| Citation: | Houhong XIANG, Baixiao CHEN, Ting YANG, Minglei YANG. Low-elevation DOA Estimation for VHF Radar Based on Multi-frame Phase Feature Enhancement[J]. Journal of Electronics & Information Technology, 2020, 42(7): 1581-1589. doi: 10.11999/JEIT190432
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For the DOA estimation problem of low-elevation target of VHF radar, a new multi-frame phase feature enhancement based method is proposed, which solves effectively the phase feature ambiguity of direct signal, and thus improves the accuracy of DOA estimation. By learning the complex mapping relationship between the phase distribution of the multi-frame data and ideal phase distribution of the direct signal, the fuzzy phase information is enhanced and is used to reconstruct a new data matrix with original amplitude information. The DOA is estimated by conventional methods using new data matrix, which effectively improves the DOA estimation accuracy of the low-elevation target. The effectiveness of proposed method is validated by computer simulation experiments and real data, and it shows higher accuracy compared with physics-driven methods including MUSIC method and state-of-the-art data-driven method including feature reversal and Support Vector Regression (SVR).
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