Method and apparatus for determining actual lateral deviation fr

Details Method and apparatus for determining actual lateral deviation fr Method and apparatus for determining actual lateral deviation fr

1990-01-18

1991-05-07

Orsino, Joseph A.

Communications: electrical

Aircraft alarm or indicating systems

Nonalarm flight indicator

244184, 340971, 342 33, 364434, G01C 2100

Patent

active

050140531

ABSTRACT:
A method of and apparatus for determining the actual lateral deviation from the centerline of a runway of an aircraft located outside the normal region covered by a glideslope beam is disclosed. The method comprises the steps of scaling a geometrically developed estimated lateral deviation value (Y.sub.estimate) with a compensation factor (K) and passing the result through a complementary filter. The complementary filter produces an estimated lateral deviation rate value (Y.sub.estimate) that is divided into the actual lateral deviation rate value (Y.sub.actual) produced by the inertial navigation system of the aircraft. The result of the division is the compensation factor (K) that is used to scale the geometrically developed estimated lateral deviation value. Preferably, the compensation factor is filtered by a first order lag filter prior to being used to scale the geometrically developed estimated lateral deviation value. The output of the complementary filter is the desired actual lateral deviation value (Y.sub.actual).

REFERENCES:
patent: 3136502 (1964-06-01), Auld, Jr. et al.
patent: 3417945 (1968-12-01), Reynolds et al.
patent: 3773281 (1973-11-01), Doniger et al.
patent: 3918662 (1975-11-01), Vircks et al.
patent: 4697768 (1987-10-01), Klein
patent: 4714929 (1987-12-01), Davidson

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