| China is located between the Pacific Rim Seismic Zone and the Eurasian Seismic Zone and squeezed by the Pacific plate,the Indian plate and the Philippine plate.Because of the special geographical location,earthquake disasters occurred frequently,causing huge financial losses and casualties in China.After the disaster,it is the first task of rescue to locate the people trapped in the earthquake ruins quickly and accurately.Distributed life detection radar cooperative detection technology is one of the important means to solve the problem of rapid detection and location of people that trapped in large areas of ruins after disasters.it can cover a large area of debris with a single detection and quickly detect whether there are trapped people under the earthquake ruins.In the process of detection,it is one of the technical difficulties for distributed life detection radar to collect and transmit data efficiently and reliably.In order to solve the technical difficulties,a distributed wireless data transmission system combined with life detection radar was designed based on low power RF chip(NRF24L01P).The system successfully transmitted the data which collected by multiple life detection radars to the upper computer through wireless links.At the same time,the upper computer could also control the working status of each life detection radar through wireless links.The main research work of this thesis were as follows:1.Comparing and analyzing different life detection radar technologies,using ultra wide band(UWB)stepped-frequency radar to build distributed life detection system,and put forward the overall design scheme of distributed wireless transmission system.2.According to the overall design scheme of the system,the hardware circuit design of the transmitter terminal adapter board,wireless module and receiver terminal adapter board was completed.The hardware selection and design ideas of each part were elaborated in detail by modules,and the hardware circuit design schematic diagram of each circuit board was given.Then the communication distance of the designed wireless module was theoretically verified.3.Based on the hardware circuit of the system,the software of the system was designed in modules.The design of data acquisition program and transmitter program of life detection radar were completed on the FPGA,and the designed program was simulated and validated.The design of one-to-many wireless communication program and W5500 network port driver were completed on STC single chip computer,and the wireless communication protocol of TDMA mode was designed to solve the data transmission interference problem of multiple radar nodes.4.The program was downloaded to the corresponding circuit board for single board debugging,and the communication performance of the wireless module was tested separately.Then a wireless data transmission system was built for system debugging,and the data of multiple radar nodes are successfully collected.Finally,the existing problems of the system were analyzed and summarized,and the improvement ideas were put forward.In this thesis,a wireless data transmission system was designed for distributed life detection radar system,which have settled the problem of multi-point data transmission of distributed life detection radar cooperative detection technology.To a certain extent,the research of distributed life detection radar cooperative detection technology was promoted,and had reference value for the hardware design of distributed life detection radar. |
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