Inertial navigation accuracy enhancement
US6912464B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1998 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Dec 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/1656
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for the improvement of inertial navigation system (INS) position/velocity comprises frame stores for storing sequential images from a video camera and a comparator for comparing pixels in predicted images, derived from earlier stored images as modified by INS linear and angular velocity outputs, with pixels in actual later stored images, to derive a velocity error correction signal which is used to correct the INS output. The video processing correction system described is passive and hence does not reveal the aircraft's whereabouts as would be the case with other positional correction systems using radar, nor does it rely on systems outside the control of the INS, e.g., GPS, nor is it reliant on a vast terrain feature database.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.