Detection of time-frequency codes using a spectrogram
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United States of America Patent
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Nov 17, 2009
Grant Date -
May 3, 2007
app pub date -
Oct 23, 2006
filing date -
Nov 3, 2005
priority date (Note) -
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Abstract
A frequency hopping pattern of a frequency hopping signal is detected by use of spectrogram-generating software in a digital storage oscilloscope. By using a spectrogram, a hopping pattern can be determined without having to demodulate the signal, recover the phase or frequency of the carrier, determine optimal sample timing, or determine system timing. A block of data that contains at least one repetition of the hopping pattern in analyzed with respect to known hopping patterns as well as with respect to the duration in time of the relevant symbols of that data.
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