Performance Characteristics and Metrics for Intra-Pulse Radar-Embedded Communication

Low probability of intercept (LPI) communication generally relies on the presence of noise to obfuscate a covert signal through the use of spectral spreading or hopping. In contrast, this paper addresses the use of ambient interference from other man-made emissions as a means to mask the presence of...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2011-12, Vol.29 (10), p.2057-2066
Main Authors: Blunt, S. D., Metcalf, J. G., Biggs, C. R., Perrins, E.
Format: Article
Language:English
Subjects:
detectors
Exploitation
Focusing
Intercept receivers
interference cancellation
Lighting
Military communication
Noise measurement
Parametrization
Radar
radar clutter
Radar scattering
Radar systems
Receivers
RFID tags
Spectra
spread spectrum communication
Symbols
transponders
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Summary:Low probability of intercept (LPI) communication generally relies on the presence of noise to obfuscate a covert signal through the use of spectral spreading or hopping. In contrast, this paper addresses the use of ambient interference from other man-made emissions as a means to mask the presence of covert communication. Specifically, the high power, wide bandwidth, and repeating structure of pulsed radar systems provide an advantageous framework within which to embed a communication signal. The operating paradigm considered here is that of an RF tag/transponder that is illuminated by the radar and intends to covertly communicate with the radar or some other desired receiver while being masked by the ambient radar backscatter to avoid detection by an intercept receiver. Communication takes place on an intra-pulse (or individual pulse) basis to maximize the data rate. The impact of multipath, and its exploitation using time reversal to achieve spatio-temporal focusing, is considered. The processing gain for the destination receiver and intercept receiver are derived analytically and subsequently used to optimize the parameterization of communication symbol design.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2011.111215