| 摘要 |
PURPOSE:To improve detection accuracy and reduce the size of a device by storing the reception level of a nondirectional antenna in a horizontal plane, switching and storing the reception levels of plural directional antennas in the horizontal plane on the basis of stored information, and operating an arrival azimuth. CONSTITUTION:An arrival radio wave is received through an antenna 1A and a receiver 3a and the pulse reception interval time of the arrival radio wave is detected and transmitted to an instruction device 7. The instruction device 7 operates switches (S)2 and 4 according to the pulse reception interval time to store reception levels corresponding to antennas 1a-1n in storage circuits 5a- 5h. The instruction device 7 selects antennas which receives the maximum reception level and the 2nd reception level by an operator 8 and the reception levels of the antennas selected by operating the S2 and S4 are stored. Meanwhile, the antenna 1A receives always the arrival radio wave, and stores reception level in the storage circuit 5A. The operator 8 operates accurately the azimuth of the arrival radio wave from the stored values of the selected reception levels and the stored value of the circuit 5A and the device is reduced in size. |
