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CST User Group Meeting 2010

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Antenna design for the

detection of alive buried

victims under thick layers ofrubble.

JM FLOC’H

JM DENOUAL

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Outline

• The project

• The partnerships

• Goals• CST simulation

• Measurements

• First results

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VIPERE Project(Vision des PERsonnes Ensevelies)

• Project financed by ANR beginning in 2007, endin august 2010

• Goals : Detection of buried persons with RADAR

techniques

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parternship

• CEA for antenna test

• CISTEM / XLIM for radioelectric

experimental and simulation data

• ETSA for Electronics

• IETR for antenna design

• MARTEC for leadership, integration andtreatments

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Goals (1)

- Propagation in inhomogeneous structure

High attenuation

Multiple traject, diffraction

- Detection of people with very low mobility

- Doppler treatement

- Imaging in 3D

- Light and compact system

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Goals (2)

• Radar scope 2 to 30 m

• Distance resolution 15 to 50 cm

• Maximum sensibility -150 to -165 dBm

• Respiration amplitude few mm to 2 cm• Respiration frequency 0.1 to 0.5 Hz

• Radar UWB CW with phase coding

•Frequency repetition 100 Hz

• Code length 2*23

• Treatement gain 69 dB

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Radar schematic

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VIPERE Antenna (2)

• Symetric structure (2 flares)

• Damping resistance at the endof the flares

• Shape optimization

•Direct interface with emission andtransmission modules

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CST Simulation

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 Antenna prototype

Size : 35 x 23 x 15 cm Weight : 1.1 Kg

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CEA Measurement System

Reference Antennawith H and V polarisation

VIPERE

 Antenna

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Reflection coefficient

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Radiation pattern(measurement and simulation in H and V polarisation)

300 MHz

2 GHz

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 Antenna Gain

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Polarization decoupling

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Impulse response (1)(simulation and measurement in azimut and elevation)

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Impulse response (2)

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Impulse response (3)

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Impulse response (4)Elevation

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Impulse response (4)Elevation

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 Antenna Coupling Simulation (1)

Distance center to center 

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 Antenna Coupling Simulation (2)

Distance center to center 

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 Antenna Coupling Simulation (3)

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 Antenna Coupling Measurements (2)

Horizontal

Vertical

Distance :

15 cm

30 cm

45 cm

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Radar Prototype

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Measurement exempleRespiration measured spectra

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Thank you for your attention