Method and apparatus for distinguishing narrowband continuous wave signals from broadband and impulsive signals
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United States of America Patent
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Nov 12, 1991
Grant Date -
N/A
app pub date -
Apr 28, 1989
filing date -
Apr 28, 1989
priority date (Note) -
Expired
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Abstract
Received signals preferably have a stable frequency spectrum over a frequency span derived from a resolution bandpass filter. Furthermore, the frequency span has a plurality of discrete frequency measurements across the frequency span. It is desired to determine which of the discrete frequencies correspond to peaks in the frequency spectrum. Each peak is integrated to initially determine which of the peaks are from narrowband continuous wave signals by comparing the aspect ratio of the peaks with the aspect ratio of a resolution bandpass filter. Those peaks which fail the aspect ratio test are discarded from the frequency spectrum. The remaining peaks are then fitted to a second order polynomial curve to finally determine whether they are due to narrowband continuous wave signals. The peaks which do not fit the curve are labeled as broadband.
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