DOMUS: DOppler MUltiple-Scattering Simulator
DOMUS: DOppler MUltiple-Scattering Simulator
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DOMUS：多普勒多重散射模拟器
DOI：
10.1109/tgrs.2010.2052818
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发表时间：
2011
影响因子：
8.2
通讯作者：
S. Tanelli
中科院分区：
文献类型：
--
作者：
A. Battaglia;S. Tanelli
多重散射（MS）强烈影响CloudSat的W波段云廓线雷达（CPR）的反射率时，卫星是越过中等和强降水系统。随着即将部署的W波段多普勒雷达在空间地球云，气溶胶和辐射探测器的CPR在primis-and检索对流系统内的垂直运动的目标，有一个迫切需要评估的影响MS上的多普勒签名。蒙特卡罗程序能够模拟由于高阶散射的反射率增强已被扩展到包括多普勒效应。本文介绍了在蒙特卡罗方法中加入多普勒分析的主要准则。据我们所知，这个模拟器是第一个能够模拟现实的多普勒信号在MS的存在。案例研究首先提出了在均匀的波束填充条件下，从云解析模型模拟深对流（即，一维剖面用于描述分层大气的特征）。仿真结果表明，在MS对雷达信号影响较大的距离上，雷达信号表现出以下两个主要特征：1）多普勒频谱随MS增强而展宽，叠加了卫星运动引起的单次散射多普勒衰落; 2）后向散射信号的平均多普勒偏离由垂直风和水凝物的联合作用确定的平均多普勒。在MS贡献显著超过SS的高度以下的所有距离单元处的终端速度。模拟器也可以在非均匀束填充条件下运行（即，3-D场用于在小于雷达分辨率的尺度上表征大气）。凭借其先进的能力，它为评估即将到来的高频星载多普勒雷达的性能提供了一个独特的工具。
Multiple scattering (MS) strongly affects CloudSat's W-band cloud-profiling radar (CPR) reflectivity when the satellite is overpassing moderate and heavy precipitation systems. With the upcoming deployment of W-band Doppler radars in space-Earth Clouds, Aerosols, and Radiation Explorer's CPR in primis-and the goal of retrieving vertical motions within convective systems, there is an urgent need to assess the impact of MS onto the Doppler signatures. A Monte Carlo code capable of simulating the reflectivity enhancement due to higher orders of scattering has been extended to include the Doppler effects. This paper presents the main guidelines for the inclusion of the Doppler analysis into the Monte Carlo scheme. To our knowledge, this simulator is the first one capable of simulating realistic Doppler signals in the presence of MS. The case studies are first presented in uniform beam-filling conditions for the profiles extracted from a cloud-resolving model simulation of deep convection (i.e., 1-D profiles are used to characterize a stratified atmosphere). The simulations demonstrate that, at ranges where MS contributions affect the overall radar signal, two main features appear as the following: 1) The Doppler spectrum tends to broaden with increasing MS enhancement, adding up to the single-scattering (SS) Doppler fading due to the satellite motion; and 2) the mean Doppler of the backscattered signal departs from the mean Doppler determined by the combined effect of the vertical-wind and hydrometeor-terminal velocities at all range bins below the altitude where the MS contribution significantly overcomes the SS. The simulator can be run in nonuniform-beam-filling conditions as well (i.e., a 3-D field is used to characterize the atmosphere at scales smaller than the radar resolution). With its cutting-edge capabilities, it provides a unique tool for the evaluation of the performances of the upcoming high-frequency spaceborne Doppler radars.
影响因子：
3.1
作者：
R. Hogan;A. Battaglia
通讯作者：
R. Hogan;A. Battaglia