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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 11, 581-592, 2018
https://doi.org/10.5194/amt-11-581-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
31 Jan 2018
High-range resolution spectral analysis of precipitation through range imaging of the Chung-Li VHF radar
Shih-Chiao Tsai1,3, Jenn-Shyong Chen2, Yen-Hsyang Chu3, Ching-Lun Su3, and Jui-Hsiang Chen3 1Department of Environmental Information and Engineering, National Defense University, Taoyuan, Taiwan
2Center for General Education, China Medical University, Taichung, Taiwan
3Graduate Institute of Space Science, National Central University, Taoyuan, Taiwan
Abstract. Multi-frequency range imaging (RIM) has been operated in the Chung-Li very high-frequency (VHF) radar, located on the campus of National Central University, Taiwan, since 2008. RIM processes the echo signals with a group of closely spaced transmitting frequencies through appropriate inversion methods to obtain high-resolution distribution of echo power in the range direction. This is beneficial to the investigation of the small-scale structure embedded in dynamic atmosphere. Five transmitting frequencies were employed in the radar experiment for observation of the precipitating atmosphere during the period between 21 and 23 August 2013. Using the Capon and Fourier methods, the radar echoes were synthesized to retrieve the temporal signals at a smaller range step than the original range resolution defined by the pulse width, and such retrieved temporal signals were then processed in the Doppler frequency domain to identify the atmosphere and precipitation echoes. An analysis called conditional averaging was further executed for echo power, Doppler velocity, and spectral width to verify the potential capabilities of the retrieval processing in resolving small-scale precipitation and atmosphere structures. Point-by-point correction of range delay combined with compensation of range-weighting function effect has been performed during the retrieval of temporal signals to improve the continuity of power spectra at gate boundaries, making the small-scale structures in the power spectra more natural and reasonable. We examined stratiform and convective precipitation and demonstrated their different structured characteristics by means of the Capon-processed results. The new element in this study is the implementation of RIM on spectral analysis, especially for precipitation echoes.

Citation: Tsai, S.-C., Chen, J.-S., Chu, Y.-H., Su, C.-L., and Chen, J.-H.: High-range resolution spectral analysis of precipitation through range imaging of the Chung-Li VHF radar, Atmos. Meas. Tech., 11, 581-592, https://doi.org/10.5194/amt-11-581-2018, 2018.
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Short summary
This research makes an application of the multifrequency technique (RIM) to the spectral analysis (frequency domain) for both atmospheric and precipitation, especially for precipitation echoes. Various precipitation conditions such as stratiform and convective precipitations were investigated with RIM for the first time. The effectiveness and potential capabilities of RIM in resolving small-scale precipitation and atmosphere structures have been verified by conditional averaging analysis.
This research makes an application of the multifrequency technique (RIM) to the spectral...
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