CALIBRATION DEVICE

摘要

A calibration device includes reference signal normalizing units 5-1 to 5-M that set, as a reference signal, a frequency domain signal being associated with either one 2 of reception antennas and being included in frequency domain signals obtained by conversions made by Fourier transform units 4-1 to 4-M, and divide the frequency domain signals after the conversion made by the Fourier transform units 4-1 to 4-M by the reference signal, thereby normalizing the frequency domain signals, and reference frequency normalizing units 6-1 to 6-M that normalize the frequency domain signals normalized by the reference signal normalizing units 5-1 to 5-M by using a signal having a reference frequency included in the frequency domain signals.

主权项

1. A calibration device comprising:
an array antenna to receive an unknown signal whose direction of arrival is unknown; a signal converter to convert signals received by a plurality of element antennas which construct said array antenna, into frequency domain signals; a reference signal normalizer to set, as a reference signal, either a frequency domain signal being associated with either one of the element antennas and being selected from among said frequency domain signals obtained by the conversion made by said signal converter, or a frequency spectrum of said unknown signal acquired in advance, and to normalize said frequency domain signals by using said reference signal; a reference frequency normalizer to normalize the frequency domain signals normalized by said reference signal normalizer, by using a signal having a reference frequency which is included in the frequency domain signals normalized by said reference signal normalizer; a direction of arrival estimator to estimate the direction of arrival of said unknown signal by using the frequency domain signals normalized by said reference frequency normalizer; and an amplitude and phase error estimator to estimate amplitude errors and phase errors occurring in said plurality of antennas by using both the direction of arrival estimated by said direction of arrival estimator and the frequency domain signals normalized by said reference signal normalizer.