2014-10-16 ATC Design Study UWB Radar System 33
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Transcript of 2014-10-16 ATC Design Study UWB Radar System 33
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The 2014 International Conference on Advanced Technologies for Communications
October 15-17 2014, Ha Noi, Vietnam
Design and Experimental Study of an
Ultra-Wideband Radar System
Manh Ha Hoang
Hong Phuong PhanQuoc Huy Dien
Duc Lam Nguyen
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Outline
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Introduction
Antennas design
Experimental study of the UWB Radar System
Discussion
Conclusion
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Introduction
Ground Penetrating Radar is used as non-destructive
testing method.
GPRs have many applications in our life
testing structural concrete in civil engineering
emergency rescue
mine detection in military
detection of historical objects in archeology underground storage tank investigation, etc.
UWB is an attractive choice for GPR technology
high speed
high resolution Commercial GPR systems with very high prices
A whole hardware and software of the UWB radar system
has implemented at HCMC University.
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Antennas design (1/2)
Frequency band 1 9 GHz
Vivaldi antennas are suitable
upper frequency is theoretical
infinity
planar structure
Design is based on Vivaldi curves
theory Curves are smooth and continuous
to reduce the wave reflection
120x120 mm2 dimension antenna
was designed on Teflon substrate
top view bottom view
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Antennas design (2/2)
Slight reflected pulse over the
time
Lower frequency is 0.972 GHz,
and upper one is above 10GHz
The main radiation direction at
6 GHz with directivity of 7.9dBi When two antennas are on the
same plane |S21|
Results
Time response
|S11|
Directivity
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Experimental study of the UWB Radar System (1/7)
Transceiver, two antennas (Fig.1) The transmitter generates pulses with
spectrum spreading approximately 10GHz
(20dB-bandwidth) (Fig.2)
PID controlled two-dimensional
positioning scanner (Fig.3) PC + Software with migration
algorithms
System
0.5m
10GHz,
-60dBm
-40dBm
Fig.1
Fig.2
Fig.3
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Experimental study of the UWB Radar System (2/7)
Received signal is continuousand need to be divided into
periods.
base on the reference signal
Signal is received on PC is not
synchronized to the signal fromRadar and it has jitters
interpolating and re-sampling this
signal base on the reference signal
Vibration effects on the received
signal when changing position ofRadar
stopping scanner for an amount of
time enough for stabilizing and
some periods of signal are selected
to make average ones
Problems
Referencesignal
Coupling betweentwo antennas
a period
Vibration
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Experimental study of the UWB Radar System (3/7)
Use Rada to scan the space at redefined locations, Register received signal and transfer data to PC,
Divide signal into periods base on reference signal,
Select periods at positions the scanner stop,
Make averaged signals and re-sampling these signals base on
the reference signal and averaged period,
Remove environment background data,
Use the migration algorithms Hyperbolic summation (HS),
Kirchhoff migration (KM), Frequency wavenumber migration
(FK), and Phase shift (PS) to recover objects images,
Display the recovered images of the object(s).
Data acquisition and processing process
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Experimental study of the UWB Radar System (4/7)
Two objects under test
are a rectangular box
and a sphere covered by
foil.
Testing has beenperformed to detect one
or two object(s) in the air
and behind the wall.
Testing arrangement 145mm172mm
145mm125mm
Fig.1
330mm
100mm
100mm
320mm
Fig.2
Fig.3
Fig.4
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Experimental study of the UWB Radar System (5/7)
Results (1/3)
a b c
d e
Experiments results with two
objects under test in the air
(a) B-scan
(b) HS algorithm(c) KM algorithm
(d) FK algorithm
(e) PS algorithm
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Experimental study of the UWB Radar System (6/7)
Results (2/3)
a
b c
d eExperiments results with two
objects under test behind the
wall
(a) B-scan(b) HS algorithm
(c) KM algorithm
(d) FK algorithm
(e) PS algorithm
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Experimental study of the UWB Radar System (7/7)
Results (3/3)
Fig.1 Table 1
Fig.2
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Discussion
New results
High sensitivity
Real time response
Applications of UWB
Radar?
detect structural defects in
civil engineering
emergency rescue
2x2cm2
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Conclusion
A partial design and experimental study of an UWB radar
system has been presented.
The Vivaldi antenna has a good performance and is suitable for
UWB radar systems.
The UWB radar system has been tested to detect objects in
some cases, the objects are in the air and behind the wall. Four migration algorithms HS, KM, FK, and PS have been used
to recover objects images.
The advantage of our system is its high resolution/accuracy
and applying this system to detect structural defects in civil
engineering, or the other is very promising.
Th 2014 I t ti l C f Ad d T h l i f C i ti
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The 2014 International Conference on Advanced Technologies for Communications
October 15-17 2014, Ha Noi, Vietnam
THANK YOU FOR YOUR ATTENTION!
QUESTIONS?
Manh Ha Hoang
Design and Experimental Study of an Ultra-Wideband Radar System