Communications: electrical – External condition vehicle-mounted indicator or alarm – Highway information
Patent
1995-08-28
1999-06-29
Urban, Edward F.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Highway information
340936, 455 66, 342 60, G08G 109
Patent
active
059174307
ABSTRACT:
A system for transmitting messages, such as safety hazard warning messages, to vehicles causes alerts to be generated in conventional radar detectors and more detailed messages to be provided to drivers with message capable radar receivers. The transmitted radar signal is modulated in frequency or phase or swept in frequency in different directions or at different rates to define the logical state of each bit of the message. A continuous wave (CW) maker signal may also be transmitted to assure detection by a conventional police radar detector and to allow a receiver capable of decoding messages to make adjustments that center an intermediate frequency (IF) generated from the received signal in the receiver IF passband. A message capable receiver decodes the modulated signal to communicate to the vehicle operator the contents of the transmitted message or a stored message corresponding to a transmitted code. The signal modulation is such that conventional radar detectors do not reject the signal but cause an alert to be generated, indicating to the driver the need to reduce vehicle speed to accommodate upcoming road conditions or obstacles.
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Greneker, III Eugene F.
Warren Walter Bruce
The Safety Warning System, L.C.
Urban Edward F.
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