Emissions Measurements of an Ultrawideband Imaging … Johnk... · · 2016-06-02Institute for...
Transcript of Emissions Measurements of an Ultrawideband Imaging … Johnk... · · 2016-06-02Institute for...
Bob Johnk, Frank Sanders, Kristen Davis, Ron Carey, John Ewan, Geoff Sanders
Institute for Telecommunication Sciences (NTIA/ITS)Boulder, Colorado
&Steve Gunderson
Naval Facilities Engineering CommandPort Hueneme, California
IEEE EMC TC-6/G46 Meeting Pittsburgh, PAAugust, 7 2012
Institute for Telecommunication Sciences – Boulder, Colorado
Emissions Measurements of an UltrawidebandImaging Surveillance Radar
Institute for Telecommunication Sciences – Boulder, Colorado
Overview
SLiMS Overview
Emissions Measurements
Results
Conclusions
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Shore Line Monitoring System (SLiMS)
Navy PSEAG Water-Side Security (WSS)
Steven Gunderson
Project Manager
DOD E3 Meeting
Orlando, Florida
April 3, 2012
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Shore Line Monitoring System (SLiMS)
Objectives: All-Weather Capability• Heavy Fog and High Precipitation
Discriminate and Classify Targets• Greatly Reduce Nuisance and False Alarms (NAR/FAR)
• Order of Magnitude Reduction of NAR/FAR Achieved
Goals: High Probability of Detection (PD)
High Probability of Correct Classification (PCC)
Low Nuisance/False Alarm Rate (NAR/FAR)
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Architecture: 3D Sparse Array• Staggered Poles
• Measures Target Geometry
Automatic Target Classification• Ignores Small Animals & Birds
• Order-of-Magnitude Lower NAR/FAR
Technology:
All-Weather Radar• Ultra-Wide Band (UWB)
• FCC Part 15 Unlicensed
Sonar-Like Algorithms• Target Tracking & Classification
• Biped & Quadruped
Architecture & Technology
NAS Whidbey Island
Airfield Enclave
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5/26/2016
Naval Airfield Enclave
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Redstone Arsenal
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Overview
SLiMS Overview
Emissions Measurements
Results
Conclusions
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Measurements of UWB Emissions
Time- and Frequency-Domain
Conducted (Hardline) & Radiated Emissions
High-Speed Oscilloscope (12 GHz BW)
Spectrum Analyzer
1-15 GHz
Peak & RMS Average
Power & EIRP
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P400
RadarSpectrum Analyzer
or
Oscilloscope
Low-Loss
Microwave
Cable
Conducted Setup
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Conducted Setup cont’d
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Conducted Setup cont’d
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Radiated Measurements
5 m fully Anechoic Chamber Located at Boulder Commerce Labs
Boresight Measurements at d=3 m
Extrapolation Measurements at Selected Frequencies (2-5 m)
Elevation and Azimuth Patterns
DRH & Dish Antennas
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Spectrum Analyzer
or
Oscilloscope
LNA
Rx
Antenna
Positioner
SLiMS
Pole
Radiated Test Setup
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Radiated Measurements
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Radiated Measurements
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Radiated Measurements
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Dish
Dish
DRH-2
DRH-1
DRH-2
DRH-1
|𝑆21(1)
|
|𝑆21(2)
|
|𝑆21(3)
|
3-Antenna Measurements
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Vector
Network
Analyzer
Transmit
Port 1
Receive
Port 2
d
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Antenna Calibrations
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Radiated Calibrations
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2000 4000 6000 8000 10000 12000 140006
8
10
12
14
16
18
20
22
24
Frequency (MHz)
Realiz
ed G
ain
(dB
)
Dish Antenna
DRH Antenna
Antenna Gains
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Time-Domain Characteristics
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1 1.5 2 2.5 3 3.5 4 4.5 5-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
Time (nsec)
An
ten
na T
erm
ina
l V
olta
ge
(V
)
SLiMS UWB Impulse
0 10 20 30 40 50 60-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
Time (nsec)
An
ten
na T
erm
ina
l V
olta
ge
(V
)
57.5 ns
Interval Between Emitted Impulses
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
Time (sec)
Vo
lta
ge
at
An
ten
na T
erm
ina
ls (
V)
No Signal
0.024 sec
0.269 sec
Burst of Impulses
TDMA Signal Structure
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Convergence with # of Bursts
Average Peak
3000 3500 4000 4500 5000 5500 6000-55
-50
-45
-40
-35
-30
-25
Frequency MHz
Co
nd
ucte
d P
ow
er
(dB
m)
1 burst
2 bursts
3 bursts
4 bursts
1,2,3,4 Bursts, rbw = 1 MHz
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2000 4000 6000 8000 10000 12000 14000-100
-90
-80
-70
-60
-50
-40
-30
Frequency MHz
Conducte
d P
ow
er
(dB
m)
8.0 MHz3.0 MHz1.0 MHz0.3 MHz0.1 MHz
2000 4000 6000 8000 10000 12000 14000-90
-80
-70
-60
-50
-40
-30
-20
-10
Frequency MHzPeak Conducted Power (dBm)
Average
Peak
Conducted
Results
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2000 4000 6000 8000 10000 12000 14000-70
-60
-50
-40
-30
-20
-10
Frequency MHz
EIR
P d
Bm
8.0 MHz3.0 MHz1.0 MHz0.3 MHz0.1 MHz
2000 4000 6000 8000 10000 12000 14000-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
Frequency MHz
EIR
P (
dB
m)
8.0 MHz3.0 MHz1.0 MHz0.3 MHz0.1 MHz
Radiated
Results
d=3 m
Average
Peak
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2000 4000 6000 8000 10000 12000 14000-80
-70
-60
-50
-40
-30
-20
-10
Radiated
Noise
Floors
d=3 mAverage
Peak
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2000 4000 6000 8000 10000 12000 14000-70
-60
-50
-40
-30
-20
-10
0
Frequency MHz
EIR
P d
Bm
(B
W =
8 M
Hz)
peak cover
peak no cover
avg cover
avg no cover
Impact of Radome, rbw = 8MHz
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Extrapolations with DRH & Dish
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2000 4000 6000 8000 10000 12000 14000-70
-65
-60
-55
-50
-45
-40
-35
-30
Frequency MHz
Avera
ge E
IRP
dB
m
Average EIRP as a function of distance (DRH Antenna)
4 m3 m2 m
DRH Dish
rbw = 8 MHz
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2000 4000 6000 8000 10000 12000 14000-90
-80
-70
-60
-50
-40
Frequency MHz
EIR
P d
Bm
(bw
=1 M
Hz)
FCC Part 15 UWB Masksurveillance equipment
10 dBBW
Comparisons with FCC Part 15 Limits
Compliant…
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Comparisons with FCC Part 15 Limits
1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
Frequency MHz
EIR
P d
Bm
(bw
=1 M
Hz)
GPS Bands (1-2 GHz)
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Status
HERO Analysis Completed by NSWC Engineers
Approved (31 Jan 2012)
STA Approved on 15 March 2012 for Operation at DOE’s Oak Ridge TN Facility
1494 in Process approved for NAS Whidbey Island Deployment
1494 Processes Started for Other Locations…
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Conclusions
SLiMS System is Shared Spectrum System Based on UWB Technology
Complies with Existing Part 15 Limits
Very Low Power System with Very Low Potential for Interference
Improved Security for Critical Assets
Demonstrates UWB as Viable Spectrum Sharing Method
As always, just more geeky fun…35
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Questions?
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