| 摘要 |
Field monitor antenna is located to receive reciprocally scanned guidance beams. A pair of test pulses having a time interval which is determined by the field monitor antenna location are generated from a test pulse generator during a dead time period of the guidance beam scanning. TO-pulse and FRO-pulse pulses in response to the guidance beams and those of the pair test pulses are supplied to a monitor. The monitor measures a first and a second time interval between the TO-pulse and the FRO-pulse of the signals from the test pulse generator and from the field monitor antenna. Monitor verification means verifies the normalcy of the monitor on the basis of the measured first time interval and verifies the normalcy of the guidance beam on the basis of the measured second time interval.
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