An oversampling sonar receiver with digital filtering / James R. Parks.: Fs97-18/235-2004E-PDF

This document describes a sonar receiver that uses digital signal processing techniques to simplify analogue design and allow the receiver to be easily reconfigured for different operating frequencies. Signal processing techniques used include digital filtering, envelope generation using the Hilbert transform, and oversampling which permits the use of simple (low order) analogue filters and, as a secondary benefit, increases effective A/D conversion resolution. The receiver incorporates a low noise differential preamp, a second order passive bandpass filter, an 80 dB variable gain stage and a second order low pass antialias filter. A National Instruments data acquisition ( NIDAQ ) card installed in a personal computer provides the A/D and the control signal for the receiver gain. National Instruments LabWindows CVI ( “C” for Virtual Instruments ) is used as the software development tool to provide an intuitive virtual control panel on a PC monitor and the library of digital signal processing functions used in the project.

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