A method 700 comprises transmitting a first sequence of light pulses, pulsed at a first rate 702, receiving a second sequence of light pulses 704 from a vehicle, and transmitting a message as a sequence of light pulses, pulsed at a second rate (frequency) 712 based upon the second sequence of light pulses received from the vehicle, wherein the first rate is different from the second rate. The light pulses may be modulated infra-red (IR) radiation. The message may include information regarding vehicle position, motion, size, safety status, path history, encoded into binary. The light receiver may be an IR video sensor. The modulation may be pulse width modulation (PWM). The message may include a basic safety message (bsm). The disclosed handshaking (i.e. data rate negotiating) is intended to achieve communications in the presence of changing environmental (channel) factors such as glare, reflections, fog and spray.
Modulated infrared lighting
12.12.2018
Patent
Elektronische Ressource
Englisch
IPC: | H04W WIRELESS COMMUNICATION NETWORKS , Drahtlose Kommunikationsnetze / G01S RADIO DIRECTION-FINDING , Funkpeilung / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS / H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr |
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