| 摘要 |
PROBLEM TO BE SOLVED: To provide a multipath incoming direction measuring device capable of measuring even an incoming direction of a multipath wave that exceeds GI (guard interval) in an OFDM signal without having to rotate a directional antenna. SOLUTION: The multipath incoming direction measuring device respectively performs frequency conversion of signals from receiving antennas of two systems by using synchronized local oscillators, respectively converts them into digital signals by using synchronized sampling clocks to respectively sampling them, converts them into complex equivalent baseband signals by respectively orthogonally demodulating them, performs timing correction of the sampling clocks to equalize disturbance of frequency characteristics respectively affected by multipath waves, respectively converts them into complex delay profiles showing incoming time difference to main waves and respectively calculates a phase in each delay time on the basis of the delay profiles. The two systems calculate a phase difference between receiving antennas and calculates a difference in an incoming angle of the multipath wave on the basis of the phase difference. COPYRIGHT: (C)2009,JPO&INPIT
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