Clock Wireless Synchronization System Based On GPS Technology And Wireless Sensor Networks

Issue of multi-location or room of clock synchronization in the civil situation was proposed in the project. A set of clock wireless Synchronization System was designed based on GPS technology and Wireless Sensor Networks. The system is a wireless network made up of a time service device and several electronic clocks.Structure of the time service system based on Wireless Sensor Networks was designed, and format of communication data frame was defined.Hardware block diagram of the time service device and the electronic clocks was provided in the paper. In order for hardware implementation, Atmel89S52 was used as microprocessor, SiRF Star III GPS receiver module was used to receive signal from the satellites, nRF905 of Nordic Co was used to send and receive data, DS1302 was used as local time of the system, 74LS373 and ULN2003 was used to latch and drive the big LED nixie tube for displaying time.C51 was used as programming language of the software. The flow chart of main program and interrupt subprogram of the time service device and the electronic clocks were presented in the system. GPS signal receiving program, receiving and sending program of nRF905, reading and writing program of DS1302 and display program of LED were presented as modules.Experiment boards were developed in the project and debugged on spot.