US Patent 11789118 Calibration of a phased array

An already deployed phased array can be calibrated in the near field without the need for an anechoic chamber or complex positioning mechanisms. Calibration includes positioning a transmitting antenna in the near field in front of the receiving antennas and generating range profiles while the transmitting antenna is positioned at various locations. The range profiles are utilized to produce various defined vectors that are then used in calculations that output a coupling calibration matrix and two vectors that compensate for receiver channel length and gain differences. The coupling calibration matrix and the vectors are input into the processing unit of the phased array in order to calibrate the receiving channels relative to each other.