Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications
We report on a Fast Fourier Transform Spectrometer (FFTS) that provides larger bandwidth by fast local oscillator switching of the base-band converter. We demonstrate that this frequency scanning technique is suited for atmospheric remote sensing and conduct measurements of atmospheric ozone using t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-05-01
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| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/11/5/490 |
| _version_ | 1797568306374246400 |
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| author | Jonas Hagen Andres Luder Axel Murk Niklaus Kämpfer |
| author_facet | Jonas Hagen Andres Luder Axel Murk Niklaus Kämpfer |
| author_sort | Jonas Hagen |
| collection | DOAJ |
| description | We report on a Fast Fourier Transform Spectrometer (FFTS) that provides larger bandwidth by fast local oscillator switching of the base-band converter. We demonstrate that this frequency scanning technique is suited for atmospheric remote sensing and conduct measurements of atmospheric ozone using the WIRA-C (WInd RAdiometer for Campaigns) Doppler wind radiometer. The comparison of our measurements to an adjusted atmospheric and instrumental model exposes no systematic biases due to the switching procedure in the measured spectra. It further shows that the combination of high spectral resolution with large bandwidth yields good measurement response to stratospheric and mesospheric ozone from approximately a 20 km to 70 km altitude with a resolution of 7 km in the lower stratosphere to 20 km in the mesosphere. We conclude that low-cost, low-power software-defined radio hardware designed for communications applications is very well suited for a variety of spectroscopic applications, including ozone monitoring. This allows the design of low-cost, multi-purpose instruments for atmospheric remote sensing and thus has a direct impact on future radiometer developments and their adoption in remote sensing campaigns and networks. |
| first_indexed | 2024-03-10T19:55:35Z |
| format | Article |
| id | doaj.art-7ebfdbc28da84ba492b78bb32ab3a856 |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T19:55:35Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-7ebfdbc28da84ba492b78bb32ab3a8562023-11-20T00:00:59ZengMDPI AGAtmosphere2073-44332020-05-0111549010.3390/atmos11050490Frequency-Agile FFT Spectrometer for Microwave Remote Sensing ApplicationsJonas Hagen0Andres Luder1Axel Murk2Niklaus Kämpfer3Institute of Applied Physics, University of Bern, 3012 Bern, SwitzerlandInstitute of Applied Physics, University of Bern, 3012 Bern, SwitzerlandInstitute of Applied Physics, University of Bern, 3012 Bern, SwitzerlandInstitute of Applied Physics, University of Bern, 3012 Bern, SwitzerlandWe report on a Fast Fourier Transform Spectrometer (FFTS) that provides larger bandwidth by fast local oscillator switching of the base-band converter. We demonstrate that this frequency scanning technique is suited for atmospheric remote sensing and conduct measurements of atmospheric ozone using the WIRA-C (WInd RAdiometer for Campaigns) Doppler wind radiometer. The comparison of our measurements to an adjusted atmospheric and instrumental model exposes no systematic biases due to the switching procedure in the measured spectra. It further shows that the combination of high spectral resolution with large bandwidth yields good measurement response to stratospheric and mesospheric ozone from approximately a 20 km to 70 km altitude with a resolution of 7 km in the lower stratosphere to 20 km in the mesosphere. We conclude that low-cost, low-power software-defined radio hardware designed for communications applications is very well suited for a variety of spectroscopic applications, including ozone monitoring. This allows the design of low-cost, multi-purpose instruments for atmospheric remote sensing and thus has a direct impact on future radiometer developments and their adoption in remote sensing campaigns and networks.https://www.mdpi.com/2073-4433/11/5/490radiometryremote sensingFFT spectrometryozone |
| spellingShingle | Jonas Hagen Andres Luder Axel Murk Niklaus Kämpfer Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications Atmosphere radiometry remote sensing FFT spectrometry ozone |
| title | Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications |
| title_full | Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications |
| title_fullStr | Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications |
| title_full_unstemmed | Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications |
| title_short | Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications |
| title_sort | frequency agile fft spectrometer for microwave remote sensing applications |
| topic | radiometry remote sensing FFT spectrometry ozone |
| url | https://www.mdpi.com/2073-4433/11/5/490 |
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