INFRASONIC ARRAY FOR IMPROVING SIGNAL-TO-NOISE RATIO

Wind noise at the surface of the Earth limits the detection of infrasonic waves with periods longerthan 10s.For infrasonic arrays designed to improvc the signal-to-noise ratio of the infrasonic waves,it is usually assumed that the background noise due to wind turbulence is incoherent between thearray elements. The principle and the technique for designing the infrasonic array are presented,the calibrationmethod of the array is described in detail and the experimental results are given in this paper. From a large amount of statistical data,we get the result improving a signal-to-noise ratio of12 dB with the infrasonic array.