Preliminary analysis to design a 77 GHz weather radar

S. Bertoldo, C. Lucianaz, M. Allegretti, G. Perona
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引用次数: 1

Abstract

The European Telecommunications Standards Institute (ETSI) defines the frequency band around 77 GHz as the one dedicated to automatic cruise control long-range radars. This work presents the preliminary analysis for the design of a mini weather radar and/or a microwave rain gauge operating at such a frequency. Firstly, the Mie scattering formulation applied to a weather radar working in the W-band is briefly introduced, then the operative conditions are described in order to define the system functional requirements. Atmospheric attenuation, including the contribution due to water vapor, is estimated taking into account the ITU-T recommendations. The technical specifications are evaluated in order to meet the functional requirements, paying particular attention to the use of already developed components for radars installed on cars. A sensitivity analysis of the system is also given considering the proper relationship between the radar reflectivity factor Z and the rain rate R determined for a 77 GHz radar. Results provide the basis for the design and realization of a 77 GHz weather radar.
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初步分析了77 GHz气象雷达的设计
欧洲电信标准协会(ETSI)将77 GHz左右的频段定义为专用于自动巡航控制远程雷达的频段。这项工作提出了在这种频率下工作的小型气象雷达和/或微波雨量计的初步设计分析。首先简要介绍了w波段气象雷达的米氏散射公式,然后对其工作条件进行了描述,明确了系统的功能要求。大气衰减,包括水蒸气的贡献,是在考虑ITU-T建议的情况下进行估计的。对技术规格进行评估,以满足功能要求,特别注意使用已经开发的安装在汽车上的雷达组件。考虑到77 GHz雷达的雷达反射率因子Z与雨率R之间的适当关系,对系统进行了灵敏度分析。研究结果为77 GHz气象雷达的设计与实现提供了依据。
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