| 摘要 |
PURPOSE:To perform radio detection on Doppler basis and direction detection with a good S/N ratio even when an antenna group is arranged at irregular intervals owing to the restrictions of a building by obtaining a receive signal with switching pulses in time series which are proportional to intervals of antenna arrangement. CONSTITUTION:A switching means 2 circulates and switches antenna outputs successively with pulses in time series which are proportional to irregular intervals of antenna means A1-An arranged on a circumference at the irregular intervals to obtain a receive signal. A phase shift detecting means 4 detects a phase shift which is caused in the receive signal owing to switching to obtain a phase detection signal, and an azimuth detecting means 5 extracts the basic wave component of the phase shift detection signal to obtain an azimuth component signal with a period equal to the circulation period. Then, the arrival direction of the radio wave is measured with the azimuth component signal. |
