Radar altimeter

Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter

Reexamination Certificate

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Details

C342S120000

Reexamination Certificate

active

06992614

ABSTRACT:
A radar altimeter is provided that includes a transmitter operable to generate a radio signal at a modulation frequency, and transmit the radio signal toward a ground surface for reflection therefrom to thereby propagate a reflected radio signal. The radar altimeter also includes a receiver operable to receive the reflected radio signal, and determine the altitude of the aircraft based on the modulation frequency of the radio signal and a difference frequency derived from the radio signal and the reflected radio signal. The receiver is also operable to control the transmitter so as to vary the modulation frequency of the radio signal based on the altitude of the aircraft. Preferably, the modulation frequency of the radio signal is greater at lower altitudes than at higher altitudes.

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Skolnik, Merrill I, Radar Handbook, pp. 16-28 to 16-32.
Technical Standard Order TSO-C87, Airborne Low-Range Radio Altimeter; pp. 1-41, Feb. 1, 1966, http://www.airweb.faa.gov/Regulatory—and—Guidance—Library/rgTSO.nsf/0/2C417369F3ACFDD886256DC70062A5C1?OpenDocument.
RTCA D0-155, Minimum Performance Standards Airborne Low-Range Altimeter, Nov. 1, 1974.

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