A COMPARISON OF DIRECTION FINDING RESULTS FROM AN FFT PEAK IDENTIFICATION TECHNIQUE WITH THOSE FROM THE MUSIC ALGORITHM

Authors
  1. Montbriand, L.E.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
A peak identification technique which uses the FFT algorithm is presented from unambiguously identifying up to three sources in signals received by the sampled aperture receiving array (SARA) of the Communications Research Centre. The technique involves removing phase rotations resulting from the FFT and the data configuration and interpreting this result as the direction cosine distribution of the received signal. The locations and amplitudes of all peaks for one array arm are matched with those in a master list for a single source in order to identify actual sources. The identification of actual sources was found to be subject to the limitations of the FFT in that there was an inherent bias for the secondary and tertiary sources to appear at the side-lobe positions of the strongest source. There appears to be a limit in the ratio of the magnitude of a weaker source to that of the strongest source, below which it becomes too difficult to reliably identify true sources. TRUNCATED
Report Number
CRC-1438 —
Date of publication
15 Jul 1991
Number of Pages
51
DSTKIM No
92-00529
CANDIS No
103426
Format(s):
Hardcopy;Originator's fiche received by DSIS

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