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Vehicle Safety Communications Project VSC Progress Briefing #2 – Task 4 Field Testing – Overview of Hardware and Software Test Track Results. Outline. Overview of Hardware and Software Test Equipment and Interface Format of Data/Findings Test Track Testing Test Track Facilities

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Presentation Transcript
slide1
Vehicle Safety Communications Project

VSC Progress Briefing #2

– Task 4 Field Testing –

Overview of Hardware and Software

Test Track Results

outline
Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions
test equipment
Test Equipment
  • VSC Communication Test Kits (CTKs)
    • Laptops with 802.11a card
    • DGPS receivers
    • Magmount DSRC and DGPS antennas
    • Portable implementation
slide5

CTK Sender Interface

  • Broadcast duration
  • Update rate
  • Packet size
ctk receiver interface
CTK Receiver Interface
  • Packet number
  • OS/GPS timestamp
  • DGPS location coordinates
slide7

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions
format of data findings
Format of Data/Findings
  • Received packets (in green)
  • Received packets (in green)
  • Lost packets (in red)
format of data findings1
Format of Data/Findings
  • Packet number on left axis
  • Packet number on left axis
  • Accumulated packets (in black)
slide10

Format of Data/Findings

  • Distance between antennas (in blue)
  • Distance between antennas (in blue)
  • Distance value on right axis
slide12

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions
slide13

Test Track Facilities

Test

Track

  • Controlled environment
  • Two-lane test road
  • Straight-away with rural surroundings
  • Overhead bridge can disrupt GPS signal

Overhead

Bridge

slide14

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions

v

v

1

2

d

x1

d

y1

x

z

y

Two Static Antennas

Legend:

Sender

Receiver

two static antennas

v1

v2

dx1

x

dy1

z

y

Two Static Antennas
  • 200m range, 200 bytes, ~100 msec update rate
  • Direct Line of Sight (LoS), no packet loss
two static antennas1
Two Static Antennas
  • Obstructed LoS (stationary SUVs)
  • No packet loss at various distances
two static antennas2
Two Static Antennas
  • 35m range, obstructed LoS (large box truck)
  • Vehicles positioned laterally – no packet loss
two static antennas3
Two Static Antennas
  • 39m range, obstructed LoS (large box truck)
  • Positioned longitudinally – some loss of packets
slide19

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions

d

x1

v

(RSU)

2

f

f

d

y1

x

z

y

One Dynamic Antenna (OBU)One Static Antenna (RSU)

1

Legend:

Sender

Receiver

Obstructer

one dynamic one static antenna

dx1

v1

f

x

dy1

z

y

One Dynamic, One Static Antenna
  • Receiving vehicle ~60 mph
  • No packet loss
one dynamic one static antenna1

dx1

(RSU)

v2

dy1

x

z

y

One Dynamic, One Static Antenna
  • Transmitting vehicle ~60 mph
  • A few lost packets
one dynamic one static antenna2

dx1

(RSU)

v2

dy1

x

z

y

One Dynamic, One Static Antenna
  • Transmitting vehicle ~20 mph
  • A few lost packets
one dynamic one static antenna3

dy1

v1

f

dx1

One Dynamic, One Static Antenna
  • Receiving vehicle ~40 mph, with obstruction
  • No packet loss
one dynamic one static antenna4
One Dynamic, One Static Antenna
  • Transmitting vehicle ~40 mph, with obstruction
  • No packet loss
slide25

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Dynamic Results
  • Multipath Considerations
  • Static Results
  • Conclusions

Two Dynamic Antennas (OBUs)

1

Legend:

Sender

Receiver

Obstructer

two dynamic antennas
Two Dynamic Antennas
  • 2 vehicles ~ various speeds, same direction
  • Distances up to 150 m, no packet loss
two dynamic antennas1
Two Dynamic Antennas
  • Various speeds, same direction, ~150 m range
  • Cut-in SUV, no packet loss
two dynamic antennas2
Two Dynamic Antennas
  • Sender vehicle and SUV brake to a stop
  • Lost packets are likely due to SUV obstruction
two dynamic antennas3
Two Dynamic Antennas
  • Receiver passes sender braking from 30 – 0 mph
  • Packet loss at ~ 90 m
slide30

Two Dynamic Antennas

  • Sender and receiver pass at 50 mph
  • ~50 msec, 400 bytes, no packet loss
two dynamic antennas4
Two Dynamic Antennas
  • Sender and receiver pass at 30 mph
  • Packet loss at ~ 90 m
slide32

Outline

Overview of Hardware and Software

  • Test Equipment and Interface
  • Format of Data/Findings

Test Track Testing

  • Test Track Facilities
  • Static Results
  • Dynamic Results
  • Multipath Considerations
  • Conclusions
multipath considerations
Multipath Considerations
  • Two-Ray Ground Multipath Model
  • Etotal = ED+ ER(ej)
  • Emin = ED– ER when  = π

D: Direct

Line of Sight

R: Reflected

Line of Sight

multipath considerations1
Multipath Considerations
  • Null spot found through slow-rolling test
  • Loss of packets between ~ 87 m and 94 m

West

overpass

LeSabre

-

receiver

driving on the

shoulder towards

SUV.

Facing East.

SUV

sender

stopped.

Facing west

Track entrance

multipath considerations2
Multipath Considerations
  • Steady state test at ~ 92 m null spot
  • Almost complete loss of packets
test track conclusions
Test Track Conclusions
  • Single-sender, single-receiver DSRC under direct LoS conditions is robust for a variety of vehicle-vehicle and vehicle-infrastructure safety applications
  • Some degree of packet loss, as expected
    • Multipath transmissions
    • Vehicle obstructing LoS
  • Range, update rate, and latency requirements for the Task 3 safety applications should be feasible
  • Areas for future study include:
    • Transmission power variation
    • Multi-sender, multi-receiver scenarios