A dynamic configurable sensor for fractional-octave- band underwater acoustic measurements

This paper reports on an underwater acoustic sensor used to demonstrate dynamic configurable Field Programmable Analogue Array (FPAA) devices. A single FPAA device was connected to a microcontroller and programmed to sweep through a set of fractional one-third octave filters with centre frequencies from 100 Hz through 20 kHz. Fourth order filters were designed using a cascading topology and approximated using two second order filters available in the FPAA. Sweep timing characteristics were controlled by the microcontroller to allow for settling time and a predetermined estimation uncertainty for each fractional octave band. Laboratory testing compared the filters with the relevant ANSI standard. Field measurements were conducted in the shallow waters of Cockburn Sound. Results of laboratory and field measurements are presented and discussed.

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