Radar and Sonar Sensor Networks
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Editorial Radar and Sonar Sensor Networks Qilian Liang (EURASIP Member),1 Xiuzhen Cheng,2 Scott. C.-H. Huang,3 Sherwood W. Samn,4 Lingming Wang,5 and Zheng Zhou6 1 Department
of Electrical Engineering, University of Texas at Arlington, Arlington, TX 76019-0016, USA of Computer Science, The George Washington University, Washington, DC 20052, USA 3 Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan 4 Air Force Research Laboratory/RHX, Brooks City Base, San Antonio, TX 78235, USA 5 Core Software Department, iBiquity Digital Corporation, 150 Allen Road, Suite 201, Basking Ridge, NJ 07920, USA 6 School of Information and Telecommunications, Beijing University of Posts and Telecommunications, Beijing 100876, China 2 Department
Correspondence should be addressed to Qilian Liang, [email protected] Received 23 September 2010; Accepted 23 September 2010 Copyright © 2010 Qilian Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Although radar and sonar rely on two fundamentally different types of wave transmission, Radio Detection and Ranging (RADAR) and Sound Navigation and Ranging (SONAR) both are remote sensing systems with important military, scientific, and commercial applications. RADAR sends out electromagnetic waves, while active SONAR transmits acoustic (i.e., sound) waves. In both systems, these waves return echoes from certain features or targets that allow the determination of important properties and attributes of the target (i.e., shape, size, speed, distance, etc.). Because electromagnetic waves are strongly attenuated (diminished) in water, RADAR signals are mostly used for ground or atmospheric observations. Because SONAR signals easily penetrate water, they are ideal for navigation and measurement under water. The networking of radars and networking of sonars are two emerging research areas, known as radar sensor networks and underwater sensor networks. This special issue contains eleven papers selected from submissions through open calls. These papers highlight some of the current research interests and achievements in the area of radar sensor network and underwater sensor networks. The topics include UWB radar sensor networks, MAC protocol design, network routing, target detection, propagation modeling, and interference mitigation. Q. Ren and X. Cheng’s paper presents a proposed MAC protocol that is latency-optimized and energy-efficient scheme and combines the physical layer and the MAC layer to shorten transmission delay. On physical layer, convolution coding and interleaver are used for transmitted information.
Moreover, dynamic code rate is exploited at the receiver side to accelerate data reception rate. On MAC layer, unfixed frame length scheme is applied to reduce transmission delay, and to ensure the data successful transmission rate at the same time. J. Liang et al.’s paper presents that
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