双prf扫描模式和自适应多普勒速度处理提高雷达晴空速度数据覆盖率和可用性

Q4 Energy
Qin Xu, Valery melnikov@noaa.gov, K. Nai
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引用次数: 0

摘要

利用延长停留时间、降低脉冲重复频率(PRF)和降低奈奎斯特速度的长脉冲,可以增强雷达测量能力,增加晴空多普勒速度数据的覆盖范围(这有利于雷达风分析和数据同化,也是我们之前研究的动机)。除了我们之前的研究之外,我们还进一步探索了这种潜在的能力,不仅修改了现有的操作晴空扫描模式,降低了PRF,降低了奈奎斯特速度(接近12米/秒),而且还将这种低PRF扫描与高PRF扫描耦合成一种新的双PRF扫描模式。使用这种双prf扫描模式,高prf扫描的速度可以用来去除低prf扫描的原始速度。在这种双prf扫描模式下,使用低prf扫描收集的多普勒速度显示出增强的晴空数据覆盖范围,但在高prf扫描覆盖的径向范围之外,在去噪方面遇到了更大的困难。为了克服遇到的困难,进一步自适应改进了先前开发的用于分析具有小奈奎斯特速度的严重混叠雷达速度观测的混叠鲁棒变分方法,从而可以获得可靠的参考径向速度,并用于在高prf扫描覆盖范围之外的距离圆上去除低prf扫描原始速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Dual-PRF Scan Mode and Adaptive Doppler-Velocity Dealiasing to Increase Radar Clear-Air Velocity Data Coverage and Usability
By using long pulses with extended dwelling time, lowered pulse repetition frequency (PRF) and reduced Nyquist velocity, the radar measurement capability can be enhanced to increase clear-air Doppler velocity data coverage (which is beneficial for radar wind analysis and data assimilation and motivated our previous study). This potential capability is further explored (beyond our previous study) by not only modifying the existing operational clear-air scan mode with a lowered PRF and reduced the Nyquist velocity (to nearly 12 m/s) but also coupling this low-PRF scan with a high-PRF scan into a new dual-PRF scan mode. With this dual-PRF scan mode, the velocities from the high-PRF scan can be used to dealias the raw velocities from the low-PRF scan. Doppler velocities collected by using the low-PRF scan in this dual-PRF scan mode exhibit enhanced clear-air data coverage but encounter increased difficulties in dealiasing beyond the radial range covered by the high-PRF scan. To overcome the encountered difficulties, the previously developed alias-robust variational method for analyzing severely aliased radar velocity observations with small Nyquist velocities is further improved adaptively, so reliable reference radial velocities can be obtained and used to dealias the low-PRF scanned raw velocities on range circles beyond those covered by the high-PRF scan.
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来源期刊
Journal of Nuclear Energy Science and Power Generation Technology
Journal of Nuclear Energy Science and Power Generation Technology Energy-Energy Engineering and Power Technology
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