Research On Wireless Channel Measurement And Measured Data Fitting Based On Smart Meter

With the advancement of science and technology and the development of the Internet of Things,the meter reading mode of the power system has also undergone significant changes.Manual meter reading is time-consuming and labor-intensive.The smart meter networking technology can realize the functions of wireless meter reading,centralized control and automatic billing,which prompts the power supply enterprise to transform from manual meter reading business to automatic meter reading business.Wireless channel is the transmission medium of wireless communication system.The research on wireless channel is the key to ensure the reliable transmission of smart meter networking data.In this thesis,the transmission characteristics of wireless signal is taken as the theoretical background,and the theoretical research and engineering practice are combined to realize the purpose of channel measurement and modeling.Firstly,the largescale fading characteristics and small-scale fading characteristics of wireless channels are introduced.The measurement principle and modeling principle of large-scale fading and small-scale fading are discussed.The measurement methods and modeling methods in practical engineering are determined.The construction and processing of measurement data provides theoretical guidance.Based on the characteristics of the wireless channel in the 470MHz-510 MHz frequency band,the hardware platform and software platform for wireless channel measurement are built independently.The system hardware platform includes NI USRP RF module,GPS positioning device,PC control machine and other equipment;when designing the software platform,in order to facilitate measurement and operation,the platform is divided into large-scale measurement platform and small-scale measurement platform.It also measures and obtains a large amount of measurement data for indoor office building scenes,classroom building scenes,dormitory building scenes and underground garage scenes,as well as outdoor suburban residential area scenes,bustling market scenes,urban park scenes and suburban park scenes.Finally,the measurement data is processed,and large-scale characteristic parameters and small-scale characteristic parameters are extracted to establish corresponding indoor and outdoor channel transmission models.The measurement results show that the software and hardware platform designed in this paper can adapt well to a variety of external field environment measurements,and the established indoor and outdoor channel models also lay the foundation for the development of next-generation broadband micropower technology.