Improved Micro Rain Radar snow measurements using Doppler spectra post-processing
Improved Micro Rain Radar snow measurements using Doppler spectra post-processing
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DOI：
10.5194/amt-5-2661-2012
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发表时间：
2012-01-01
影响因子：
3.8
通讯作者：
Kollias, P.
中科院分区：
文献类型：
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作者：
Maahn, M.;Kollias, P.
微雨雷达2号(MRR)是一种紧凑型调频连续波(FMCW)系统，工作频率为24 GHz。MRR是一种低成本的便携式雷达系统，只需在现场进行最低限度的监督。因此，MRR是进行降水研究的常用雷达系统。目前MRR的缺点是缺乏复杂的后处理算法来提高其灵敏度(目前为+3dBz)、与雷达接收机噪声有关的伪影以及缺乏高质量的多普勒雷达矩。这里我们提出了一种改进的处理方法，该方法特别适合于积雪观测，并提供了可靠的有效反射率、多普勒速度和光谱宽度的值。提出的方法可在网上免费获得，其特点是基于最显著峰值的识别来去除噪声。动态去锯齿例程允许即使超出奈奎斯特速度范围也能进行观测。对MRR和35.2 GHz MIRA35云雷达115天的并置观测表明，如果反射率大于-5dBz，则该方法与所提出的降雪方法有很高的一致性。根据量程的不同，总体灵敏度将增加到-14和-8 dBz。建议的方法充分挖掘了MRR硬件的潜力，并大大加强了微雨雷达在固体降水研究中的使用。
The Micro Rain Radar 2 (MRR) is a compact Frequency Modulated Continuous Wave (FMCW) system that operates at 24 GHz. The MRR is a low-cost, portable radar system that requires minimum supervision in the field. As such, the MRR is a frequently used radar system for conducting precipitation research. Current MRR drawbacks are the lack of a sophisticated post-processing algorithm to improve its sensitivity (currently at +3 dBz), spurious artefacts concerning radar receiver noise and the lack of high quality Doppler radar moments. Here we propose an improved processing method which is especially suited for snow observations and provides reliable values of effective reflectivity, Doppler velocity and spectral width. The proposed method is freely available on the web and features a noise removal based on recognition of the most significant peak. A dynamic dealiasing routine allows observations even if the Nyquist velocity range is exceeded. Collocated observations over 115 days of a MRR and a pulsed 35.2 GHz MIRA35 cloud radar show a very high agreement for the proposed method for snow, if reflectivities are larger than -5 dBz. The overall sensitivity is increased to -14 and -8 dBz, depending on range. The proposed method exploits the full potential of MRR's hardware and substantially enhances the use of Micro Rain Radar for studies of solid precipitation.