A Method for Generating Narrowband Test Signals

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Authors
  1. Maranda, B.H.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
One common method of testing a narrowband signal detector is to examine its performance when processing a simulated time series consisting of tones in additive noise, the amplitude of the tones being adjustable. The tones are usually implemented as pure sinusoids, but these do not adequately exercise the different analysis bandwidths available in the narrowband detector of a modern passive sonar. A method is described herein for generating a narrowband test signal with controllable bandwidth, achieved by passing white noise through a digital filter. By replicating the filter, a simulated time series can be built to contain multiple tone-like signals of different bandwidths and levels. The digital fiter was designed and implemented using a frequency-sampling structure, which allowed a very narrow filter to be realized as a delay memory followed by a small number of second-order filter sections placed in parallel; the operation count is thus small despite the narrow filter width.

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Report Number
DRDC-ATLANTIC-TM-2002-193 — Technical Memorandum
Date of publication
01 Nov 2002
Number of Pages
41
DSTKIM No
CA022686
CANDIS No
519664
Format(s):
CD ROM

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