Patent · US Expired

System for correlation and recognition of terrain elevation

US4584646A · kind A · utility

35Cited by
5References
8Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 29, 1983
Grant dateApr 22, 1986
Priority date—
Expiry dateJun 29, 2003

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01C21/005
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.