1ECE Department SDP07

AdvisorMarinos VouvakisMembersMikeoll EcheverriaMaria GomesJuan Lopez

Harmonic Radar Transceiver

making tracking small animals safe and easy

MDR12/08/2006

2ECE Department SDP07

Background

What is the problem? Tracking some animals is hard but key in biology research

Why is important?Important to understand animals’ behavior

What has been done?

Existing methods are problematic Normally big transmitters

Battery powered

Expensive

Frequent technical failures

3ECE Department SDP07

Solution

What needs to be done?

Tracking should avoid influencing

animal behavior

What are we doing?

Track tagged small animals, insects,

birds Develop small & minimal

complexity tags

Develop a harmonic radar transceiver

Tag (Passive reflector)

Independent of energy

source

Small and light

Inexpensive

Tag

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Principle of Operation

How are we doing it?

RxF0F0 2F0RxTx

F0

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Specs

Range 10 meters

Angle of resolution At most 30 degrees

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System Design

POWER SUBSYSTEM-Power Supply

15 W-Transformers

7V, 9V, 12V

Friis Equation

TAG

Tag Model

Diode Conversion efficiency: Ed = 0.8%

GdhEd Gdf

7ECE Department SDP07

-103 -90 -70-70 -500

10

20

30

40

50Pr vs distance for different Pt

Received Power (dBm)

dist

ance

(m)

29dBm

30 dBm

20 dBm

17dBm

26 dBm

28 dBm

Arriving to Parameters

Transmitting Power 26dBm = 0.4W Signal source VCO enough

Rx Power min: At least -103dBm (sensitivity)

Nois

e fl

oor

Operation point-74.3dBm

Margin=30dB

8ECE Department SDP07

Budget

VCO $50

Directional Coupler $30

Bandpass Filter $0

Power Amplifier $170

TX Antenna $0

RX Antenna $0

Bandpass Filter $100

Frequency Multiplier $48

IF Amplifier $65

Lowpass Filter $37

Total $640

Low Noise Amplifier $65

9ECE Department SDP07

Tag Fabrication and Testing

Fabrication

• AWG#24 copper wire

• Agilent HSCH-5340 beam lead Schottky diodes

Test Procedure

• Power reflection for several tags’ dimensions

• Characterization of tags’ cross sectional area

Picture of the Tag

Test Results

NOT COMPLETE

10ECE Department SDP07

MDR Deliverables

Tag built

Tag tested

Finalized block diagram topology Perform system design simulations using MATLAB

Decision on signal source

Decision on frequency

Cost Analysis and market research

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Next Step

• Borrow available components from Antennas and Propagation Lab, Microwave Remote Sensing Lab, Microwave Instructional Lab

• Buy rest of the components

• Start building the receiver

12ECE Department SDP07

Project Timeline

Tasks Feb Mar April May

• Borrow available components from Labs

• Purchase remaining Components

• Start Building Transmitter

• Start Testing Transmitter

• Start Building Receiver

• Start Testing Receiver

• Integrate/Test Radar with Tag

• Test Entire System

13ECE Department SDP07

Final Deliverables

• A working prototype of the harmonic transceiver (radar) and tag

• Complete project documentation

• The user manual• Mathematical model• System specifications• Block diagram• Schematics• Simulations

14ECE Department SDP07

The End

Thank You!

QUESTIONS?

15ECE Department SDP07

Work Cited

Colpitts C, D. Luke, G. Boiteau, and M. Doyle, Harmonic Radar Identification Tag for Insect Tracking IEEE Canadian Conference on Electrical and Computer Engineering.

Colpitts, Bruce G. Harmonic Radar Transceiver Design: Miniature Tags for Insect Tracking Transactions on Antennas And Propagation Vol. 52, No. 11, (November 2004): 2825-2832.

Pozar, David M. Microwave Engineering Willey 2005