On-board orientation device for aircraft

Details On-board orientation device for aircraft On-board orientation device for aircraft

1981-11-09

1985-08-20

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7TA, G01S 1360

Patent

active

045367639

ABSTRACT:
A pulse radar device which can sweep in the azimuth direction with a two element direction finding antenna (1, 2) having a fan pattern and wherein the path differences and Doppler frequencies are ranged selective to determine at each azimuth from the echo signals received a mean aspect angle (.epsilon.) and the azimuth maximum Doppler frequency which can be calculated therefrom. The mean aspect angles (.epsilon.) are determined according to the values of the measured Doppler frequencies with the equation .epsilon.=arc cos (f.sub.d /f.sub.dmax.alpha.). In this angle determination, smaller aspect angles are determined according to the measurement of the range selective determined path differences. Subsequently, an image point vertical deflection which is proportional to the aspect angle is utilized for perspective terrain display. The invention can be employed with pulsed radar devices on-board aircraft L for terrain display and for obtaining navigation data.

REFERENCES:
patent: 3025517 (1962-03-01), Watson et al.
patent: 3060423 (1962-10-01), Goldan
patent: 3391339 (1968-07-01), Lynch
patent: 3701989 (1972-10-01), Calhoon, Sr. et al.
patent: 3918055 (1975-11-01), Shimizu et al.
patent: 3961264 (1976-06-01), Hekimian et al.
patent: 4197535 (1980-04-01), Koethmann et al.

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