Continuous wave radar altimeter

Details Continuous wave radar altimeter Continuous wave radar altimeter

1988-05-20

1998-07-14

Sotomayor, John B.

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

Determining distance

Altimeter

342122, G01S 1326

Patent

active

057811482

ABSTRACT:
A continuous wave radar altimeter comprises a memory (24, 26), means for storing in the memory in digital form an array of return signals representative of the variation of reflected amplitude with path length, means (27), for addressing the memory for identifying a peak return representative of the highest objects on the terrain, means (28) responsive to the array for determining the signal-to-noise ratio thereof, and means (29) responsive to the height at which the said peak return occurs and to the signal-to-noise ratio to determine a "center of area" height representative of the lowest surface on the terrain. The altimeter thus provides not only the peak level, representing for example the tops of trees and buildings, but also the ground level.

REFERENCES:
patent: 2930035 (1960-03-01), Altekruse
patent: 3141161 (1964-07-01), King
patent: 3210760 (1965-10-01), Olson et al.
patent: 3327306 (1967-06-01), Ellert et al.
patent: 3328795 (1967-06-01), Hallmark
patent: 3706988 (1972-12-01), Bayle et al.
patent: 4016565 (1977-04-01), Walker
patent: 4144571 (1979-03-01), Webber
patent: 4695013 (1987-09-01), Trampnau
patent: 4698635 (1987-10-01), Hilton et al.

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