| Résumé | This thesis describes an investigation into the design of a digital signal processing ultrasonic fish tracker. This work was initiated to overcome problems with an analog system presently used at Memorial University to track individual cod. Consisting of a local oscillator and several superheterodyne receivers, the analog system now works intermittently and gives unreliable results. A study into a more compact receiver design based on recent technological advancements was then commenced. The new receiver will connect to the exising four hydrophones, interface through a PC ISA bus, fit on a single PC proto-board, and track three frequencies simultaneously from each of the four hydrophones. Position resolution under 1m is achievable, over a 500 m range. |
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