WANG Jun1 WU Lixin1 CUI Jie1 Jim Lynch2 Arthur Newhall2
(1 National Lab. of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100080)
(2 Woods Hole Oceanographic Institution USA)
Received Jun. 13, 2006
Revised Jul. 31, 2006
Abstract As for a flexible horizontal array deployed in the sea, it is difficult to obtain each sensor's precise relative position. Therefore a method of array shape calibration is proposed. The method is described as follows. Firstly two separate auxiliary sources are deployed. Secondly tune delay of each sensor's received signal is estimated. Finally, with the aid of GPS location of the sources and the horizontal array, relative sensor positions of the horizontal array can be determined. The estimation of relative sensor positions is unbiased. Simultaneously, simulation analysis has been done to estimate its standard variance, and the optimal flare angle of the two sources has been derived. Data of 2001 Asian Sea International Experiment have been used to validate the method. After array calibration, measured source azimuth angle agrees with the real one, and measured array gain agrees with the theoretical gain. In conclusion, the theoretical and experimental results both show that the method can determine each sensor's relative position precisely.
PACS number: 43.60, 43.30