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![Page 1: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/1.jpg)
Objective Testing and Performance Objective Testing and Performance Measurement of Automotive Crash Measurement of Automotive Crash
Warning SystemsWarning Systems
Presented by:
Rick NorcrossNational Institute of Standards and Technology
Authors – Sandor Szabo, Richard Norcross, Joseph Falco
ITS America 2007 Annual Meeting & Exposition June 6, 2007
![Page 2: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/2.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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Objective Test Evaluation Process
Review Crash Data
Conduct tests and Collect DataAnalyze DataReport Results
1 1.2 1.4 1.6 1.8Departure angle (Deg)0.250.50.751
1.251.5
y(m) Distance to barrierat time of warning
Crash Prevention Boundary
crash
no crash
POV1SV
POV2
POV1
Develop Test Scenarios
Specify/Build/Characterize the IMS
Develop Objective Test Procedures
![Page 3: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/3.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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Independent Measurement System (IMS)
Measures key performance values to verify test conducted properly and to evaluate performance of warning system.
![Page 4: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/4.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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Characterize IMS Sensors - StaticStationary Sensor Performance • Part of developing ASTM Standard for 3Di Sensors
– Combined Effort of MEL, BFRL, ATP • Measure error and uncertainty of standard target for
given variable factors and ranges• Results: error is ~1 % 0.1% of range
– (-0.8 m ± 8 cm at 72 m) – IVBSS Spec <5% of range
• (<3.6m @ 72 m)
1 20 40 60 72-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
Nominal Range (m)
Ran
ge E
rror
(m
)
Range Error vs. (Range, All Runs)Instrument Azimuth = 0 deg ; Target Reflectance = 99%; Target AOI = 0 deg;
Run 1
Run 2
Run 3
Variable Factors
Range 1, 20, 40, 72 (m)
Target Reflectance 99, 50, 2 (%)
Target Angle of Incidence 0, 30, 60 (deg)
Instrument Azimuth Angle -60, 0, 60 (deg)
Environment Indoor, Outdoor
Time Day/NightLaser scanner Target
![Page 5: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/5.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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Characterize IMS Sensor - DynamicDynamic Sensor Performance • Set up course of reflective strips at measured distances from a target• Add optic sensor and enhanced GPS to vehicle to detect strips• Drive by target and record time vehicle crosses reflectors • Determine range sensor’s measured distance to target at time when vehicle
crosses reflector
Vehicle traveling at 30 m/s (67 mi/h)
3 cameras
2 laser scanners
Downlookng camera and optical switch
optical reflectors on ground at0, 20, 40 and 60 m
Cylindrical target
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ITS America 2007 Annual Meeting June 6, 2007
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Example: Dynamic Error
• Cylinder ranges don’t overlap when vehicle moving (30 m/s) due to error in timing synchronization between sensors
• Right measurements closer than left measurements because vehicle moved between scans. Error proportional to relative velocity
Barrel at 20 m Surveyed reflector
Down view from bumperForward viewRight scanner
Left scanner
GPS Time
![Page 7: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/7.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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IMS Performance Test
• Used police training track in Sykesville, MD
• Focused on performance of laser scanner and ability to meet IVBSS test procedure needs
• Test used was “SV approaches slow moving lead vehicle”
SV approaching slowing POV IBEO range data
![Page 8: Objective Testing and Performance Measurement of Automotive Crash Warning Systems Presented by: Rick Norcross National Institute of Standards and Technology.](https://reader036.fdocuments.net/reader036/viewer/2022062321/56649e8e5503460f94b91f14/html5/thumbnails/8.jpg)
ITS America 2007 Annual Meeting June 6, 2007
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IMS Analysis Software
• Extended from RDCWS to support IBEO data analysis
Range data
DV video (30Hz)
IBEO video (10Hz)
Video and range data all synchronized to GPS time
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ITS America 2007 Annual Meeting June 6, 2007
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Concluding Remarks
• Accomplishments to Date:– Evaluated IMS range sensor static and dynamic performance
• Initiated upgrade of range sensor to provide longer range, higher angular resolution, wider FOV and improved synchronization
– Developed common IMS sensor mounting bracket for LV and HT– Started IMS integration testing on LV and HT
• Activities in 2007– Evaluate upgraded range sensor static and dynamic
performance– Complete IMS integration testing on LV and HT – Use IMS to evaluate IVBSS performance during phase 1
track and on-road test activities