Journal
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
Volume 11, Issue 7, Pages 2362-2375Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSTARS.2018.2835448
Keywords
Alternating projection (AP); direction-of-arrival (DOA) estimation; multipath propagation; subspace based; very high-frequency (VHF) radar
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Funding
- National Science Fund for Distinguished Young Scholars [61525105]
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Invery high-frequency (VHF) radar, the performance of low-angle target tracking is strongly affected by multipath phenomenon, especially in the case of complex terrain where exact information of reflection paths is unknown. To deal with this problem, a practical multipath signal model for VHF radar in complex terrain is presented, where both curved earth geometry and actual ground surface reflection coefficient are considered. Then, a novel altitude estimation technique based on alternating projection is proposed, where the motion or Doppler shift of a target is neglected during the observation time of one coherent processing interval. The technique applies to vertical antenna arrays which perform an interferometric estimation of the target elevation angle. Simulation results and real data analysis show that the target tracking accuracy can be efficiently improved by using the proposed algorithm under both simple and complex multipath scenarios.
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