04584646 is referenced by 32 patents and cites 6 patents.

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.

Title
System for correlation and recognition of terrain elevation
Application Number
6/509052
Publication Number
4584646
Application Date
June 29, 1983
Publication Date
April 22, 1986
Inventor
Franklin B Snyder
Palm Bay
FL, US
Luen C Chan
Indian Harbor Beach
FL, US
Agent
Antonelli Terry & Wands
Assignee
Harris Corporation
FL, US
IPC
G06F 15/50
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