Patent · US Expired

Correcting a prior dead reckoning determined position measurement using GPS when GPS is later acquired

US6545638B2 · kind B2 · utility

55Cited by
4References
11Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 18, 2001
Grant dateApr 8, 2003
Priority date—
Expiry dateOct 18, 2021

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01S19/49
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Dead reckoning is used to solve a location problem when a user is out of range of GPS coverage. A starting position is determined by tracking movements from a first position where GPS coverage is not available to a second position where GPS coverage is available. The starting position is then determined by backtracking from this known position.

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