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US 5,963,149 AGranted
Movable body communication system
AssigneeNippondenso Co., Ltd.
InventorsMichinaga Nagura, Ichiro Yoshida, Rokuro Okada
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AssigneeNippondenso Co., Ltd.
InventorsMichinaga Nagura, Ichiro Yoshida, Rokuro Okada
Estimating the term…
A response unit located on a vehicle performs transmission operations for transmitting signals including a pilot response signal responsive to receipt of a pilot signal from a fixed transceiver. The transceiver uses a highly directive transmission antenna to transmit a beam-shaped signal containing a pilot signal to a communication zone set with respect to a lane along which the vehicle travels. The fixed transceiver also performs data transmission/reception operations with the response unit when it receives a pilot response signal therefrom. The beam-shaped signal is set to have a radiation area smaller than the area of the communication zone and is electronically scanned within the communication zone in a direction orthogonal to the movement direction of the vehicle by a scanner in the transceiver. The scan patterns of beams from transceivers corresponding to adjacent lanes are synchronized so that the scan areas of signals from adjacent transmission antennas do not overlap.
A movable body communication system having at least one transceiver, disposed with respect to at least one movement path of a movable body, for transmitting a transmit signal to said movable body and receiving a response signal transmitted from said movable body responsive to said transmit signal to thereby perform data transmission/reception with said movable body within a time period during a single scan of a communication zone, said transmit signal being transmitted in a beam-shaped pattern having a cross-sectional radiation area smaller than the area of the communication zone, said at least one transceiver comprising:
A method of communicating comprising the steps of:
A communication system including at least one transceiver that transmits a transceiver signal to a moving vehicle, and that receives a response signal from the moving vehicle that is responsive to the transceiver signal for data transmission/reception purposes within a time period during a single scan of a communication zone, said transceiver signal being transmitted in a beam-shaped pattern having a cross-sectional radiation area smaller than the area of the communication zone, the at least one transceiver comprising:
Dependencies are inferred from the claim text.