Design Of High Precision Wireless Clock Synchronization System Based On DSP

Clock synchronization in the power system of the fault point of repair,the communication system based on time billing,high real-time industrial control sys tem plays a vital role.Many methods of clock synchronization,the most widely used is the International Institute of electrical and Electronic Engineers(IEEE)sy nchronous clock IEEE 1588(also called precision time protocol(Precision Time P rotocol))for the proposed special protocol.It is a protocol which can realize th e high precision clock synchronization in the control system,and integrates a nu mber of technologies.The application of the protocol is based on the network,which can achieve the sub microsecond synchronization accuracy in the case of t he least network and local computing resources.In this paper,the design and implementation of a clock synchronization met hod based on DSP is not limited by the network,the synchronization algorithm directed at the heart of the crystal oscillator clock module.Due to the factors th at affected the temperature,humidity,electromagnetic interference,mechanical vib ration and shock,the power fluctuation of the crystal are nominal value does not match the phenomenon with the actual value,which leads to the deviation of tr avel time.In this paper,the design of the clock synchronization system is effecti ve to correct the travel time deviation,and to achieve the clock synchronization accuracy at ±4?s level.The main control chip of the system clock module is DSP microprocessor C2000 series TMS320F28335 double precision floating point chip.F28335 is a hig h performance chip,with strong control and signal processing capabilities,to ach ieve complex control algorithms,so the design is very suitable for.The system u ses a clock source module and a plurality of clock modules.The clock source module using 20 MHz OCXO,in order to facilitate comparison,three calibrated c lock module using 10 MHz,20MHz,26 MHz of OCXO.The clock source module through the wireless communication module to send periodic timing signal,calib rated clock module according to the received timing signal,calculating the runni ng error and the adaptive control algorithm to achieve time constant timer correc tion,so as to achieve clock synchronization.