Accession Number : ADA313850

Title :   Experimental Evaluation of a Low Cost Acoustic Communication System for AUVs.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Reilly, Kevin D.

PDF Url : ADA313850

Report Date : JUN 1996

Pagination or Media Count : 100

Abstract : As the Navy has refocused its goals towards littoral warfare, mine countermeasures have become an area of special interest. The Naval Postgraduate School is developing an autonomous underwater vehicle to map shallow water minefields--a vital role in the Navy's overall plan for mine countermeasures. A key feature of the vehicle is its low cost, and to this end it uses a commercially available system called 'DiveTracker' for precise acoustic navigation and communication. This research experimentally evaluated the reliability of the DiveTracker communication system in conditions approximating those for which the vehicle is designed. It was concluded that highly reliable communication of short commands will be restricted to relatively short separation distances between nodes. The very shallow water acoustic channel is highly variant in both signal attenuation and background noise levels. The maximum range is limited by the background noise while the probability of correct message reception depends on the received signal to noise ratio. Initial data indicates that the low cost unit under development cannot communicate beyond 500 meters with a probability of a single roundtrip success greater than 34 percent. Several options are available for its improvement.

Descriptors :   *UNDERWATER VEHICLES, *REMOTELY PILOTED VEHICLES, *ACOUSTIC COMMUNICATIONS, TEST AND EVALUATION, LAND WARFARE, LOW COSTS, MINE COUNTERMEASURES, SIGNAL TO NOISE RATIO, THESES, RELIABILITY, SIGNALS, PRECISION, LEVEL(QUANTITY), SELF OPERATION, ATTENUATION, COMMUNICATION AND RADIO SYSTEMS, SEPARATION, SHORT RANGE(DISTANCE), AUTONOMOUS NAVIGATION, RECEPTION, RANGE(DISTANCE), MESSAGE PROCESSING, BACKGROUND NOISE, ACOUSTIC NAVIGATION.

Subject Categories : Marine Engineering
      Acoustic Detection and Detectors
      Command, Control and Communications Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE