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Format of Data/Findings Distance between antennas (in blue)Distance between antennas (in blue) Distance value on right axisDistance value on right axis
Distance between antennas (in blue)Distance between antennas (in blue)
Two Static Antennas 200m range, 200 bytes, ~100 msec update rate200m range, 200 bytes, ~100 msec update rate Direct Line of Sight (LoS), no packet lossDirect Line of Sight (LoS), no packet loss
Two Static Antennas Obstructed LoS (stationary SUVs)Obstructed LoS (stationary SUVs) No packet loss at various distancesNo packet loss at various distances
Two Static Antennas 35m range, obstructed LoS (large box truck)35m range, obstructed LoS (large box truck) Vehicles positioned laterally – no packet lossVehicles positioned laterally – no packet loss
Two Static Antennas 39m range, obstructed LoS (large box truck)39m range, obstructed LoS (large box truck) Positioned longitudinally – some loss of packetsPositioned longitudinally – some loss of packets
One Dynamic, One Static Antenna Transmitting vehicle ~40 mph, with obstructionTransmitting vehicle ~40 mph, with obstruction No packet lossNo packet loss
Two Dynamic Antennas 2 vehicles ~ various speeds, same direction 2 vehicles ~ various speeds, same direction Distances up to 150 m, no packet lossDistances up to 150 m, no packet loss
Two Dynamic Antennas Various speeds, same direction, ~150 m rangeVarious speeds, same direction, ~150 m range Cut-in SUV, no packet lossCut-in SUV, no packet loss
Two Dynamic Antennas Sender vehicle and SUV brake to a stopSender vehicle and SUV brake to a stop Lost packets are likely due to SUV obstructionLost packets are likely due to SUV obstruction
Two Dynamic Antennas Receiver passes sender braking from 30 – 0 mphReceiver passes sender braking from 30 – 0 mph Packet loss at ~ 90 mPacket loss at ~ 90 m
Two Dynamic Antennas Sender and receiver pass at 50 mphSender and receiver pass at 50 mph ~50 msec, 400 bytes, no packet loss~50 msec, 400 bytes, no packet loss
Multipath Considerations Null spot found through slow-rolling testNull spot found through slow-rolling test Loss of packets between ~ 87 m and 94 mLoss of packets between ~ 87 m and 94 m
Track entrance
SUV – sender stopped. Facing west
LeSabre - receiver driving on the shoulder towards
Multipath Considerations Steady state test at ~ 92 m null spotSteady state test at ~ 92 m null spot Almost complete loss of packetsAlmost complete loss of packets
Test Track Conclusions Single-sender, single-receiver DSRC under direct LoS Single-sender, single-receiver DSRC under direct LoS
conditions is robust for a variety of vehicle-vehicle and conditions is robust for a variety of vehicle-vehicle and vehicle-infrastructure safety applicationsvehicle-infrastructure safety applications
Some degree of packet loss, as expectedSome degree of packet loss, as expected Multipath transmissionsMultipath transmissions Vehicle obstructing LoSVehicle obstructing LoS
Range, update rate, and latency requirements for the Range, update rate, and latency requirements for the Task 3 safety applications should be feasibleTask 3 safety applications should be feasible
Areas for future study include:Areas for future study include: Transmission power variationTransmission power variation Multi-sender, multi-receiver scenariosMulti-sender, multi-receiver scenarios