Elevation map-referenced mechanism for updating vehicle navigati

Details Elevation map-referenced mechanism for updating vehicle navigati Elevation map-referenced mechanism for updating vehicle navigati

1988-04-04

1990-07-03

Chin, Gary

Boots, shoes, and leggings

364443, 364457, 342 64, G06F 1550

Patent

active

049396633

ABSTRACT:
A drift correction mechanism for a vehicle (e.g. aircraft) navigation system makes use of a digital map data base, in order to correct for errors in position estimates, so that the estimated flight path of the aircraft will more closely track its actual flight path, and thereby effectively compensate for the long term error to which the navigation system is subjected. During the flight, altimeter readings are periodically carried out in order to generate elevation values that are representative of the actual elevation of the terrain over which the aircraft is flying. These elevation values are then used as inputs to a digital map database, from which elevation profile contour lines of respective elevation values may be derived. At the time that a respective altimeter reading is effected, the position estimate output of the aircraft's navigation system is also sampled. This position estimate is then compared with the contour line that passes through the actual position of the aircraft at the time the altimeter measurement is made. The separation between the navigation system's position estimate and that geographical position on the contour line which is closest to the position estimate is then used as a correction factor to update the position estimate to a set of corrected geographical coordinates that more closely approximate the coordinates of the actual flight path of the aircraft.

REFERENCES:
patent: 4144571 (1979-03-01), Webber
patent: 4179693 (1979-12-01), Evans et al.
patent: 4495580 (1985-01-01), Keearns
patent: 4514733 (1985-04-01), Schmidtlein et al.
patent: 4520445 (1985-05-01), Keearns
patent: 4584646 (1986-04-01), Chan et al.

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