Patent ID: 7205936
Filing Date: 2007-04-17
Classification: G01S,H01Q

Abstract:
1. A receiving apparatus in an adaptive array antenna system capable of real-time calibration, comprising: a calibration signal generator generating an RF CW (radio frequency continuous wave) signal to output it as a calibration signal; a calibration signal injector injecting the calibration signal output from the calibration signal generator into each of RF signals of a plurality of paths received through an array antenna; an array receiver down-converting the RF signals output from the calibration signal injector to demodulate them to digital signals; a calibration controller estimating a transfer function of the injected calibration signal from each of the output signals of the array receiver to calculate calibration coefficients for the plurality of paths, and outputting a signal for controlling calibration signal power of the calibration signal generated by the calibration signal generator, wherein the calibration controller controls the calibration signal power such that a calibration signal ratio (CSR, which is defined as a ratio of the calibration signal power to received RF signal power) is within an allowable range of a reference value; and an error corrector respectively correcting errors in the RF signals from the baseband output of the array receiver, using the calibration coefficients output from the calibration controller and outputting the corrected signal to beam former to form a receive beam.