Radar altimeter static accuracy circuit

Details Radar altimeter static accuracy circuit Radar altimeter static accuracy circuit

1986-03-03

1987-12-22

Tubbesing, T. H.

Communications: directive radio wave systems and devices (e.g.,

Testing or calibrating of radar system

By monitoring

342122, G01S 740

Patent

active

047149280

ABSTRACT:
A Radar Altimeter static accuracy circuit which provides improved system accuracy when the altimeter platform is stationary over the ground. Most often this stationary condition occurs in helicopters while hovering at low altitudes but also occurs, for example, in altimeters used to measure the level of grain in elevators. The altimeters output, a voltage proportional to altitude, is used to control a voltage controlled oscillator (VCO), the output of which is summed into the receiver intermediate frequency (IF) amplifier output to fill in the return signal fades. These fades otherwise cause altitude processor errors leading to erroneous altitude measurements. The VCO is adjusted to produce an output frequency equal to the IF amplifier output frequency.

REFERENCES:
patent: 3344423 (1967-09-01), Thue
patent: 4176353 (1979-11-01), Pearson

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