System for correlation and recognition of terrain elevation

Details System for correlation and recognition of terrain elevation System for correlation and recognition of terrain elevation

G - Physics

01

S

354/15, 343/84

G01S 1/04 (2006.01) G01C 21/00 (2006.01) G06G 7/70 (2006.01)

Patent

CA 1216918

ABSTRACT In a dead reckoning navigation system a correlation scheme that operates in the frequency domain (using a discrete cosine transform (DCT) function) is implemented separately from the navigation system to determine a two-dimensional position error estimate. In this separate processing system measured terrain data is correlated (in the frequency domain) with reference elevation stored in map format (as by way of a digital map generator (DMG)). The results of this correlation are then employed to enhance the independently operated dead reckoning navigation system so that an accurate determination of geographic position may be obtained.

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