Simulated Doppler radar observations of inhomogeneous clouds: Application to the EarthCARE space mission
Simulated Doppler radar observations of inhomogeneous clouds: Application to the EarthCARE space mission
复制标题
非均匀云的模拟多普勒雷达观测：在 EarthCARE 太空任务中的应用
DOI：
10.1175/2007jtecha956.1
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发表时间：
2008
影响因子：
2.2
通讯作者：
N. Schutgens
中科院分区：
文献类型：
--
作者：
N. Schutgens
摘要提出了一种针对非均匀目标的星载多普勒雷达观测模拟技术。云的不均匀性以两种方式影响多普勒观测。首先，在瞬时视场内的视线速度是不相等加权的。由于星载雷达的大向前运动有助于这些视线速度，这导致观测到的多普勒速度的偏差。其次，接收器电压现在具有时变随机特性，增加了多普勒观测的不准确性。与传统的基于傅立叶逆变换的随机信号模拟相比，新技术预测了更大的观测多普勒速度的不准确性。多普勒速度观测的准确性由星载95 GHz雷达[作为拟议的欧洲航天局（欧空局）/日本宇宙航空研究开发机构（JAXA）/国家信息和通信技术研究所（NICT）EarthCARE使命的一部分]通过模拟评估...
Abstract A new simulation technique for spaceborne Doppler radar observations that was developed specifically for inhomogeneous targets is presented. Cloud inhomogeneity affects Doppler observations in two ways. First, line-of-sight velocities within the instantaneous field of view are unequally weighted. As the large forward motion of a spaceborne radar contributes to these line-of-sight velocities this causes biases in observed Doppler speeds. Second, receiver voltages now have time-varying stochastical properties, increasing the inaccuracy of Doppler observations. The new technique predicts larger inaccuracies of observed Doppler speeds than the traditional random signal simulations based on the inverse Fourier transform. The accuracy of Doppler speed observations by a spaceborne 95-GHz radar [as part of the proposed European Space Agency (ESA)/Japan Aerospace Exploration Agency (JAXA)/National Institute for Information and Communications Technology (NICT) EarthCARE mission] is assessed through simulat...