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

1983-06-29

1986-04-22

Chin, Gary

Boots, shoes, and leggings

364443, 364728, 343 5MM, 343 7TA, G06F 1550

Patent

active

045846464

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.

REFERENCES:
patent: 4144571 (1979-03-01), Webber
patent: 4179693 (1979-12-01), Evans et al.
patent: 4224669 (1980-09-01), Brame
patent: 4471357 (1984-09-01), Wu et al.
patent: 4495580 (1985-01-01), Keearns

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