Patent ID: 6917786
Filing Date: 2005-07-12
Classification: H01Q,H04B

Abstract:
1. A radio receiving apparatus including an array antenna constituted by a plurality of antennas, a plurality of array radio receiving means provided in correspondence to the individual antennas, array signal processing means for weighting the outputs of the individual array radio receiving means in accordance with a predetermined algorithm, synthesizing the weighted outputs, and then outputting the synthesized output, and detecting means for calculating the correction amounts of an amplitude fluctuation and a phase shift of each array radio receiving means on the basis of the output of each array radio receiving means, the correction amounts being obtained by using a calibration signal which is a known signal, the radio receiving apparatus comprising: calibration signal switching means each of which is connected between the individual antennas and the array radio receiving means associated with the individual antennas, receives a reception output of the individual antennas and the calibration signal, and selects either the reception output of the individual antennas or the calibration signal and outputs the selected one to the array radio receiving means; diversity receiving means that receives the reception outputs of the plurality of antennas, carries out diversity processing, and outputs the results; demodulation signal switching means that receives an output of the array signal processing means and an output of the diversity receiving means and provides either the output of the array signal processing means or the output of the diversity receiving means; diversity reception quality monitoring means for monitoring the reception quality of diversity reception performed by the diversity receiving means; array reception quality monitoring means for monitoring the reception quality of array antenna reception performed by the array radio receiving means and the array signal processing means; and receiving system deciding means that instructs the demodulation signal switching means to select the output of the diversity receiving means and instructs the calibration signal switching means to select the calibration signal if the reception quality of the diversity reception is equivalent to the reception quality of the array antenna reception.