Characterizing a Ka-Band FMCW Reflectometer
A Ka-Band ultra-fast, ultra-wide band Frequency Modulated Continuous Wave (FMCW) reflectometer to measure the plasma density profile has been designed and developed at Institute for Plasma Research (IPR). We present here the need for ultra-fast and ultra-wide frequency of operation and estimate expe...
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| Veröffentlicht in: | Journal of instrumentation 2023-07, Vol.18 (7), p.P07022 |
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| creator | Buch, J.J.U. Pathak, S.K. |
| description | A Ka-Band ultra-fast, ultra-wide band Frequency Modulated Continuous Wave (FMCW) reflectometer to measure the plasma density profile has been designed and developed at Institute for Plasma Research (IPR). We present here the need for ultra-fast and ultra-wide frequency of operation and estimate expected beat frequencies for the instrument. Three distinct corrections are made to the obtained frequencies. Firstly, inherent non-linearity of the frequency source is removed by shifting non-linearity to the tuning voltage of the hyper-abrupt varactor tuned oscillator and then correcting mismatch of the absolute values of frequency by introducing a delay line to account for the
difference in length between active and reference paths
for producing the beat frequencies. Using code developed based on the short time Fourier transform we extract the beat frequency to measure various known distances and verify with our beat frequency estimations and also show that range resolution obtained is very close to the theoretical one obtained. |
| doi_str_mv | 10.1088/1748-0221/18/07/P07022 |
| format | Article |
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difference in length between active and reference paths
for producing the beat frequencies. Using code developed based on the short time Fourier transform we extract the beat frequency to measure various known distances and verify with our beat frequency estimations and also show that range resolution obtained is very close to the theoretical one obtained.</description><identifier>ISSN: 1748-0221</identifier><identifier>EISSN: 1748-0221</identifier><identifier>DOI: 10.1088/1748-0221/18/07/P07022</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Beat frequencies ; Continuous radiation ; Delay lines ; Extremely high frequencies ; Fourier transforms ; Nonlinearity ; Nuclear instruments and methods for hot plasma diagnostics ; Plasma density ; Plasma diagnostics - interferometry, spectroscopy and imaging ; Reflectometers</subject><ispartof>Journal of instrumentation, 2023-07, Vol.18 (7), p.P07022</ispartof><rights>2023 IOP Publishing Ltd and Sissa Medialab</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c361t-ba4959a1054a82291cf242c8e5c579889665091965cbd7871205972a8bbb305b3</citedby><cites>FETCH-LOGICAL-c361t-ba4959a1054a82291cf242c8e5c579889665091965cbd7871205972a8bbb305b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/1748-0221/18/07/P07022/pdf$$EPDF$$P50$$Giop$$H</linktopdf><link.rule.ids>314,776,780,27901,27902,53821,53868</link.rule.ids></links><search><creatorcontrib>Buch, J.J.U.</creatorcontrib><creatorcontrib>Pathak, S.K.</creatorcontrib><title>Characterizing a Ka-Band FMCW Reflectometer</title><title>Journal of instrumentation</title><addtitle>J. Instrum</addtitle><description>A Ka-Band ultra-fast, ultra-wide band Frequency Modulated Continuous Wave (FMCW) reflectometer to measure the plasma density profile has been designed and developed at Institute for Plasma Research (IPR). We present here the need for ultra-fast and ultra-wide frequency of operation and estimate expected beat frequencies for the instrument. Three distinct corrections are made to the obtained frequencies. Firstly, inherent non-linearity of the frequency source is removed by shifting non-linearity to the tuning voltage of the hyper-abrupt varactor tuned oscillator and then correcting mismatch of the absolute values of frequency by introducing a delay line to account for the
difference in length between active and reference paths
