1 digital noise radar walton & dieter 2002 ieee ap-s/ursi digital noise radar e. k. walton &...
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
DIGITAL NOISE RADAR
E. K. WALTON & D. A. DIETERThe Ohio State UniversityElectroScience Laboratory
1320 Kinnear RoadColumbus, Ohio 43212
walton.1@osu.eduwww.esl.eng.ohio-state.edu
2002 IEEE AP-S/URSI
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
ARRAY IMAGE: 2-6 GHz, 1.8 METER ARRAYCINDER BLOCK (6 M) & TREE (15 M)
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
ARRAY IMAGE. 2-6 GHz, 1.8 M. SPAN, CINDER BLOCK IN FOLIAGE
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
PC OROTHER
CONTROLLER
DIO A-D
PRNGENERATOR
UPCONVERTER*
BASE PRN
PRN + DELAY t
TX OUT
RX IN (4 ANTENNAS)
CORRELATIONRECEIVER
* Can be replaced with Diplexer and Amplifier
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Channels #1 - #3are identical to below channel #4
UPCONVERTED,DELAYED PRNWAVEFORM
IN FROM ANTENNAS1 - 4
3-3.8GHz
3-3.8GHz
BASEBAND
BPF15Hz - 5kHz
FINAL OUTPUTTO PC A/D CARD
ONE CHANNEL OF THE RECEIVE SYSTEM
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
C4
-15V
R5
C8
C10
RF - 50 OHMS
12
C5
R8
Q2
1
3
2
411
OUT
+
-
V+V-
-15V
R4
C3
FROM ANTENNA
+15V
Q4
C1
R6
1k
R7
C2
R10
L2
FROM POWER DIVIDERS
+15V
R3
TO A/D
<Doc> 1
PRN RADAR RECEIVER - DAVE DIETER
A
1 1Monday, March 11, 2002
Title
Size Document Number Rev
Date: Sheet of
Q1
R1
Q3
+15V
1
3
2
411
OUT
+
-
V+V-
R2
C6
L1
R9
C9
Schematic of the Final Design for the Receiver
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
CORRELATION RECEIVERSWITH ANTENNA ARRAY
HIGH SPEEDDIGITAL BOARD
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
BLOCK DIAGRAM FOR THE UPCONVERTER
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
UP CONVERTER SYSTEM
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
UP CONVERTER
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Vivaldi Tapered Slot Antenna (TSA) array. •wideband response from 3 - 4GHz•low-profile and low-drag form, •appropriate antenna pattern, •minimized cost and complexity. up to 40 elementsThe Vivaldi TSA•fabricated from a single sheet of RF laminate•E-plane beamwidth of 50°•H-plane beamwidth of 35° (H.P.)
12The Antenna Array with Receiver Board Connected
DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
E- PLANE CUT H-PLANE CUT
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
SOFTWARE CONTROL PROCESS
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Plot of amplitude of detected signal (voltage) as a function ofscan number and distance (feet) for a walking person (w. smallcorner reflector) FFT-based system
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Impulse response (correlation value (v) versus time (ns)) for the pseudo-noise radar looking through a 50 foot coaxial cable
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Output of radar correlator (v) as a function of elapsed time (s) as a person carrying a 1-m.corner reflector moved past the set range gate. (Range set to 70 feet, person moving atapproximately 3 feet per second) (top plot 25 second record; bottom plot blow up of the regionnear the response)
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Detailed subset of the correlator response profiles. Response of the correlatoroutput as a function of elapsed time as a person carrying a small corner reflectorwalked away from and then toward the radar.
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Correlator output (v) as a function of elapsed time for four different widely spacedrange gates as a person carrying a small corner reflector walked toward the radar.
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
Correlator output (v) as a function of elapsed time for fourdifferent closely spaced range gates as a person carrying a smallcorner reflector walked away from and then toward the radar.
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DIGITAL NOISE RADAR WALTON & DIETER 2002 IEEE AP-S/URSI
CONCLUSIONS:•A SMALL LOW POWER UWB RADAR CAN BE USED TO DETECT/IMAGE OBSTACLES IN FOLIAGE•IT IS POSSIBLE TO BUILD AN 800 MHZ PSEUDORANDOM NOISE RADAR TO PERFORM THIS FUNCTION •THE RESULTING RADAR CAN LOCATE MULTIPLE SCATTERERS IN FOLIAGE•THE SYSTEM CAN USE LOW COST COTS DEVICES
WALTON.1@OSU.EDU614/292-5051
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