Communication navigation system, information server unit and communication terminal unit for the same, and method and program for communication navigation
US6807479B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2002 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Sep 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To provide a navigation system capable of easily switching between a portable terminal unit and a communication navigation terminal unit with an identical telephone number and also having considered a communication environment. A communication navigation system is comprised of an information server unit for controlling communication, a portable terminal unit and a vehicle terminal unit for performing navigation with the information server unit, and performs the communication by using a public switched telephone network circuit, and when switching each terminal unit to a communication capable state, it controls a position registration of each terminal unit by performing the communication among the information server unit, portable terminal unit and vehicle terminal unit so as to switch the communication capable state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.