Received radio wave transmission equipment and mobile body...

Details Received radio wave transmission equipment and mobile body... Received radio wave transmission equipment and mobile body...

2007-05-22

2007-05-22

Kim, Kevin (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C340S010100

Reexamination Certificate

active

10203749

ABSTRACT:
A base station21generates a spectrum-spread spread signal, and transmits up spread signals having different line frequencies to transmission antennas22aand22bon two channels, i.e., A channel and B channel, respectively. The up spread signals are subjected to predetermined individual processings by a specific identification card31and sent back as a down spread signal on an X channel. Therefore, the base station21receives the down spread signal thus sent back by a receiving antenna23. If receiving the down spread signal, the base station21correlates a waveform of the already transmitted up spread signal as a reference waveform with the waveform of the down spread signal. Due to this, the base station21can count identification cards31which send back down spread signals on the X channel and measure distances from the base station21to the respective identification cards31.

REFERENCES:
patent: 5533045 (1996-07-01), Hasegawa et al.
patent: 6343095 (2002-01-01), Moteki et al.
patent: 6483427 (2002-11-01), Werb
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patent: 10-145325 (1998-05-01), None
patent: 11 046179 (1999-12-01), None
patent: WO 92/17947 (1992-10-01), None
Investigation of Calculation/Distance Measurement Method Using Spread Spectrum Communications System; Feb. 23, 2001.

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