H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/59 (2006.01) G06K 7/00 (2006.01) G06K 7/10 (2006.01) G08G 1/042 (2006.01) G01S 13/82 (2006.01)
Patent
CA 2134162
ABSTRACT OF THE DISCLOSURE An improved transponder for use in identifying an controlling vehicles wherein transponders mounted on vehicles respond to signals from a fixed location interrogator providing information relative to the vehicle or other data as required. The transponder disclosed in particular utilizes an improved method of providing frequency shift keyed (FSK) signals in response to a trigger or command signal received from a ground mounted loop or antenna. As disclosed, the transponder of the invention generates FSK signals through programming multiple microprocessor loops of predetermined duration, each loop providing microprocessor highs and lows for transmission to the interrogating station. Utilization of the inherently accurate microprocessor cycle time to generate distinct FSK signals avoids problems with ordinarily used analog fre- quency generating devices.
Boone Steven F.
Ho Edward J.
Mark IV Transportation Products Corporation
Shapiro Cohen
LandOfFree
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