Communications: electrical – Vehicle position indication – Map display
Reexamination Certificate
1998-12-29
2001-05-22
Lee, Benjamin C. (Department: 2632)
Communications: electrical
Vehicle position indication
Map display
C340S988000, C455S425000, C455S524000, C455S404200, C455S433000, C701S208000
Reexamination Certificate
active
06236338
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication device which can be connected to a plurality of radio control apparatuses.
A conventional navigation system displays the current position on a map using as a medium a GPS (global positioning system) that detects the latitude and longitude from information obtained by receiving radio waves transmitted from communication satellites in the outer space.
However, the prior art suffers the following problems.
Since radio waves transmitted from the communication satellites in the outer space must be used, the position cannot be measured at a position very close to a skyscraper or under the ground.
Since only the latitude and longitude of the terminal position are detected based on radio waves supplied from the communication satellites, each terminal must have area information required for navigation, and a large-capacity storage medium must be prepared on the terminal side.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a radio communication device which can be used as a navigation device even at a position very close to a skyscraper or under the ground.
It is another object of the present invention to provide a radio communication device which can be used as a navigation device that does not require any large-capacity storage device.
Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
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English Abstract of Japanese Patent Application No. 4-51281.
Canon Kabushiki Kaisha
Lee Benjamin C.
Morgan&Finnegan, LLP.
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