Subscription GPS information service system
US7020555B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2003 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Aug 1, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/009
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A GPS information service system for providing supplemental GPS correction and signal acquisition information to subscribers. A GPS information server broadcasts GPS aiding information encrypted with subscription keys. A remote GPS subscription unit receives the key enablers for the subscription keys in service activation (SAM) messages for the services for which they have subscribed and then uses the subscription keys to decrypt the GPS aiding information. In order to prevent unauthorized access to the information, unsymmetrical signature generation and authentication algorithms are used for generating and authenticating signatures for the SAM messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.