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Article

Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications

Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland
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Author to whom correspondence should be addressed.
Atmosphere 2020, 11(5), 490; https://doi.org/10.3390/atmos11050490
Received: 6 April 2020 / Revised: 1 May 2020 / Accepted: 6 May 2020 / Published: 11 May 2020
(This article belongs to the Special Issue Atmospheric Applications in Microwave Radiometry)
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. View Full-Text
Keywords: radiometry; remote sensing; FFT spectrometry; ozone radiometry; remote sensing; FFT spectrometry; ozone
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MDPI and ACS Style

Hagen, J.; Luder, A.; Murk, A.; Kämpfer, N. Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications. Atmosphere 2020, 11, 490. https://doi.org/10.3390/atmos11050490

AMA Style

Hagen J, Luder A, Murk A, Kämpfer N. Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications. Atmosphere. 2020; 11(5):490. https://doi.org/10.3390/atmos11050490

Chicago/Turabian Style

Hagen, Jonas, Andres Luder, Axel Murk, and Niklaus Kämpfer. 2020. "Frequency-Agile FFT Spectrometer for Microwave Remote Sensing Applications" Atmosphere 11, no. 5: 490. https://doi.org/10.3390/atmos11050490

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