PPT Slide
1) Vehicles with vehicle to vehicle (v-v) communications capability transmit the vehicle’s position, speed, direction of travel, and acceleration at 12 Mbps. One transmission will be sent every 300 ms. This transmission is intended for all vehicles within 10 sec travel time, thus the transmit power (range) will vary with vehicle speed up to a maximum range of 300 meters (~1000 ft). The minimum range will be 110 m (~367 ft). For example, vehicles traveling at 60 mph would transmit at a power level appropriate to reach approximately 270 m (~880 ft) and vehicles traveling at 25 mph or lower would transmit at a power level appropriate to reach approximately 110 m (~367 ft). All vehicles capable of doing so (having OBU and with vehicle speed and position data available) will transmit these messages and all OBU will receive these messages.
2) Vehicles that receive these transmissions and have collision avoidance processing capability compute the position and probability of collision for all transmitting vehicles every 100 ms.
3) A Caution is given to drivers when a possibility of collision is computed with an avoidance maneuver requirement that exceeds .35 g or the equivalent acceleration for the conditions.
4) A Warning is given to drivers when a possibility of collision is computed with an avoidance maneuver requirement that meets or exceeds .50 g or the equivalent acceleration for the conditions.
5) If it can be determined that two vehicles are on an intercepting course, both will use the transmission range of the faster vehicle.
5.9 GHz DSRC VEHICLE TO VEHICLE APPLICATIONS
COOPERATIVE COLLISION WARNING/AVOIDANCE