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

[email protected]

2002 IEEE AP-S/URSI

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ARRAY IMAGE: 2-6 GHz, 1.8 METER ARRAYCINDER BLOCK (6 M) & TREE (15 M)

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ARRAY IMAGE. 2-6 GHz, 1.8 M. SPAN, CINDER BLOCK IN FOLIAGE

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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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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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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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CORRELATION RECEIVERSWITH ANTENNA ARRAY

HIGH SPEEDDIGITAL BOARD

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BLOCK DIAGRAM FOR THE UPCONVERTER

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UP CONVERTER SYSTEM

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UP CONVERTER

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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


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E- PLANE CUT H-PLANE CUT

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SOFTWARE CONTROL PROCESS

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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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Impulse response (correlation value (v) versus time (ns)) for the pseudo-noise radar looking through a 50 foot coaxial cable

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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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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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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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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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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

[email protected]/292-5051

1 digital noise radar walton & dieter 2002 ieee ap-s/ursi digital noise radar e. k. walton &...

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