of laser gyro,and the method of Allan variance is used to analyze the filtering result quantitatively.The result shows that the filtering algorithm can produce the better filtering effect than median filter and wavelet soft threshold denoising,decrease the angle random walk,rate random walk,rate ramp,the bias instability and quantization noise,and improve the stability of laser gyro drift output.
【CateGory Index】: TP212
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