Automatic vehicle identification system, interrogator and respon

Details Automatic vehicle identification system, interrogator and respon Automatic vehicle identification system, interrogator and respon

1994-02-04

1996-07-02

Cangialosi, Salvatore

Pulse or digital communications

Repeaters

Testing

375208, H04B 169

Patent

active

055330452

ABSTRACT:
A mobile unit identifying system comprises: an interrogator having: a spread spectrum signal generation circuit for generating a spread spectrum coding signal using a predetermined pseudo noise signal; and a transmitting antenna for transmitting the spread spectrum coding signal; and a responder having: a memory for storing data; and a modulation unit for modulating radio signals including the transmitted spread spectrum coding signal with the data, the interrogator further comprising: a receiving antenna for receiving the modulated radio signals; and a mixer for mixing the received radio signals with the spread spectrum signal to detect the data. The responder has one or two antennas for receiving or reflecting the spread spectrum coding signal with modulation using a predetermined data. Phase adjusting circuits may be provided in both interrogator and responder to distinguished from reflected waves from reflective objects other than the responder. The responding signal from the responder is distinguished from the reflected waves from the reflective objects through a polarizing transmitting or receiving technique.

REFERENCES:
patent: 4897659 (1990-01-01), Mellon
patent: 5056106 (1991-10-01), Wang et al.

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