Tracking filter for radio altimeter

Details Tracking filter for radio altimeter Tracking filter for radio altimeter

1981-09-28

1984-01-24

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7A, G01S 904

Patent

active

044279817

ABSTRACT:
A filter for tracking the ground signal return in an FM/CW radio altimeter. The filter has a variable band pass frequency response which is adjusted as a function of the altitude measured by the altimeter. The control means of the filter respond to altitude measurements in digital format.

REFERENCES:
patent: 3065465 (1962-11-01), Wimberly
patent: 3334344 (1967-08-01), Colby
patent: 3344423 (1967-09-01), Thue
patent: 3761946 (1973-09-01), Johannesson et al.
patent: 3789398 (1974-01-01), Erst
patent: 4107681 (1978-08-01), Robertson et al.
patent: 4122529 (1978-10-01), Hoech
Reference Data for Radio Engineers, Howard W. Sam & Co. Inc., ITT, p. 16-4, (1982).
Post-Mixing Phase-Modulated FM-CW Radar Altimeter; Katano; IECE, Japan, vol. E61, No. 7, (Jul. 1978).

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