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Abstract. Target detection is the front-end stage in any automatic target recognition system for synthetic aperture radar (SAR) imagery (SAR-ATR). The efficacy of the detector directly impacts the succeeding stages in the SAR-ATR processing chain. There are numerous methods reported in the literature for implementing the detector. We offer an umbrella under which the various research activities in the field are broadly probed and taxonomized. First, a taxonomy for the various detection methods is proposed. Second, the underlying assumptions for different implementation strategies are overviewed. Third, a tabular comparison between careful selections of representative examples is introduced. Finally, a novel discussion is presented, wherein the issues covered include suitability of SAR data models, understanding the multiplicative SAR data models, and two unique perspectives on constant false alarm rate (CFAR) detection: signal processing and pattern recognition. From a signal processing perspective, CFAR is shown to be a finite impulse response band-pass filter. From a statistical pattern recognition perspective, CFAR is shown to be a suboptimal one-class classifier: a Euclidean distance classifier and a quadratic discriminant with a missing term for one-parameter and two-parameter CFAR, respectively. We make a contribution toward enabling an objective design and implementation for target detection in SAR imagery. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

This paper explores the benefits of cooperative diversity for a linear arrangement of Wireless Sensor Network (WSN). Such arrangement is typical for instance in the case of pipeline monitoring. The focus in this work is restricted to the Amplify-and-Forward (AF) protocol at the relay sensor nodewhere a proper lightweight combining strategy is considered at the receiver. A linear 3-node arrangement of WSN network is considered in the simulation. Substantial gain was observable upon deploying our cooperative scheme. It is evident that the distance between sensor nodes plays a role in dictating the overall system performance. Though they both fall under the same paradigm, there can be a remarkable difference between a fully cooperative and a partially-cooperative relay node. This motivated us to introduce the reliability of cooperation for the relay sensor node, and study its impact on the system performance. Simulation results make it clear that the cooperation reliability of the relay node can excruciately impact the system performance. Proper measure needs to be taken to account for this vulnerability in the cooperative scheme.

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