| Citation: | XIN Canwei, HU Anyong, LIU Kai, et al. Real-time rapid initial phase calibration method of phased array in near field[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(12): 2496-2502. doi: 10.13700/j.bh.1001-5965.2018.0225(in Chinese)
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Phased array receiver can steer antenna beam direction electronically by changing the phase of the units. Initial phase calibration of phased array is the precondition of steering antenna beam direction. In this paper, a coherent phase-shift measurement method is presented based on phase-shift measurement method, which has high accuracy and high speed to obtain the initial calibration phase of the phased array recei-ver, and then rotating electric vector (REV) method is used to further increase calibration accuracy. By using the measuring method presented in this paper, both the phased array receiver antenna and the probe are immovable, whose exact locations need not be determined in certain application. So, it is easy to be integrated into the monitoring system of the phased array receiver, which can realize real-time rapid initial phase calibration. The phase calibration method presented in this paper is verified on the Ka-band array radiometer, and the results show that the phase accuracy is 5°±1.5°, and the time consumption for finishing 256 channels once initial phase calibration is about 2 min.
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