Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1993-11-12
1996-12-24
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
342 51, G08G 101
Patent
active
055877125
ABSTRACT:
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 frequency generating devices.
REFERENCES:
patent: 4983976 (1991-01-01), Ogata et al.
patent: 5196846 (1993-03-01), Brockelsby et al.
patent: 5245332 (1993-09-01), Katzenstein
patent: 5278563 (1994-01-01), Spiess
patent: 5302954 (1994-04-01), Brooks et al.
Boone Steven F.
Ho Edward J.
Hellner Mark
Lidd Francis J.
Mark IV Transportation Products Corp.
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