An Anti-radiation Missile Seeker's Multi-Objective DOA Estimation Algorithm Based on Uniform Circular Array Decoherent Solution

The performance of anti-radiation seeker played an important role in the modern missile detection tasks. However, in practice, the multi-path reflection, the active decoy jamming, the multiple coherent and relevant sources might decrease the anti-radiation seeker's precisely detection and estimation performance in terms of estimating the target's direction of arrival (DOA for short). The traditional algorithms based on subspace will experience space covariance matrix rank loss, which leads to a sharply reduction of the subspace method's DOA estimation precision, and even failure of the overall detection task. The existing decoherence algorithms generally use spatial smoothing method or the method of dimension reduction to solve the rank loss. It mainly includes spatial smoothing algorithm and matrix construction algorithm. However, the spatial smoothing algorithm performs at the cost of array aperture loss. And the decoherence algorithms are mainly proposed for linear array and cannot be directly applied to circular array. In addition, they are also suffering from relatively heavy computation burden. To overcome the above dilemmas, in this paper, we proposed a novel kind of anti-radiation missile seeker's uniform circular array decoherent solution for multi-objective DOA estimation. By using the virtual array translation decoherent solution, and combined with the classical multiple signal classification (MUSIC) algorithm, an improved MUSIC DOA estimation algorithm is developed. Comparison simulation results indicated that, the proposed algorithm can fast achieve multiple coherent source DOA estimation without loss of array aperture, which is able to achieve more accurate real-time tracking performance for the anti-radiation missiles seekers. It seems that, the proposed method has potential in terms of improving decoherent performance, and also seems to be able to accurately obtain the multiple target's DOA information.