Self-contained method for correction of an inertial system over

Details Self-contained method for correction of an inertial system over Self-contained method for correction of an inertial system over

1992-12-07

1994-09-06

Barron, Jr., Gilberto

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

Return signal controls external device

Aircraft guidance

342120, 364454, 364457, G01C 2108, G06G 778

Patent

active

053452410

ABSTRACT:
A method and apparatus for performing on-board corrections to the computed navigation variables of an inertial system on an aircraft while flying over a body of water. Onboard instruments, including a barometric altimeter and a radar altimeter, measure the vertical distance of the aircraft above an ellipsoidal model of the earth and above the body of water respectively. An on-board computer calculates the differences between such heights over a plurality of points along the path the aircraft travels over the water as indicated by its inertial navigation system. The differences are compared with a map of the undulation of the geoid encompassing the region to determine the deviation of the navigated course from the true course. Appropriate corrections to the aircraft's inertial system may then be made to reduce error.

REFERENCES:
patent: 4175285 (1979-11-01), Dansac et al.
patent: 5272639 (1993-12-01), McGuffin

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