Means for eliminating step error in FM/CW radio altimeters

Details Means for eliminating step error in FM/CW radio altimeters Means for eliminating step error in FM/CW radio altimeters

1981-08-10

1984-03-06

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 14, G01S 904

Patent

active

044357087

ABSTRACT:
A radio altimeter of the FM/CW type which is linearly frequency modulated by a triangular wave exhibits step error in the output indication at times near the peaks of the modulating wave. Step error is eliminated by gating the data which is processed to produce the altimeter output indication to inhibit processing during times the modulation wave is near peak values and to enable processing at other times. Accuracy is further improved by adjusting the duration of the time during which data processing is enabled so as to equal an integral number of cycles of processed data.

REFERENCES:
patent: 2928085 (1960-03-01), Katz
patent: 3341849 (1967-09-01), Cordry et al.
patent: 4146890 (1979-03-01), Klensch
patent: 4291309 (1981-09-01), Spiller et al.

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