Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1992-05-19
1993-04-27
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342413, G01S 116, G01S 118
Patent
active
052066541
ABSTRACT:
A passive aircraft monitoring system (20) receives signals transmitted by an instrument landing system (14, 16) and reflected from aircraft (18). The Doppler shift in the reflected signals is used to calculate the position or velocity of the aircraft. Using the ILS 90 and 150 Hz signals reflected from the aircraft and comparing their magnitude, the altitude and lateral position of the aircraft can also be determined.
REFERENCES:
patent: 3704465 (1972-11-01), Masak et al.
patent: 4301455 (1981-11-01), Yetter
patent: 4951056 (1990-08-01), Cope et al.
Finkelstein Marc
Geesaman Martin J.
Lynch Thomas J.
Blum Theodore M.
Denson-Low Wanda
Hughes Aircraft Company
Lindeen III Gordon R.
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