Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1978-08-22
1980-04-01
Britton, Howard W.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
340 25, 343108SM, H04B 900, G01S 118
Patent
active
041963466
ABSTRACT:
A laser guided blind landing system for aircraft comprising in combination: a longitudinally extending runway, a plurality of laser beam generators mounted in longitudinally spaced alignment therewith at one end thereof, said generators being positioned to direct laser beams therefrom at progressively increasing coplanar inclinations away from said runway in progressive sequence from the nearest to the furthest therefrom, thereby to produce intersecting segments of said beams in pairs of each, of least slope adjacent said runway and of greatest slope remotest therefrom, the so intersecting laser beam segments thereby forming a continuous laser aircraft glide path of gradually decreasing slope from said segment remotest from said runway to that closest thereto. Preferably all of the laser generators radiate laser beams of distinctively different wavelengths or are tone modulated at different frequencies, except for the runway approach beam which may be of wavelength in the visible spectra.
REFERENCES:
patent: 2539405 (1951-01-01), Deloraine
patent: 3523664 (1970-08-01), Doniger
patent: 3784968 (1974-01-01), Brosow
Britton Howard W.
McElhannon Raymond J.
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