Patent ID: 7145508

Claim:
A calibration method of a radio frequency signal receiving apparatus that includes a plurality of antennas, which antennas receive a radio frequency signal spread with a spread code, and a plurality of radio frequency signal receiving units, each being connected to a respective one of the antennas, comprising: a step of generating a calibration signal having a cycle different from a cycle of the spread code; a step of adding the calibration signal to the radio frequency signal received by each of the antennas, and providing the added signal to the respective radio frequency signal receiving units; a step of detecting a value of correlation between a first baseband signal output by a first radio frequency signal receiving unit, and a second baseband signal output by a second radio frequency signal receiving unit, the second baseband signal being delayed by a predetermined amount; and a step of compensating for a phase difference and/or an amplitude difference between the antennas produced by the radio frequency signal receiving units based on the value of correlation.