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Fast Phased Array Calibration Method Based on Multiple Measuring Probes

This paper presents a fast phased array calibration method which significantly reduces the number of antenna under test (AUT) amplitude and phase setting states. Multiple measuring probes are introduced to record transmission coefficients as AUT works at different states. A coefficient matrix with a small condition number is constructed to calculate the initial excitation coefficients of each antenna element. Simulation results show that the coefficient matrix condition number can be reduced to 1 by optimizing the geometry of the measurement system. When the signal-to-noise ratio is higher than 18dB, the amplitude error of the calibration result is less than 0.5dB and the phase error is less than 20 degrees in the optimal conditional number configuration. This method effectively reduces the measurement time for the phased array calibration and improves the stability of the calibration system.