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GPR Modeling-Landmine

Detection

Presented by,Arun VargheseS7 EC ARoll No.:22

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Objectives

Introduction

GPR

Hardware Description

The antenna model

Advantages

Conclusion

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INTRODUCTION

Landmines method of warfare

Landmines container of explosives thatare triggered by contact with a person orvehicles.

2 types anti-tank & anti-personal

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Depth range of GPR is limited bythe electrical conductivity of the ground,the transmitted center frequency , the

radiated power.

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Hardware Description

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Impulse Generator

The pulse generator produces 0.8 nsmonocycle pulses.

Experimentally found that the 0.8nsmonocycle satisfies penetration andresolution requirements.

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Antenna System

The GPR Systems performance strongly

depends on the antenna system.

The antenna system consist of transmitterand receiver.

The transmit antenna should:

Radiate ultra-wide band (UWB).

Radiate electro magnetic energy.

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The Receiver antenna should:

High sensitivity in order to receive very weak

fields. Receive the field in a local point.

Be elevated at least 10cm above the groundsurface.

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Pulse Extender

Pulse extender will amplify the ground reflection.

A/D Converter

TXr RXr High speed sampler A/D converter.

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PROCESSOR

A/D converter Processor.

Processes the signal.

Presence or absence of surrogate mine.

Mine detecting signal Visual display.

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Visual Display

Range of targets. Exact position.

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Shows target at 55 cm and 100 cm.

Graph helps to calculate the distance from ground tomine.

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THE ANTENNA MODEL

Represented by a simple source such as adipole or an infinite wire.

Consists of 2 identical bowtie antennasplaced side-by-side

disposition of the bowties inside theantenna unit crosstalk

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Advantages

Has accurate measurements.

Locates even small targets.

Biological sensors can only operate forlimited periods, but in GPR has no such limits

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Disadvantages

The sensor such as GPR is larger andheavier.

GPR is more power hungry.

GPR can be very effective or ineffective,depending on soil moisture

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CONCLUSION

GPR system can be used for detectinganti-tank and anti-personal mines.

Can used by military agents for effective

demining

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THANK YOU