Array Calibration Method in Super-resolution Direction Finding for Wideband Signals

Most super-resolution direction finding methods need to know the array manifold exactly, but there are usually various errors or perturbations in application, which directly lead to the performance degradation, and even failure. The paper proposed an array calibration method in super-resolution direction finding for wideband signals based on spatial domain sparse optimization when mutual coupling, gain/phase uncertainty, and sensor location errors exist simultaneously. First, the Fast Fourier Transformation (FFT) is employed to divide the wideband signals into several sub-bands; Then corresponding optimization functions are founded by the signals of every frequency; After that the error parameters are estimated by expectation maximization(EM) iteratively; Finally, the information of all frequencies is integrated to calibrate the array, consequently the actual directions of arrival (DOA) can be estimated.

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