Design and Development of an Amplitude Leveling Subsystem for FM Radars
To better understand contributions of large ice sheets to sea level rise, remote sensing radars are used to measure relevant characteristics. The Center for Remote Sensing of Ice Sheets (CReSIS) at the University of Kansas has been developing ultra wideband radars to measure the surface elevation of...
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/6276 2023-05-15T15:53:44+02:00 Design and Development of an Amplitude Leveling Subsystem for FM Radars Owen, Heather Gogineni, Prasad Allen, Christopher Seguin, Sarah 2010 72 pages http://hdl.handle.net/1808/6276 http://dissertations.umi.com/ku:10746 EN eng University of Kansas http://dissertations.umi.com/ku:10746 http://hdl.handle.net/1808/6276 This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess Electronics and electrical engineering Amplitude Control Fmcw Gain Radar Thesis 2010 ftunivkansas 2022-08-26T13:10:31Z To better understand contributions of large ice sheets to sea level rise, remote sensing radars are used to measure relevant characteristics. The Center for Remote Sensing of Ice Sheets (CReSIS) at the University of Kansas has been developing ultra wideband radars to measure the surface elevation of polar ice sheets, near-surface internal layers in polar firn, and thickness of snow cover on sea ice. There is a need for an amplitude leveling subsystem for these radars to achieve constant transmit power since amplitude distortions degrade range sidelobe performance of these radars. A closed-loop amplitude leveling subsystem for frequency-modulated radars is designed, constructed and tested. This system uses a coupler and power detector to sample transmit power and feedback a control voltage to a variable-gain amplifier that controls the amplitude of the transmit signal. The closed-loop system is able to decrease amplitude variation to ±0.72 dB. Results are presented, and sources of error are analyzed for this system. Measurements of required control voltage versus frequency are presented for an open-loop system that does not use the coupler or power detector. These two systems are compared, and recommendations are given for future work. Thesis Center for Remote Sensing of Ice Sheets (CReSIS) Sea ice The University of Kansas: KU ScholarWorks |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
English |
topic |
Electronics and electrical engineering Amplitude Control Fmcw Gain Radar |
spellingShingle |
Electronics and electrical engineering Amplitude Control Fmcw Gain Radar Owen, Heather Design and Development of an Amplitude Leveling Subsystem for FM Radars |
topic_facet |
Electronics and electrical engineering Amplitude Control Fmcw Gain Radar |
description |
To better understand contributions of large ice sheets to sea level rise, remote sensing radars are used to measure relevant characteristics. The Center for Remote Sensing of Ice Sheets (CReSIS) at the University of Kansas has been developing ultra wideband radars to measure the surface elevation of polar ice sheets, near-surface internal layers in polar firn, and thickness of snow cover on sea ice. There is a need for an amplitude leveling subsystem for these radars to achieve constant transmit power since amplitude distortions degrade range sidelobe performance of these radars. A closed-loop amplitude leveling subsystem for frequency-modulated radars is designed, constructed and tested. This system uses a coupler and power detector to sample transmit power and feedback a control voltage to a variable-gain amplifier that controls the amplitude of the transmit signal. The closed-loop system is able to decrease amplitude variation to ±0.72 dB. Results are presented, and sources of error are analyzed for this system. Measurements of required control voltage versus frequency are presented for an open-loop system that does not use the coupler or power detector. These two systems are compared, and recommendations are given for future work. |
author2 |
Gogineni, Prasad Allen, Christopher Seguin, Sarah |
format |
Thesis |
author |
Owen, Heather |
author_facet |
Owen, Heather |
author_sort |
Owen, Heather |
title |
Design and Development of an Amplitude Leveling Subsystem for FM Radars |
title_short |
Design and Development of an Amplitude Leveling Subsystem for FM Radars |
title_full |
Design and Development of an Amplitude Leveling Subsystem for FM Radars |
title_fullStr |
Design and Development of an Amplitude Leveling Subsystem for FM Radars |
title_full_unstemmed |
Design and Development of an Amplitude Leveling Subsystem for FM Radars |
title_sort |
design and development of an amplitude leveling subsystem for fm radars |
publisher |
University of Kansas |
publishDate |
2010 |
url |
http://hdl.handle.net/1808/6276 http://dissertations.umi.com/ku:10746 |
genre |
Center for Remote Sensing of Ice Sheets (CReSIS) Sea ice |
genre_facet |
Center for Remote Sensing of Ice Sheets (CReSIS) Sea ice |
op_relation |
http://dissertations.umi.com/ku:10746 http://hdl.handle.net/1808/6276 |
op_rights |
This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess |
_version_ |
1766388930539683840 |