Terrain referenced navigation-adaptive filter distribution

Details Terrain referenced navigation-adaptive filter distribution Terrain referenced navigation-adaptive filter distribution

1992-01-16

1994-07-19

Black, Thomas G.

Boots, shoes, and leggings

364572, 342 63, G06F 1550

Patent

active

053315626

ABSTRACT:
A terrain referenced navigation system utilizing a five-state kalman filter with a filter distribution based on a fixed grid approach. The five-state kalman filter utilizes an aircraft's altitude, East velocity, East acceleration, a South velocity and South acceleration. The database of the terrain referenced navigation system also utilizes a state variable indicating whether the aircraft is headed over water or land. The accuracy of the terrain referenced navigation system is improved by ignoring filter coefficients over water. The invention provides increased computational efficiency and accuracy by predicting inertial navigation parameters in the line of flight of an aircraft within a circle error of probability at predetermined filter locations within the circle error of probability. The difference between actual and predicted values are then used to compute a new estimate. The method is repeated until the removal of the most divergent filter at each pass results in a single best filter.

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