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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 147368, 12 pages
http://dx.doi.org/10.1155/2015/147368
Research Article

Target Detection in Low Grazing Angle with Adaptive OFDM Radar

ATR Key Laboratory, National University of Defense Technology, Changsha, Hunan 410073, China

Received 10 June 2015; Revised 31 August 2015; Accepted 7 October 2015

Academic Editor: Kyeong Jin Kim

Copyright © 2015 Yang Xia 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

Multipath effect is the main factor of deteriorating target detection performance in low grazing angle scenario, which results from reflections on the ground/sea surface. Amplitudes of the received signals fluctuate acutely due to the random phase variations of reflected signals along different paths; thereby the performances of target detection and tracking are heavily influenced. This paper deals with target detection in low grazing angle scenario with orthogonal frequency division multiplexing (OFDM) radar. Realistic physical and statistical effects are incorporated into the multipath propagation model. By taking advantage of multipath propagation that provides spatial diversity of radar system and frequency diversity of OFDM waveform, we derive a detection method based on generalized likelihood ratio test (GLRT). Then, we propose an algorithm to optimally design the transmitted subcarrier weights to improve the detection performance. Simulation results show that the detection performance can be improved due to the multipath effect and adaptive OFDM waveform design.