Ka频段雨衰测量系统与其衰减计算仿真软件设计和实现

【Abstract】wWw.shuoshilunwen.com In view of the Ka-band with the characteristics of ailable bandwidth, less interference, and all devices, Ka-band satellite communications become the research focus both at home and abroad. Meanwhile the high frequency of the Ka-band also brings the following disadvantage: big rainfall attenuation. Therefore, the key research at present is to study the physical characteristics of rainfall, analyze the mechani of how rainfall affects radio propagation, obtain rainfall attenuation statistics, apply and modify mature technology of resistance to rain attenuation with mathematical models.Based on the above, this paper will design and implement a system for the measurement and analysis of the Ka-band rain attenuation, which is a set of system containing the rainfall data collection, the observation and record of Ka-band communication attenuation data, the processing and analysis of the measuring data, and the software of attenuation calculation analysis. In the process of implementation of this system, it mainly includes the followings:1. It analyzes by demand the Ka-band rain attenuation measurement and the function of the analysis system, definitely sets the main functions of the system need to be done, divides the system by functions, and gives out the overall design scheme.2. It gives the measurement system and details the design and implementation of subsystems of measurement of rainfall characteristics and Ka-band attenuation; Besides, it also details various subsystems of the experimental parameters, experimental data, testing, record and initial treatment.3. It studies the theory of the mechani of how rainfall affects radio propagation, Raindrops spectrum, features attenuation, attenuation prediction models, and especially focuses on the ITU-R rainfall forecasting model. And then the theoretical basis of the amendment of model parameters is summarized. Based on these theories, the followings are given out, the processing method and analysis result of attenuation measurement data, and the basis of algorithms.4. Combined with the basic theory Matlab algorithm, it designs and develops a Ka-band attenuation analysis software, gives out the overall architecture of software design and implementation functions; and sets a software for a complete functional test.After the hardware and software testing it shows that the designed Ka-band rain attenuation measurement and functional modules and interface of analysis system work properly and stably