Communication device using an UWB wireless wave

• US 20050068225A1
• Filed: 02/20/2004
• Published: 03/31/2005
• Est. Priority Date: 09/25/2003
• Status: Active Grant

• Current Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Component Limited (Fujitsu Limited)
• Inventors: Arita, Takashi, Inoue, Hiroto
• Granted Patent: US 7,102,537 B2
• Time in Patent Office: Days
• US Class Current: 342/70
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/867 Combination of radar systems with cameras
• CPC Class Codes: G01S 2013/9316 combined with communication equipment with other vehicles or with base stations
• CPC Class Codes: G01S 3/50 the waves arriving at the antennas being pulse modulated and the time difference of their arrival being measured

Abstract

A communication device is disclosed which is comprised of: a transmitter for transmitting an ultra wide band wireless wave pulse; multiple receivers which are disposed equidistant from the transmitter and receive the ultra wide band wireless wave pulse; and distance-measuring equipment which detects a distance or a direction to an object by measuring time intervals between the first reception times when receivers receive the ultra wide band wireless wave pulse directly from the transmitter and the second reception times when the receivers receive a object-reflected wave of the ultra wide band wireless wave pulse.

Claims

1. A communication device comprising:

a transmitter for transmitting an ultra wide band wireless wave pulse;

a plurality of receivers which are disposed equidistant from the transmitter and receive the ultra wide band wireless wave pulse; and

distance-measuring equipment which detects a distance or a direction to an object based on reception times when each of the receivers receives the ultra wide band wireless wave pulse directly from the transmitter and an object-reflected wave thereof.

2. The communication device as claimed in claim 1, wherein communication is performed by the transmitter and the receivers using the ultra wide band wireless wave pulse.

3. A vehicle-installed system comprising:

a plurality of appliances, each of which is installed in a vehicle and is equipped with a communication device which performs communication between the appliances using an ultra wide band wireless wave pulse.

4. A communication device comprising:

first communicating means for performing communication using an ultra wide band wireless wave pulse; and

communication controlling means which searches for a second communicating means around the first communicating means and establishes a communication network with the second communicating means.

5. The communication device as claimed in claim 4, wherein the communication controlling means establishes a communication network with a third communicating means which is located out of a communication area of the first communicating means but is located within the communication area of the second communicating means with which communication has been established.

6. A communication system comprising:

a plurality of communication devices, each of which is able to establish communication with another communication device located within a predetermined area by searching for the other communication device located within the predetermined area, wherein communication with yet another communication device located out of the predetermined area is established via a communicating device located within the predetermined area.

7. An anti-theft system comprising:

a communication device for transmitting and receiving an ultra wide band wireless wave pulse; and

a warning device which generates an alarm if a moving object is continuously detected in a predetermined area for a predetermined time, said detection of the moving object being based on a reception of a moving object-reflected wave of the ultra wide band wireless wave pulse by the communication device.

8. A communication system comprising:

a detector including a transmitter which transmits a response request using an ultra wide band wireless wave pulse;

a plurality of receivers which are disposed equidistant from the transmitter and receive the ultra wide band wireless wave pulse; and

distance-measuring equipment which detects a distance or a direction to an object based on reception times when each of receivers receives the ultra wide band wireless wave pulse directly from the transmitter and an object-reflected wave thereof; and

a response device including a receiver which is installed on the object and receives the ultra wide band wireless wave pulse transmitted from the transmitter of the detector; and

a transmitter which transmits a response request using another ultra wide band wireless wave pulse in response to the reception of the ultra wide band wireless wave pulse from the detector by the receiver of the response device.