Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1995-06-07
1997-11-11
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 44, 342 51, G01S 1376
Patent
active
056869207
ABSTRACT:
A method and system is provided for communicating permanent or semi-permanent information to a transponder (14) from an interrogator (12), preferably operated by a toll agency or other authorized entity. This permanent or semi-permanent information is communicated by means of special instructions valid only during a special mode or maintenance mode which is entered by transmitting a special access code to the transponder (14) from the authorized interrogator (12). The transponder (14) will preferably acknowledge to the authorized interrogator (12) that it is, in fact, operating in the maintenance mode so the interrogator (12) can transmit the special instructions in confidence.
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Frazee Francis B.
Hurta Dwaine S.
Donaldson Richard L.
Kesterson James C.
Mapstone Rebecca A.
Sotomayor John B.
Texas Instruments Incorporated
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