Methods and applications for altitude measurement and fusion of user context detection with elevation motion for personal navigation systems
US8566032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2009 |
| Grant date | Oct 22, 2013 |
| Priority date | — |
| Expiry date | Dec 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/49
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods and apparatuses for estimating a user's altitude with respect to the mean sea level are provided. According to some aspects, the present invention is able to estimate altitude in both open sky as well as in degraded GPS signal environments such as dense urban canyon environments where GPS performance is affected by fewer available satellites and/or multipath error. According to other aspects, the present invention uses data from a pressure sensor to estimate altitude, either with or without the use of GPS aiding data. According to further aspects, estimated altitude is integrated with other types of dead reckoning data to provide user context detection pertaining to changes of altitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.