ISRO is inviting viewers for its Webinar Series on SAR Data Processing on 7-28 May 2021.
The Webinar builds upon this Initiative in an effort to increase the capacity of institutions in less developed countries for effective use of Earth Observation data for the benefit of society and to achieve sustainable development.
The overall objective of the Webinar is building capacity for the effective use of Earth Observation data as well as providing wider and easier access to those data. It aims to unify CEOS efforts toward:
- Providing wider and easier access to Earth Observation data
- Increasing the sharing of software tools such as the use of open source software and open systems interface
- Increasing data dissemination capabilities and transferring relevant technologies to end users
- Providing intensive capacity building, education, and training (including awareness and outreach) for enabling end users to gather the information they need and for increasing communication on achieved results
Basic Knowledge of Remote Sensing and Digital Image Processing.
Academician, scientists, researchers and professionals working in the area of microwave Remote Sensing.
- Dates: May 7 to 28
- Time: 6.30 PM IST
- Certification: Provided
- May 7 2021 at 6.30 PM IST: SAR Remote Sensing Concepts: SAR Geometry, Imaging modes, SAR resolution, Geometric Distortions, layover, Shadow, Foreshortening, SAR Image Properties and interpretation.
- May 13 2021 at 6.30 PM IST: SAR Data Processing -I : SAR Data Processing concepts, Pulse Compression technique, Synthetic Aperture Concept , Range Cell Migration (RCM), Range Doppler algorithm.
- May 21 at 6.30 PM IST: SAR Data Processing -II: SAR Geometric and Radiometric Correction Techniques, Geolocation, Geocoding, Orthorectification, Speckle Filters.
- May 28 at 6.30 PM IST: SAR Interferometry: Interferogram generation, Baseline concepts, across track and along track Interferometry configurations.
Remote sensing is a technique to observe the various features on the earth’s surface using satellites or aircraft. With the advancement of space borne sensors, remote sensing has become an effective method for the detection of various features on the earth’s surface. Optical Infrared (OIR) remote sensing is mainly used to image the earth’s surface using the OIR sensor.
However, OIR sensors are limited by the availability of sunlight and interference of the atmospheric conditions such as haze and cloud cover. Therefore, the use of microwave or radar remote sensing is much useful for imaging the earth’s surface. Radar imaging through Synthetic Aperture Radar (SAR) systems has expanded the technology of Microwave remote sensing in various applications.
To understand the SAR imagery, the physics phenomenon behind the interaction of the electromagnetic wave with the earth’s surface features needs to be understood. SAR data processing is also different from optical data processing as it involves many signal-processing techniques. The SAR data processing uses the pulse compression techniques, Linear Frequency Modulation (LFM) concepts, Range & Doppler information, and various other SAR parameters.
The Range-Doppler algorithm (RDA) is a common technique to focus the SAR data. Since SAR is a ranging instrument, geometric distortions are more prevalent in SAR Image as compare to the optical image. Thus, geometric corrections need to be done using SAR geolocation, geocoding, and orthorectification techniques. SAR geolocation is also very much different from optical sensors as it uses the range and Doppler equations to geolocate the target.
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