Helicopter navigation system

G - Physics – 01 – S

Patent

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343/81

G01S 5/02 (2006.01) G01S 3/52 (2006.01) H01Q 1/28 (2006.01)

Patent

CA 1043885

HELICOPTER NAVIGATION SYSTEM Abstract of the Disclosure A system for use in navigation of a helicopter. Antennae are carried at the free ends of each of the blades of the rotor of the helicopter. Radio waves transmitted by a beacon at a known location on the ground are received by the antennae and phase modulated by their rotation. On the rotor the signals are amplified and mixed with oscillations from local oscillators and detected while the reference signals from the local oscillators are mixed. By means of slip rings and contact brushes the signals are introduced into the body of the helicopter where they are first multiplied and then filtered so as to produce phase modulated signals with a nil carrier frequency which is supplied to an electroluminescent diode illuminating a rotating disc light modulator with a light transmitting function which is analogous to the phase modulation of the signals received by the antennae. The light beam passing through the disc is integrated in a vidicon and displayed on a screen.

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