v波段O2差分吸收雷达大气测量的海面反射模拟

B. Lin, Matthew Walker Mclinden, G. Heymsfield, Yongxiang Hu, N. Privé, Lihua Li, S. Harrah, K. Horgan, Xia Cai, J. Carswell
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引用次数: 0

摘要

本研究利用差分吸收雷达模拟v波段海面反射率和归一化雷达截面(NRCS)的海面气压测量,该雷达工作在三个频谱均匀间隔的近波段(65.5、67.75和70.0 GHz),交叉航迹扫描角为±15°。两个相邻频率对的反射率比和两比或三通道方法的比值是本研究的重点。分析了海温、风、盐度、白浪和入射角等主要海面地球物理变量对这些反射特性的影响。反射模拟本质上是基于粗糙海面的几何光学。模拟结果表明,在扫描角度内,NRCS值足够强,海面盐度只会对表面反射产生很小的变化。当使用频率配对雷达信号的比率时,海面反射随海面温度、风和白浪的变化对海面气压测量的影响减弱。此外,三通道方法的比率非常接近于一致,因此在海平面压力反演中可能不需要对反射率比率进行校准或补偿。这些结果提高了我们对海面反射变化的理解,有助于系统的设计和开发。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Simulations of sea surface reflection for V-band O2 differential absorption radar barometry
This study simulates V-band sea surface reflectance and normalized radar cross-section (NRCS) for sea surface air pressure barometry using a differential absorption radar operating at three spectrally even spaced close frequency bands (65.5, 67.75 and 70.0 GHz) with ± 15° cross-track scanning angle. The reflectance ratios of two neighboring frequency pairs and the ratio of the two ratios or three-channel approach are the focus of this study. Impacts of major sea surface geophysical variables such as sea surface temperature, wind, salinity, whitecap, and incidence angle on these reflection properties are analyzed. The reflection simulation is essentially based on geometric optics of rough sea surface. Simulation shows that NRCS values are sufficiently strong within the scanning angle and sea surface salinity would only introduce minimal variations in the surface reflection. The impact of sea surface reflection variations with sea surface temperature, wind, and whitecaps on sea surface barometry are mitigated when the ratios of frequency-paired radar signals are used. Furthermore, the ratios of a three-channel approach are very close to unity and calibration or compensation for the reflectance ratios may not be needed for sea level pressure retrievals. These results improve our understanding of sea surface reflection variations and would help the system design and development.
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