Novel method of ordinal bearing estimation for more sources based on oblique projector |
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Authors: | Sun Wei Bai Jianlin Wang Kai |
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Affiliation: | 1. Missile Inst., Air Force Engineering Univ., Sanyuan 713800, P. R. China;Aviation Equipment Academy, Beijing 100085, P. R. China 2. Missile Inst., Air Force Engineering Univ., Sanyuan 713800, P. R. China |
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Abstract: | A novel direction of arrival (DOA) estimation method is proposed when uncorrelated, correlated, and coherent sources coexist under color noise field. The uncorrelated and correlated sources are firstly estimated using the conventional spatial spectrum estimation method, then the noise and uncorrelated sources in Toeplitz structure are eliminated using differencing, finally by exploiting the property of oblique projection, the contributions of correlated sources are then eliminated from the covariance matrix and only the coherent sources remain. So the coherent sources can be estimated by the technique of modified spatial smoothing. The number of sources resolved by this approach can exceed the number of array elements without repeatedly estimating correlated sources. Simulation results demonstrate the effectiveness and efficiency of our proposed method. |
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Keywords: | spatial differencing oblique projector Toeplitz property direction of arrival estimation |
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