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Open AccessArticle

The Constant Information Radar

by Bryan Paul 1,2,*,† and Daniel W. Bliss 1,†
1
Bliss Laboratory of Information, Signals, and Systems and the Center for Wireless Information Systems and Computational Architectures (WISCA), Arizona State University, Tempe, AZ 85287, USA
2
General Dynamics Mission Systems, Scottsdale, AZ 85257, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Murat Akcakaya, Arye Nehorai and Satyabrata Sen
Entropy 2016, 18(9), 338; https://doi.org/10.3390/e18090338
Received: 12 August 2016 / Revised: 9 September 2016 / Accepted: 14 September 2016 / Published: 19 September 2016
(This article belongs to the Special Issue Radar and Information Theory)
The constant information radar, or CIR, is a tracking radar that modulates target revisit time by maintaining a fixed mutual information measure. For highly dynamic targets that deviate significantly from the path predicted by the tracking motion model, the CIR adjusts by illuminating the target more frequently than it would for well-modeled targets. If SNR is low, the radar delays revisit to the target until the state entropy overcomes noise uncertainty. As a result, we show that the information measure is highly dependent on target entropy and target measurement covariance. A constant information measure maintains a fixed spectral efficiency to support the RF convergence of radar and communications. The result is a radar implementing a novel target scheduling algorithm based on information instead of heuristic or ad hoc methods. The CIR mathematically ensures that spectral use is justified. View Full-Text
Keywords: information; radar; communications; RF convergence; shared spectrum information; radar; communications; RF convergence; shared spectrum
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Paul, B.; Bliss, D.W. The Constant Information Radar. Entropy 2016, 18, 338.

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