Overwater radar navigation system

Details Overwater radar navigation system Overwater radar navigation system

1980-09-15

1982-04-13

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 12R, 364454, G02S 1308

Patent

active

043250661

ABSTRACT:
A system is provided for correcting the assumed orientation of the horizontal plane of an inertial navigation system on an aircraft, while it is flying over the ocean. The range from the aircraft to the ocean surface is measured along a boresight tilted at a small downward angle such as 6.degree. to 12.degree. from the horizontal, as by radar ranging, and the precise range and the precise tilt angle of the boresight with respect to the inertial or other horizontal is taken. The measured range is compared with an independently-derived range, and the difference is utilized to correct the assumed horizontal direction of the navigation system. The second range may be the range calculated on the basis of the downward tilt angle of the boresight from the assumed horizontal direction in the inertial navigation system, and the difference between the real and calculated ranges can be utilized to determine the error in the assumed horizontal direction of the inertial system.

REFERENCES:
patent: 3028592 (1962-04-01), Parr et al.
patent: 3184736 (1965-05-01), Badewitz
patent: 3337867 (1967-08-01), Badewitz
patent: 3670334 (1972-06-01), Gaheen, Jr.
patent: 4085440 (1978-04-01), Hose
patent: 4168524 (1979-09-01), Soltz et al.

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