eTheses Repository

Measuring and modelling the impact of the ionosphere on space based synthetic aperture radars

Mannix, Christopher Robert (2016)
Ph.D. thesis, University of Birmingham.

PDF (16Mb)Accepted Version


Synthetic aperture radar (SAR) is a technique widely used in applications that require all-weather imaging. The ionosphere affects the operation of these radars, with those operating at L-band (1-2 GHz) and below at risk of being seriously compromised by the ionosphere. A method of using Global Positioning System (GPS) data to synthesize the impact of the ionosphere on SAR systems has been presented. The technique was used to assess the viability of using a signal phase correction derived from a reference location in a SAR image to correct ionospheric effects across the image. A dataset of SAR images and GPS measurements collected simultaneously on Ascension Island were used to test two techniques for deriving ionospheric strength of turbulence (C\(_k\)L) from SAR images – one using measurements of trihedral corner reflectors (CR) and the other measurements of natural clutter. The CR C\(_k\)L values showed a correlation of 0.69 with GPS estimates of C\(_k\)L, whilst the clutter measurements showed a correlation of up to 0.91 with the CR values. Finally, a study of using the effects of intensity scintillation on SAR images to measure the S\(_4\) index was performed. The study was not able to reproduce previous results, but produced significant practical conclusions.

Type of Work:Ph.D. thesis.
Supervisor(s):Cannon, Paul S.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Engineering, Department of Electronic, Electrical and Systems Engineering
Additional Information:

Publication arising from thesis:

Mannix, C. R., D. P. Belcher, P. S. Cannon, and M. J. Angling (2016), Using GNSS signals as a proxy for SAR signals: Correcting ionospheric defocusing, Radio Sci., 51, 60–70.

Keywords:SAR, Synthetic Aperture Radar, Ionosphere, GNSS, Space Weather, GPS, Scintillation, Radar
Subjects:QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
ID Code:6869
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
Export Reference As : ASCII + BibTeX + Dublin Core + EndNote + HTML + METS + MODS + OpenURL Object + Reference Manager + Refer + RefWorks
Share this item :
QR Code for this page

Repository Staff Only: item control page