for producing the beat frequencies. Using code developed based on the short time Fourier transform we extract the beat frequency to measure various known distances and verify with our beat frequency estimations and also show that range resolution obtained is very close to the theoretical one obtained.</description><subject>Beat frequencies</subject><subject>Continuous radiation</subject><subject>Delay lines</subject><subject>Extremely high frequencies</subject><subject>Fourier transforms</subject><subject>Nonlinearity</subject><subject>Nuclear instruments and methods for hot plasma diagnostics</subject><subject>Plasma density</subject><subject>Plasma diagnostics - interferometry, spectroscopy and imaging</subject><subject>Reflectometers</subject><issn>1748-0221</issn><issn>1748-0221</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNqFkE1LxDAQhoMouK7-BSl4U2ozafN11LKr4ooiiseQpql22W1r0j3orzelonsQPM0M88z7zgxCx4DPAQuRAM9EjAmBBESCefKAeah20OSnsbuV76MD75cYU0kzPEFn-Zt22vTW1Z918xrp6FbHl7opo_ld_hI92mplTd-ubSAO0V6lV94efccpep7PnvLreHF_dZNfLGKTMujjQmeSSg2YZloQIsFUJCNGWGool0JIxiiWIBk1RckFBxKW4USLoihSTIt0ik5G3c617xvre7VsN64JloqIlMqgwWSg2EgZ13rvbKU6V6-1-1CA1fAYNdyshpsVhMjV-JgweDoO1m33q7ysm2C0DaqurAJM_oD_cfgCV_dvrg</recordid><startdate>20230701</startdate><enddate>20230701</enddate><creator>Buch, J.J.U.</creator><creator>Pathak, S.K.</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20230701</creationdate><title>Characterizing a Ka-Band FMCW Reflectometer</title><author>Buch, J.J.U. ; Pathak, S.K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c361t-ba4959a1054a82291cf242c8e5c579889665091965cbd7871205972a8bbb305b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Beat frequencies</topic><topic>Continuous radiation</topic><topic>Delay lines</topic><topic>Extremely high frequencies</topic><topic>Fourier transforms</topic><topic>Nonlinearity</topic><topic>Nuclear instruments and methods for hot plasma diagnostics</topic><topic>Plasma density</topic><topic>Plasma diagnostics - interferometry, spectroscopy and imaging</topic><topic>Reflectometers</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Buch, J.J.U.</creatorcontrib><creatorcontrib>Pathak, S.K.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of instrumentation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Buch, J.J.U.</au><au>Pathak, S.K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterizing a Ka-Band FMCW Reflectometer</atitle><jtitle>Journal of instrumentation</jtitle><addtitle>J. Instrum</addtitle><date>2023-07-01</date><risdate>2023</risdate><volume>18</volume><issue>7</issue><spage>P07022</spage><pages>P07022-</pages><issn>1748-0221</issn><eissn>1748-0221</eissn><abstract>A Ka-Band ultra-fast, ultra-wide band Frequency Modulated Continuous Wave (FMCW) reflectometer to measure the plasma density profile has been designed and developed at Institute for Plasma Research (IPR). We present here the need for ultra-fast and ultra-wide frequency of operation and estimate expected beat frequencies for the instrument. Three distinct corrections are made to the obtained frequencies. Firstly, inherent non-linearity of the frequency source is removed by shifting non-linearity to the tuning voltage of the hyper-abrupt varactor tuned oscillator and then correcting mismatch of the absolute values of frequency by introducing a delay line to account for the
difference in length between active and reference paths
for producing the beat frequencies. Using code developed based on the short time Fourier transform we extract the beat frequency to measure various known distances and verify with our beat frequency estimations and also show that range resolution obtained is very close to the theoretical one obtained.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1748-0221/18/07/P07022</doi><tpages>15</tpages></addata></record> |
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| identifier | ISSN: 1748-0221 |
| ispartof | Journal of instrumentation, 2023-07, Vol.18 (7), p.P07022 |
| issn | 1748-0221 1748-0221 |
| language | eng |
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| source | Institute of Physics Journals |
| subjects | Beat frequencies Continuous radiation Delay lines Extremely high frequencies Fourier transforms Nonlinearity Nuclear instruments and methods for hot plasma diagnostics Plasma density Plasma diagnostics - interferometry, spectroscopy and imaging Reflectometers |
| title | Characterizing a Ka-Band FMCW Reflectometer |
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