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Language: English

Pages: 392

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ISBN: B007AVVLBO

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This thesis records the overview of the transmitter functionality of a short-range underwater acoustic modem. This prototype modem was once fabricated by means of contractor Teledyne Benthos, Inc. and is pointed out as version ATM-90X. It was once built to be used within the Seastar underwater neighborhood zone community (LAN). The ATM-90X modem is needed to have the capacity to shifting quite a lot of electronic info at a variety as much as 500 m utilizing the 33–55 kHz acoustic frequency band. The modem’s transmitter functionality used to be evaluated in time period of its transmit frequency reaction, vertical beam development, and greatest resource point. Underwater acoustic measurements have been performed in an anechoic water tank and the knowledge have been analyzed utilizing sign processing ideas together with Hilbert transforms, autocorrelation, and pass correlation. The transmission features of the meant underwater acoustic verbal exchange channel have been modeled to figure out the mandatory modem working functionality within the most sensible and worst case occasions. The measured functionality features have been evaluated within the context of the conversation hyperlink margin (i.e., the surplus signal-to-noise ratio) linked to the modeled channels. the consequences convey that (1) the modem transmit frequency reaction doesn't have appropriate flatness around the whole 33–55 kHz band; (2) the beam trend within the vertical airplane has an excellent hemisphere trend; (3) expected greatest resource point is one hundred seventy five dB re 1μPa-m at broadside of the modem. in accordance with the evaluated functionality, the ATM-90X modem provides a profitable conversation hyperlink with the top facts expense on the variety of 500 m within the best-case scenario (least noise). notwithstanding, within the worst-case scenario, the verbal exchange hyperlink will fail to arrive functionality pursuits.

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