detecting aacn communications during crash tests · sae government industry meeting | january...
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SAE Government Industry Meeting | January 25-27, 2017SAE Government Industry Meeting | January 25-27, 2017
Detecting AACN
Communications
During Crash Tests
John Martin
SAE Government Industry Meeting | January 25-27, 2017
Agency Goals
• Agency goal was to understand how we might objectively evaluate AACN
system performance
• NHTSA undertook research to establish a test procedure that could be
used for this purpose
• NHTSA defined general system/performance requirements, then
established a detailed protocol for evaluation
2
SAE Government Industry Meeting | January 25-27, 2017
General Requirements
• An AACN equipped vehicle should automatically establish communication
with a telematics service provider (TSP) or public safety answering point
(PSAP) after a crash test without intervention by an outside agent
3
SAE Government Industry Meeting | January 25-27, 2017
AACN Information Required from the Test
• Detection of communication between a crash test vehicle and the telematics service provider (TSP)
– An indication that the crashed vehicle is in communication with the public safety answering point (PSAP) or telematics service provider (TSP) after the crash
– Independent verification of RF transmission from the vehicle
• RF detection and recording device
• The contents of the crash data transmitted to the TSP or PSAP
– An indication of the contents of the crash data transmitted to the TSP PSAP
– Independently obtaining the contents of this data is not possible, assuming secure communication between the vehicle and the TSP or between the vehicle and the PSAP
• Ask the TSP or PSAP for the data or a subset of the data they receive, in one example, OnStar did provide information on an NCAP crash test
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SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
5
0 20 40 60 80 100 120 140 160 180 2000
0.5
1
1.5
2
2.5
X: 29.89
Y: 2.5
OnStar Call 2/11/2016
2016 Chevy Malibu
Voltage
Time (seconds)
HiBand
LowBand
Trigger
AACN Call
Ends (86.38 sec)
AACN Call
Begins
(35.15 sec)
Recording
Trigger
(29.89 sec)
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
6
• Goal is to deliver an indication of a transmitted signal’s power to a data acquisition system
• Must be able to survive a crash test
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
7
• Earlier version
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
8
• Piggy-backed NCAP tests
revealed weak voltage
regulation circuitry
– Two frontal, one side
• One failure to take data for
reasons unknown
• Frequency of actual crash
tests not high enough for
verification purposes
• Series of sled tests
SAE Government Industry Meeting | January 25-27, 2017
RF Detector Sled Testing
9
Channel Name <Min Value> <Max Value>
Vel
oci
ty [
mi/
h]
Time [ms]Filter Class: CFC 180
at
Time [ms]
Acc
eler
atio
n [
g]
at
at
at
-50 0 50 100 150 200 250 300 350
-40
-35
-30
-25
-20
-15
-10
-5
0
5
-50 0 50 100 150 200 250 300 350-40
-35
-30
-25
-20
-15
-10
-5
0
Duration = 78.26 ms
Pre
liminar
y
Sled Test #S161005-1 Pulse
TRC Inc. Test Lab: SLEDCustomer: VRTC
Test Number: S161005-1 Pulse
Date: 10/05/2016
Time: 12:25
-35.62 g 42.72 ms 0.78 g 94.88 ms
-37.88 mi/h 77.76 ms 0.00 mi/h 0.00 ms
S0SLEDCY0000ACXD
S0SLEDCY0000VEXC
S0SLEDCY0000ACXD
S0SLEDCY0000VEXC
Filter Class: CFC_60
Out of five 35 G, 38mph sled tests with a variety of orientations, two minor failures,
no structural failures of circuitry
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
10
• Later version shown here
• Developed in conjunction with TRC, but
MGA Research Corporation and Calspan
are building similar RF detectors using
the draft AACN test procedure… lessons
learned will be wrapped back into the
AACN test procedure
SAE Government Industry Meeting | January 25-27, 2017SAE Government Industry Meeting | January 25-27, 2017
JOHN.MARTIN@DOT.GOV
11
Thank You
SAE Government Industry Meeting | January 25-27, 2017SAE Government Industry Meeting | January 25-27, 2017
JOHN.MARTIN@DOT.GOV
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Backup Slides
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
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• RF Detection Circuit Internals
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
14
• RF Detection Circuit Internals
ZX60-V62+Amplifier
ZX60-H242+Amplifier
ZX47-40LN-SPower Detector
ZX47-40LN-SPower Detector
VBF-1840+Band-Pass Filter1750-1930 MHz
VBFZ-925-S+ Band-Pass Filter800 – 1050 MHz
Peak Analog Micromod 1
Neo Fire 2
ZAPD-2DC-S+
RF Splitter
Data Acquisition
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
15
• RF Detection Circuit Internals
SAE Government Industry Meeting | January 25-27, 2017
RF Detector for Crash Tests
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• RF Detection Circuit Internals
SAE Government Industry Meeting | January 25-27, 2017
17
SAE Government Industry Meeting | January 25-27, 2017
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Part Number Description Manufacturer
VBF-1840+ Band-Pass Filter Mini-Circuits
VBFZ-925-S+ Band-Pass Filter Mini-Circuits
ZX60-V62+ RF Amplifier Mini-Circuits
ZX60-H242+ RF Amplifier Mini-Circuits
ZX47-40LN-S RF Power Detector Mini-Circuits
ZAPD-2DC-S+ RF Power Splitter Mini-Circuits
LM317 Voltage Regulator Various
LM7805C Voltage Regulator Various
TG.10.0113 Cellular Antenna Taoglas Antenna Solutions
Neo VI Fire CAN Logger Intrepid Controls Systems
Inc.
MicroMod Analog 1 Analog to CAN
Converter
Peak-System
SAE Government Industry Meeting | January 25-27, 2017
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SAE Government Industry Meeting | January 25-27, 2017
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Sled Test Device Orientations
Front
Front
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