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7/27/2019 323_tech Sem Slides
1/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [1]
TECHNICAL SEMINAR PRESENTATION 2011
PRESENTED BY
RUCHISMITA MAHANATA Roll # 200750323 (ECE)
Under the guidance of
Mr. Hari Krushna Gantayat
NATIONAL INSTITUTE OF SCIENCE & TECHNOLOGYBERHAMPUR,ORISSA
Synthetic Aperture Radar
7/27/2019 323_tech Sem Slides
2/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [2]
TECHNICAL SEMINAR PRESENTATION 2011
Flow Of Discussion
Principles of Radar
Whats SAR?
How does SAR work?
SAR : A type of Imaging Radar
Advantages and Disadvantages
Applications
Conclusion
References
7/27/2019 323_tech Sem Slides
3/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [3]
TECHNICAL SEMINAR PRESENTATION 2011
PRINCIPLES OF RADAR: HOW DOES RADAR WORK?
RADAR = Radio Detection And Ranging
Since radar pulses propagate at the speed of light, the difference to the target
is proportional to the time it takes between the transmit event and reception of
the radar echo.
TRANSMITTER
RECEIVER
CIRCULATOR
RADAR PULSE
"TARGET"
7/27/2019 323_tech Sem Slides
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N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [4]
TECHNICAL SEMINAR PRESENTATION 2011
Whats SAR ?
Synthetic Aperture Radar is a space or airborne
technology that provides high-resolution monitoring for
environmental and military purposes in all weather or
day/night conditions
With SAR it is possible to obtain detailed information
quickly that may be of great use in combating such natural
disasters as wildfires, oil spills, ice and seas, etc.
7/27/2019 323_tech Sem Slides
5/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [5]
TECHNICAL SEMINAR PRESENTATION 2011
How Does SAR Work?
Details are complex, but in a simplified version, we can say
that SAR operates by sending out energy pulses at
microwave wavelengths and measuring the precise time of
the returning echo from a surface
What makes SAR different is that it creates an extremely
sharp beam over a wide area that enables high-resolution
imaging
The next slide represents the process.
7/27/2019 323_tech Sem Slides
6/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [6]
TECHNICAL SEMINAR PRESENTATION 2011
How Does SAR Work?
7/27/2019 323_tech Sem Slides
7/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [7]
TECHNICAL SEMINAR PRESENTATION 2011
SAR is one type of imaging radar
7/27/2019 323_tech Sem Slides
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N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [8]
TECHNICAL SEMINAR PRESENTATION 2011
SAR is one type of imaging radar
Imaging radars produce an image in the flight direction and
for a distance on one side of the flight path
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7/27/2019 323_tech Sem Slides
10/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [10]
TECHNICAL SEMINAR PRESENTATION 2011
ADVANTAGES AND DISADVANTAGES
ADVANTAGES:
Operational under all weather conditions with the
capabilities for sensing the earth day and night.
Provides description of surface texture.
Has own source of illumination
Cloud and fog cover are not a problem.
Vegetation and subsurface penetration capabilities.
7/27/2019 323_tech Sem Slides
11/16
N
ational
Instit
ute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [11]
TECHNICAL SEMINAR PRESENTATION 2011
ADVANTAGES AND DISADVANTAGES
DISADVANTAGES:
Image distortion Coarse resolution
Extensive shadowing of areas characterised with relief.
7/27/2019 323_tech Sem Slides
12/16
N
ational
Institute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [12]
TECHNICAL SEMINAR PRESENTATION 2011
APPLICATIONS
SAR Systems has a wide range of applications such as:
Reconnaissance, Surveillance, and Targeting
Treaty Verification and Nonproliferation
Interferometry (3-D SAR)
Navigation and Guidance
Foliage and Ground Penetration
Moving Target Indication
Change Detection
Environmental Monitoring
http://en.wikipedia.org/wiki/File:Death-valley-sar.jpg7/27/2019 323_tech Sem Slides
13/16
N
ational
Institute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [13]
TECHNICAL SEMINAR PRESENTATION 2011
Conclusion
Synthetic Aperture Radar is now a well established part of radar art, both withairborne systems for surveillance and non-cooperative target identification
purposes, and with space-borne systems for geophysical remote sensing
applications over the oceans, land and polar regions. The capability to operate
under all weather conditions make it an efficient sensor.
http://en.wikipedia.org/wiki/File:Venus_globe.jpg7/27/2019 323_tech Sem Slides
14/16
N
ational
Institute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [14]
TECHNICAL SEMINAR PRESENTATION 2011
References.
Skolnik, M. I., Radar Handbook, McGraw-Hill, New York, 1970.
Curlander, J. C. and R. N. McDounough, Synthetic Aperture Radar, Systems
and Signal Processing, John Wiley & Sons, New York, 1991
http://en.wikipedia.org/wiki/Synthetic_aperture_radar
http://www.radartutorial.eu/20.airborne/ab07.en.html
http://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radarhttp://en.wikipedia.org/wiki/Synthetic_aperture_radar7/27/2019 323_tech Sem Slides
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N
ational
Institute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [15]
TECHNICAL SEMINAR PRESENTATION 2011
Questions?
Suggestions?Other Remarks?
7/27/2019 323_tech Sem Slides
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N
ational
Institute
of
Scienc
e
and
Techno
logy
PRESENTED BY: Ruchismita Mahanta [16]
TECHNICAL SEMINAR PRESENTATION 2011