Research On Personnel Location System Of Power Plant Based On Ultra Wide Band Technology

With the development of Internet of Things technology,the intelligence of the power plant has gradually become the focus of construction.Due to the complex buildings in power plants and the large number of personnel and equipment,the safety of power plant personnel has become a key issue that cannot be ignored.Among many indoor positioning technologies,Ultra Wide Band(UWB)technology is the most stable and cutting-edge indoor positioning technology,which has the characteristics of efficient transmission rate,low transmit power,strong resistance to multipath,low radiation,etc.It is widely used in smart factories,smart logistics and other fields to provide accurate positioning solutions for plants.In this thesis,we designed an ultra-wideband technology-based positioning system for indoor personnel in a power plant in the context of a power plant personnel positioning system project in an internship unit.The main research work of the paper is as follows:(1)An improved Chan-Taylor hybrid weighting algorithm is proposed.By comparing the advantages and disadvantages of four different localization methods in ultra-wideband localization technology,the TDOA estimation method based on signal arrival time difference is selected as the localization method.Focusing on the most commonly used localization algorithms Fang,Chan and Taylor series expansion method,the improved Chan-Taylor hybrid weighting algorithm is given by combining Chan algorithm,which has relatively small time complexity,and Taylor algorithm,which has suppression effect on non-visual distance and multipath.Then MATLAB is used for simulation modeling.It indicates that the improved Chan-Taylor hybrid weighting algorithm has higher positioning accuracy comparing with the traditional Chan and Taylor algorithms.(2)Based on the theoretical analysis,an indoor positioning system for power plant staff depending on ultra-wideband technology is designed and implemented.The indoor positioning system for power plant staff includes two major parts: hardware and software.The hardware part includes the main control module,UWB positioning module,power supply module,communication module and motion sensor module.The powerful STM32F407VGT6 chip is selected as the main control chip.The DW1000 is selected as the positioning chip to send and receive UWB signals.The power supply module supplies power to other modules.The communication module transmits positioning data through Ethernet.In order to control the working mode of the UWB positioning module to reduce the power consumption of the tag,the LIS2DH12 chip is applied in the motion sensor to determine if the tag is moving by detecting the acceleration of three axes.The software part includes positioning engine,positioning base station and positioning tag.The positioning engine calculates the position through Impulse Radio Ultra Wide(IR-UWB)technology,receives the signals transmitted by the positioning base station and the positioning tag,parses the received signals and calculates the position of the positioning tag through the relevant positioning algorithm.(3)The system test platform is built to verify the basic functions and performance of the system hardware when the hardware and software are finished.The functions of map management,personnel management,trajectory analysis,electronic fence division,intelligent inspection and real-time location display are successfully realized.The results show that the power plant positioning system has good ranging effect and the positioning error is within 30 cm,which meets the positioning requirements of indoor personnel in power plants and can be widely used in the actual power plant environment..The innovation of this paper is to propose an improved Chan-Taylor hybrid weighting algorithm for locating personnel in power plants,which improves the positioning accuracy.In the hardware design part,a motion sensor module is added to the positioning tag to reduce the power consumption of the tag and extend the standby time of the tag.The software architecture is designed with a powerful location positioning engine,which can be calculated to derive accurate location information.Finally,the practicality of the power plant personnel positioning system is verified at different levels through the basic function test,service function test and on-site positioning system test.