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| DOA Estimation of Ocean Currents Based on Multi-Stage Wiener Filter |
| An Zhi-juan①②; Su Hong-tao①; Bao Zheng① |
| ①Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China;②School of Science, Xidian University, Xi’an 710071, China |
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Abstract In this paper the Multi-Stage Wiener Filter (MSWF) is presented for the DOA estimation of ocean currents. For echoes scattered from ocean waves with the same velocity of flow and in the same range bin are partially correlated, first the spatial smoothing technique is applied to the measured data to remove the correlation of signal, then the signal subspace and noise subspace can be obtained by the recursive algorithm instead of the estimation and eigen-decomposition of covariance matrix, therefore the computation complexity can be reduced remarkably, which is necessary for the real time system. Finally by analyzing the measured data, it is shown that this method can detect the currents efficiently and effectively.
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Received: 08 May 2006
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2007, Vol. 29 
