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| A New DOA Estimator Based on Alternating Projection and Its Application in VHF Radar |
| Zhao Guang-hui; Chen Bai-xiao; Dong Mei |
| National Key Lab for Radar Signal Processing , Xidian Univ., Xi’an 710071, China |
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Abstract In the presence of multi-path propagation, it is quite difficult for VHF radar to measure the altitude of a low elevation target. In this paper, a new alternating projection algorithm is proposed to estimate the DOA of the target. By projecting the correlation matrix of the target echo into different signal subspaces, this method can be used to estimate accurately the directions of both the direct wave and the reflected wave, and hence the altitude of the target is known precisely. Results of both computer simulation and the real data from some VHF radar demonstrate the validity of the new algorithm. The Monte-Carlo experiment proves that the performance of the new algorithm is better than that of the temporal-spatial sequential ML algorithm.
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Received: 13 June 2006
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2008, Vol. 30 
