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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 969712, 10 pages
http://dx.doi.org/10.1155/2012/969712
Research Article

Near-Ground Path Loss Measurements and Modeling for Wireless Sensor Networks at 2.4 GHz

1National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China
2Key Laboratory of Instrumentation Science and Dynamic Measurement of The Ministry of Education, North University of China, Taiyuan 030051, China
3North Automatic Control Technology Institute, CNGC, Taiyuan 030006, China

Received 25 March 2012; Revised 18 June 2012; Accepted 29 June 2012

Academic Editor: George P. Efthymoglou

Copyright © 2012 Daihua Wang 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.

Abstract

Near-ground channel characterization is an important issue in most military applications of wireless sensor networks. However, the channel at the ground level lacks characterization. In this paper, we present a path loss model for three near-ground scenarios. The path loss values for each scenario were captured through extensive measurements, and then a least-square linear regression was performed. This indicates that the log-distance-based model is still suitable for path loss modeling in near-ground scenarios, and the prediction accuracy of the two-slope model is superior to that of the one-slope model. The validity of the proposed model was further verified by comparisons between the predicted and measured far-field path losses. Finally, compared to the generic models, the proposed model is more effective for the path loss prediction in near-ground scenarios.