The Design And Development Of Time Service In Air Defence System Based On GPS

Along with social progress and rapid development of science and technology, civil air defense construction to cater to today’s world "confrontation and dialogue, cooperation and competition, peace and development, opportunities and challenges," co-existence of characteristics, in order to meet the requirements of today’s high-tech local wars, also gradually automated, programmable, multi tool, multi-network support of the development. Air defense air defense system as timing the process of building an important part of it for the time synchronization accuracy requirements are also increasing. Global Positioning System (GPS) and its maturing rapidly developing situation, the air defense system timing synchronization timing technology to a new level. Since GPS-based air defense system timing can be a good time to ensure the accuracy and consistency of the system, making the various components within the system or between systems and systems to maintain accurate time synchronization, so this air defense system timing In many countries continue to be among the civil air defense research and development, and has been widely used.This article first air defense hardware timing system overall design, use of STC12C5A60S2 as the core control unit receives GPS satellite data by the standard time for school, then brought some of the main devices of different output interface, the output of different formats timing signal, the use of high-precision clock chip DS12C887 system on time. Through RS232, RS485 or nRF905 wirelessly sent to the current precise time point of each school to improve the system’s versatility. At the same time the system is embedded in the PM66 voice chip, the whole point timekeeping function. The system can be controlled by remote host computer associated set to meet the requirements of the remote control. Paper introduces the hardware and software design of the system, given the hardware circuit diagram and software flow chart, but also with field application needs, the electromagnetic compatibility of the system designed in detail. Through the commissioning, the system has high precision timing, stability, and good signal to meet the design requirements.