Koherentna parametryczna technika autoogniskowania obrazów radarowych z syntetyczną aperturą

Piotr Jerzy Samczyński

Abstract

In this thesis, the novel coherent parametric autofocus technique for Synthetic Aperture Radar (SAR) applications is presented. SAR radars are advanced sensors designed for creating high resolution images of the Earth surface. Unfortunately, the SAR technique is very sensitive to small errors due to the radar platform movement. Modern aircraft navigation devices are not sufficiently accurate to provide precise information on flight parameters. To produce high resolution SAR images, autofocus techniques have to be employed. Most of the known autofocus techniques are based on iterative algorithms which required high computational power. Moreover, most of these techniques require prominent scatterers (e.g. man-made targets) for properly focused images to be obtained. The objective of this dissertation was to develop a new non-iterative autofocus technique. The method presented in the thesis is a parametric one, which is based on the complex cross-correlation of SAR subimages. This technique permits high resolution SAR images to be obtained, even in a low-contrast and homogenous scene (e.g. meadows, fields, forests etc.), for which other well known autofocus techniques fail. In this thesis, the analysis of SAR processing using the autofocus MapDrift technique based on non-coherent and coherent cross-correlation of SAR subimages has been presented. As a result of this analysis the final estimator of the velocity focusing parameter for the non-iterative coherent MapDrift technique has been obtained. The theoretical results have been verified by computer simulations. The results of simulation experiments agree with the corresponding theoretical analysis. The results of the processing of real-life signals obtained by the first Polish SAR radar developed by Przemysłowy Instytut Telekomunikacji S.A. in cooperation with the Institute of Electronic Systems, Warsaw University of Technology, are demonstrated in this thesis. The author has made a significant contribution towards the development of the SAR radar and has made a unique contribution towards the data processing, the results of which are documented in this work.
Diploma typeDoctor of Philosophy
Author Piotr Jerzy Samczyński (FEIT / PE)
Piotr Jerzy Samczyński,,
- The Institute of Electronic Systems
Title in PolishKoherentna parametryczna technika autoogniskowania obrazów radarowych z syntetyczną aperturą
Languagepl polski
Certifying UnitFaculty of Electronics and Information Technology (FEIT)
Disciplinetelecommunications / (technology domain) / (technological sciences)
Start date23-09-2008
Defense Date14-09-2010
End date10-11-2010
Supervisor Krzysztof Kulpa (FEIT / PE)
Krzysztof Kulpa,,
- The Institute of Electronic Systems

Internal reviewers Yevhen Yashchyshyn (FEIT / RE)
Yevhen Yashchyshyn,,
- The Institute of Radioelectronics
External reviewers Jerzy Kapelewski
Jerzy Kapelewski,,
-
Honoredyes
Pages116
Keywords in EnglishSynthetic Aperture Radar (SAR)
Abstract in EnglishIn this thesis, the novel coherent parametric autofocus technique for Synthetic Aperture Radar (SAR) applications is presented. SAR radars are advanced sensors designed for creating high resolution images of the Earth surface. Unfortunately, the SAR technique is very sensitive to small errors due to the radar platform movement. Modern aircraft navigation devices are not sufficiently accurate to provide precise information on flight parameters. To produce high resolution SAR images, autofocus techniques have to be employed. Most of the known autofocus techniques are based on iterative algorithms which required high computational power. Moreover, most of these techniques require prominent scatterers (e.g. man-made targets) for properly focused images to be obtained. The objective of this dissertation was to develop a new non-iterative autofocus technique. The method presented in the thesis is a parametric one, which is based on the complex cross-correlation of SAR subimages. This technique permits high resolution SAR images to be obtained, even in a low-contrast and homogenous scene (e.g. meadows, fields, forests etc.), for which other well known autofocus techniques fail. In this thesis, the analysis of SAR processing using the autofocus MapDrift technique based on non-coherent and coherent cross-correlation of SAR subimages has been presented. As a result of this analysis the final estimator of the velocity focusing parameter for the non-iterative coherent MapDrift technique has been obtained. The theoretical results have been verified by computer simulations. The results of simulation experiments agree with the corresponding theoretical analysis. The results of the processing of real-life signals obtained by the first Polish SAR radar developed by Przemysłowy Instytut Telekomunikacji S.A. in cooperation with the Institute of Electronic Systems, Warsaw University of Technology, are demonstrated in this thesis. The author has made a significant contribution towards the development of the SAR radar and has made a unique contribution towards the data processing, the results of which are documented in this work.
Thesis file
doktorat Samczyński.pdf 24.25 MB
Citation count*1 (2020-09-18)

Get link to the record

Back
Confirmation
Are you sure?