Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2006-04-25
2006-04-25
Ha, Dac V. (Department: 2634)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S256000, C455S150100, C455S154200
Reexamination Certificate
active
07035311
ABSTRACT:
A signal intercept and analysis processor for a wideband intercept receiver system including at least one wideband receiver has a signal detector operatively connectable to the wideband receiver and a signal extractor operatively connected to the signal detector and connectable to the wideband receiver for performing signal extraction directly on a wideband signal output of the receiver and for performing the signal extraction only upon detection of a signal by the signal detector. The signal detector includes a generator of a coarsely sampled or decimated time-frequency representation of the wideband signal output. The time-frequency representation is decimated or coarsely sampled in time compared to an inverse frequency filter bandwidth used in the time-frequency representation. The generator preferably includes a digital filter bank. The digital filter bank in turn may include means for performing a sequence of windowed FFTs on samples of the wideband signal output, wherein a stride between consecutive one of the FFTs is considerably larger than a length of each of the FFTs.
REFERENCES:
patent: 5412690 (1995-05-01), Kotzin et al.
patent: 6570910 (2003-05-01), Bottomley et al.
Jones Graeme
Nohara Tim J.
Premji Al
Weber Peter
Coleman Henry D.
Ha Dac V.
Sapone William J.
Sicom Systems, Ltd.
Sudol R. Neil
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