Method to prevent rouge transponder responses in automatic vehic

Details Method to prevent rouge transponder responses in automatic vehic Method to prevent rouge transponder responses in automatic vehic

1997-04-09

1999-09-21

Swarthout, Brent A.

Communications: electrical

Traffic control indicator

Combined

235384, 370286, 375346, 455 1, 455 63, G08G 100

Patent

active

059559691

ABSTRACT:
A method of preventing a response to a rouge poll message in an AVI system is presented. The method entails that during the transmission of the poll message from the interrogator to the transponder, wherein the poll message reflects off an undesirable position, thereby creating the origination of an undesirable poll message, i.e. a poll message which will be received by a wrong transponder, a jamming signal is also transmitted at the same frequency and from the point from which said reflected poll message originates. The jamming signal and the poll message create a rogue poll message as received by the transponder wherein at least one bit within the transmitted poll message is flipped. Transponders, upon receiving said rogue poll message, calculate the CRC and compare the calculated CRC with the received CRC. The rogue message should yield an invalid CRC, i.e. a CRC unlike the received CRC, and therefore, the transponder will fail to respond to the jammed poll message.

REFERENCES:
patent: 4317214 (1982-02-01), Attinello
patent: 5406275 (1995-04-01), Hassett et al.
patent: 5659609 (1997-08-01), Koizumi et al.
patent: 5675342 (1997-10-01), Sharpe
patent: 5701127 (1997-12-01), Sharpe

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