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Journal of Applied Mathematics
Volume 2014, Article ID 424191, 14 pages
http://dx.doi.org/10.1155/2014/424191
Research Article

Estimating Target Heights Based on the Earth Curvature Model and Micromultipath Effect in Skywave OTH Radar

School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China

Received 23 April 2014; Accepted 19 June 2014; Published 14 July 2014

Academic Editor: Weichao Sun

Copyright © 2014 Hou Chengyu 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

Skywave over-the-horizon (OTH) radar systems have important long-range strategic warning values. They exploit skywave propagation reflection of high frequency signals from the ionosphere, which provides the ultra-long-range surveillance capabilities to detect and track maneuvering targets. Current OTH radar systems are capable of localizing targets in range and azimuth but are unable to achieve reliable instantaneous altitude estimation. Most existing height measurement methods of skywave OTH radar systems have taken advantage of the micromultipath effect and been considered in the flat earth model. However, the flat earth model is not proper since large error is inevitable, when the detection range is over one thousand kilometers. In order to avoid the error caused by the flat earth model, in this paper, an earth curvature model is introduced into OTH radar altimetry methods. The simulation results show that application of the earth curvature model can effectively reduce the estimation error.