Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-07-24
1984-01-31
Cangialosi, Sal
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 16LS, G01S 116
Patent
active
044293127
ABSTRACT:
An independent landing monitoring system (ILM) for guiding airborne vehicles on final approach to a landing using a ground-based beacon which transmits a sequence of pulse signals including an omnidirectional signal coded to identify its location and used for initial approach, followed by time spaced directionally radiated right/left and up/down signals used for precision guidance along the final approach path. The time spacing of the various beacon signals and their order of succession in the sequence identify the signals, and the relative intensities of paired precision guidance signals as received by the aircraft is used to provide precision indications of the location of the aircraft on the path. The beacon can be either triggered by the weather radar in the aircraft which then receives the beacon signals on its beacon mode receiver, and/or it can be triggered randomly by a noise jittered oscillator in the beacon for use by approaching aircraft equipped only with a beacon receiver but no weather radar.
REFERENCES:
patent: 3274592 (1966-09-01), Crane
patent: 3945006 (1976-03-01), Cleeton
patent: 4103300 (1978-05-01), Gendreu et al.
Cangialosi Sal
Gordon M. R.
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