Angle sensing system

Details Angle sensing system Angle sensing system

1978-08-17

1980-03-18

Gruber, Felix D.

Boots, shoes, and leggings

340 26, 343113R, 364559, G01S 336, G01P 1302

Patent

active

041942442

ABSTRACT:
A system for measuring, in conjunction with a GCA radar, the crab angle of n aircraft which is making its landing approach above a runway. A loop antenna mounted on the craft transmits an audio-frequency electromagnetic wave to two sets of crossed receiving loops, each set mounted at one side of the runway. A line joining the centers of the loops makes a 45.degree. angle with the plane of each loop. The outputs of the loops in each set are subtracted from each other, amplified, detected and rectified and then differentiated to provide a pulse output indicating the zero point of the subtraction, i.e., the time when the H-field vector is at an angle of 45.degree. to the plane of each of the loops in the set providing the zero-indicating pulse output. The zero-indicating pulse outputs are fed to a time interval counter which determines the time interval between them. With this information plus the ground speed of the craft (as determined by the GCA radar) and the distance between the receiving-loop sets, the crab angle of the aircraft can be calculated.

REFERENCES:
patent: 3355736 (1967-11-01), Perper
patent: 3490024 (1970-01-01), Sherrill et al.
patent: 3496565 (1970-02-01), Jenkins
patent: 3697997 (1972-10-01), Cooper
patent: 3795000 (1974-02-01), Bell et al.
patent: 3872477 (1975-03-01), King
patent: 3980948 (1976-09-01), Olive
patent: 4094073 (1978-06-01), Parra

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