Patent ID: 6462704
Filing Date: 2002-10-08
Classification: G01S,H01Q

Abstract:
A method for an array antenna calibration comprising the steps ofproviding a sensor system presenting a sensor device at each antenna element, said sensor devices including digital receivers and each digital receiver producing a respective complex base-band I/Q-signal; providing present beam pointing angle signal phase off-set information and converting base band I/Q-signals into new complex signals corresponding to a broad-side beam direction; producing crosswise signal correlation values from acquired new complex signals by a digital processing device for filtering out time dependent portions of said complex signals; normalizing and adding achieved signal correlation values to arrive at a summed DC voltage that will present a maximum when all sensed antenna element signals corresponding to a broad-side direction are in phase; adjusting signal phase of each antenna element source signal by a device for controlling signal phase in order to obtain maximum summed DC voltage achieved from the sensor system base band signals.