Groundspeed measurement system

Details Groundspeed measurement system Groundspeed measurement system

1979-10-17

1981-11-17

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343113DE, G01S 144

Patent

active

043014550

ABSTRACT:
A measurement system for determining the groundspeed of an aircraft during final approach and landing, by measuring at the aircraft the Doppler shift of a radio signal, and/or its modulation components, transmitted by a fixed ground station. The carrier signal is allowed to drift; it is provided with a modulated tone on the carrier having a frequency signature that identifies the direction and magnitude of this carrier frequency drift. In a second embodiment the Doppler cycles are not counted directly, but rather fixed increments of a cycle wavelength are measured; the time period of each segment is inverted to obtain a value proportional to the Doppler frequency.

REFERENCES:
patent: 3605095 (1971-09-01), Higgins
patent: 3787861 (1974-01-01), Becavin et al.
patent: 3893118 (1975-07-01), Overbury

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