Wind induced infrasound in the atmosphere

Characteristics of atmosphere infrasound noise field have been studied by measuring and analyzing the infrasound noise field in the atmosphere. A set of space correlation radii of noise corresponding to wind speed 4 m/s has been obtained, which can be taken as the tentative basis for an acoustical array design. At the same time, the wind speed-pressure relation curves have been measured and calculated, and the antijamming ability of the array receiving infrasonic signals and noise-reducing tube is obtained. The following conclusions can be obtained from the present calculations, waveform diagrams, and the field measurements: (1) The spatial correlation radii of the noise caused by the wind are small. (2) The measured curves for wind noise are in accordance with Bernoulli theorem basically. (3) The correlation detection is advantageously available for antinoise. (4) The different averaging duration of the wind noise will cause different results. (5) The main source of natural noise background on ground is the aerodynamic noise produced by local surface wind. The main period lies within 1 to 100 s.