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


Overview

SLiMS Overview

Emissions Measurements

Results

Conclusions

2

Institute for Telecommunication Sciences – Boulder, Colorado 3

Shore Line Monitoring System (SLiMS)

Navy PSEAG Water-Side Security (WSS)

Steven Gunderson

Project Manager

DOD E3 Meeting

Orlando, Florida

April 3, 2012

Institute for Telecommunication Sciences – Boulder, Colorado 45/26/2016

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)

Institute for Telecommunication Sciences – Boulder, ColoradoJuly 2010 5

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


5/26/2016

Naval Airfield Enclave


Redstone Arsenal


Overview

SLiMS Overview

Emissions Measurements

Results

Conclusions

8


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


P400

RadarSpectrum Analyzer

or

Oscilloscope

Low-Loss

Microwave

Cable

Conducted Setup


Conducted Setup cont’d


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

13


Spectrum Analyzer

or

Oscilloscope

LNA

Rx

Antenna

Positioner

SLiMS

Pole

Radiated Test Setup


Dish

Dish

DRH-2

DRH-1

DRH-2

DRH-1

|𝑆21(1)

|

|𝑆21(2)

|

|𝑆21(3)

|

3-Antenna Measurements


Vector

Network

Analyzer

Transmit

Port 1

Receive

Port 2

d


Antenna Calibrations


Radiated Calibrations


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


Time-Domain Characteristics

July 2010 24

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


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


26

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


2000 4000 6000 8000 10000 12000 14000-70

-60

-50

-40

-30

-20

-10

Frequency MHz

EIR

P d

Bm


2000 4000 6000 8000 10000 12000 14000-80

-75

-70

-65

-60

-55

-50

-45

-40

-35

-30

Frequency MHz

EIR

P (

dB

m)


Radiated

Results

d=3 m

Average

Peak


2000 4000 6000 8000 10000 12000 14000-80

-70

-60

-50

-40

-30

-20

-10

Radiated

Noise

Floors

d=3 mAverage

Peak


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


Extrapolations with DRH & Dish

30

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


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…


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)

32


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…

34


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


Questions?


emissions measurements of an ultrawideband imaging … johnk... · · 2016-06-02institute for...

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