The Designment And Implementation Of Protocols In Micro Spectrum Sensor Heterogeneous Networks

With the wide application of radio technology,the contradiction between supply and demand of electromagnetic spectrum resources has become increasingly prominent.It is necessary to monitor and manage such limited and non-renewable resources in order to realize the scientific utilization of resources and the sustainable development of social economy.By fusing wireless sensor network technology and establishing wireless distributed spectrum monitoring system to realize electromagnetic spectrum monitoring,wireless spectrum sensing network monitoring technology has become an important means to implement electromagnetic spectrum monitoring.However,the existing technology of electromagnetic spectrum monitoring based on wireless sensor networks still has many drawbacks in many aspects.Due to the fact that the demand for spectrum monitoring in the harsh environment such as ocean,island,coastal defense and field battlefield where people are unable to reach is increasingly urgent,but the existing electromagnetic spectrum monitoring equipment in China has some shortcomings,such as large volume,inconvenience for flexible deployment,low data transmission rate of wireless network,and single networking mode,which can not guarantee reliable data transmission,and can not meet the needs of remote areas.In order to meet the needs of spectrum monitoring,it is a problem worth studying to improve the existing technology,build a micro spectrum sensor heterogeneous network with miniaturized electromagnetic spectrum monitoring equipment,expand the scope of spectrum monitoring,and still monitor and manage the electromagnetic spectrum environment in real time and effectively in the environment that human can not reach.The research results of this thesis are applied to the national defense "13th Five-Year Plan" pre-research project "XXX spectrum sensing technology" to effectively promote the spectrum situation and control.Its main research contents are as follows:1)Transplanting Linux operation system based on Zynq-7000 platform and establish control center.Specifically,under the Ubuntu system,cross-compiled files such as U-boot and Linux-4.6 kernel,which are suitable for the realization of miniaturized sensor node functions in the network,and started the kernel in three ways: JTAG,QSPI and SD card.2)Building a channel for data transmission in micro spectrum sensor heterogeneous network.Firstly,realize the networking of the 4G module ME3760 based on Zynq-7000 platform,modify and cross-compile the Linux-4.6 kernel and driver according to the driver installation and loading mode with NDIS port,realize the automatic identification of the 4G module and dial-up networking after power-on.Secondly,the internal character driver of Linux kernel is used to open the memory mapping to realize the data interaction between the data acquisition unit FPGA and the control center(ARM)in the network node.3)The protocol adapted to the requirement of spectrum monitoring is designed and implemented to protect the data transmission between network nodes.Firstly,the data interaction protocol between ARM and FPGA is designed to realize the real-time acquisition of specified spectrum data through the control of FPGA by ARM in sensor nodes.Secondly,the application layer protocol to ensure the communication of network nodes is designed to realize the reliable transmission of instructions and return data between network nodes,and to ensure the realization of single-frequency scanning,digital scanning and frequency hopping signal analysis functions of network nodes.