Patent ID: 11228104

Abstract:
A calibration device of an array antenna is for a transmission means including a plurality of antenna elements and transmission signal processing systems corresponding to the plurality of antenna elements, in which an antenna element transmission signal is calibrated for amplitude and phase differences and a time difference for each of the antenna elements on the basis of a transmission signal calibrating value, the transmission means being for generating a plurality of transmission radio waves applied with amplitude and phase differences and a time difference corresponding to each of the plurality of antenna elements and emitting the transmission radio waves from the respective antenna elements, the calibration device including: a multicarrier calibration signal generating means for generating a plurality of calibration signals based on, in correspondence, a plurality of subcarriers including a first frequency unit of a subcarrier to which a subcarrier symbol is assigned and a second frequency unit not assigned a subcarrier symbol, the plurality of calibration signals being different for each of the plurality of antenna elements; injection means for injecting a plurality of calibration signals generated by the multicarrier calibration signal generating means into the transmission means in one-to-one correspondence to the transmission signal processing systems of the plurality of antenna elements; extraction means for extracting calibration signals processed by the transmission signal processing systems of the plurality of antenna elements; a demultiplexing means for demultiplexing the calibration signals, for the respective antenna elements, extracted by the extraction means into a frequency unit of an assigned subcarrier and a frequency unit not assigned as a subcarrier; and a calibration processing means for obtaining a calibration value for calibrating the amplitude and phase differences and the time difference between the transmission signal processing systems of the plurality of antenna elements using the signals demultiplexed by the demultiplexing means, and providing the transmission signal calibrating value based on the obtained calibration value to the transmission means.