Research on DOA technique of non-ideal array based on rotating projectile
[Objective]This paper proposes an online calibration direction-of-arrival(DOA)estimation al-gorithm to solve the problem of error interference by strong clutter in the flight of a rotating missile direction-finding system.[Method]Using the prior condition of the known array-rotation angles,the maximum likeli-hood criterion-based method is used to estimate the conformal array errors and spatial-polarization parameters of the signal.[Results]The simulation experiment results show that the proposed algorithm can achieve on-line error calibration and signal parameter estimation for arrays with directione-dependent amplitude-phase in-consistency errors.Moreover,the estimation performance of the algorithm is related to the rotation times of the array platform and signal-noise ratio(SNR)ratio.When the number of rotations exceeds twenty-four,the es-timation error of the spatial domain parameters is less than one degree under the condition of low SNR(10 dB).[Conclusion]The proposed algorithm uses the idea of fractal dimension alternating processing to solve the multi-parameter estimation problem,enabling it to ensure the convergence of parameters and greatly reduce computational complexity.
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