Digital channelized receiver based on time-frequency analysis for signal interception

A digital channelized receiver is presented for the interception of a wide variety of signals of complex structure, including those with low probability of interception. The receiver is designed from the perspective of the time-frequency analysis. It uses an extended time-frequency representation ba...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems 2005-07, Vol.41 (3), p.879-898
Main Authors: Lopez-Risueno, G., Grajal, J., Sanz-Osorio, A.
Format: Article
Language:English
Subjects:
Aircraft components
Chirp modulation
Coders
Digital
Encoders
Fourier transforms
Frequency modulation
Frequency shift keying
Interception
Radar detection
Receivers
Signal analysis
Signal design
Signal processing
Simultaneous signals
Space technology
Time frequency analysis
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Summary:A digital channelized receiver is presented for the interception of a wide variety of signals of complex structure, including those with low probability of interception. The receiver is designed from the perspective of the time-frequency analysis. It uses an extended time-frequency representation based on the noncoherent integration of the short-time Fourier transform (STFT) on which the detection system and the encoder work. The encoder includes robust frequency estimation, automatic modulation recognition, and clustering, to handle broadband and simultaneous signals and to prevent out-of-channel detections (a typical phenomenon in channelized receivers). The receiver has been evaluated for a wide range of signals and shows a good performance in terms of detection, estimation, and processing of simultaneous signals. Signals collected from real-life systems and synthetic signals have been utilized.
ISSN:0018-9251
1557-9603
DOI:10.1109/TAES.2005.1541437