A portable infrasound generator.

Infrasound Laboratory, University of Hawaii, Kailua-Kona, Hawaii 96740, USA.
The Journal of the Acoustical Society of America (Impact Factor: 1.65). 05/2009; 125(4):EL148-51. DOI: 10.1121/1.3093797
Source: PubMed

ABSTRACT The rotary subwoofer is a novel low frequency transducer capable of efficiently generating infrasound from a compact source. A field-deployable version of this device may find application as a calibration source for infrasound arrays of the International Monitoring System (IMS) [(2001). The Global Verification Regime and the International Monitoring System (CTBTO Preparatory Commission Vienna International Centre, Vienna, Austria)]. A prototype tested at the IMS infrasound array I59US demonstrated the ability to insonify all elements of the array from a standoff distance of 3.8 km. Signal-to-noise ratios of continuous wave signals ranged from 5 to 15 dB, indicating the utility of this source to transmit controllable infrasound signals over distances of 5 km.

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    ABSTRACT: It is a basic application-supported technique to realize dynamic location. In order to make the precise locating method which is rather susceptible to the precise of the clock by the electromagnetic ranging ways only fit the continuous changing of the neighbor anchor nodes especially in the anchor-node-deficiency situation in which all the nodes move randomly in the environment where the electromagnetic disturbance, multipath effect and the NLOS (non line of sight) etc are mixed together. The asynchrony TDOA (Time Difference Of Arrival) ranging and analytic location based on the infrasonic and the electromagnetic signals is proposed in this thesis and the tracks are plotted by interpolative resume as well. The simulation results show that the method is robust and the average locating error is about 2~3 times as the ranging error.

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