Method for reducing position uncertainty of a portable inertial navigation device
US6829558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jan 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A first set of coordinates (100) of a device and an estimated positional error (“EPE”) radius (102) is measured. An EPE circle (104) is derived, in which the device is approximately located, from the first set of coordinates (100) and the EPE radius (102). When it is determined that the EPE radius (102) exceeds a predetermined threshold, a first range (106) between the device and a ranging site (108) is measured, and a locus of points (110) on and within the EPE circle (104) is determined, wherein a distance between the ranging site (108) and each point in the locus of points (110) approximately equals the first range (106).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.