Microwave landing system

Details Microwave landing system Microwave landing system

1987-12-08

1990-04-10

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Aircraft landing system

Microwave landing system

342173, G01S 740

Patent

active

049164511

ABSTRACT:
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.

REFERENCES:
patent: 4138678 (1979-02-01), Kirner
patent: 4145692 (1979-03-01), Armstrong et al.
patent: 4283725 (1981-08-01), Chisholm
patent: 4333081 (1982-06-01), Hofgen
patent: 4532517 (1985-07-01), LaBerge et al.
patent: 4590477 (1986-05-01), Regnier et al.
patent: 4639732 (1987-01-01), Acoraci et al.
patent: 4700192 (1987-10-01), Zezuto et al.
patent: 4724440 (1988-02-01), Lopez et al.

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