The Design And Implementation Of The NTP Network Timing System

The rapid development of information science and in all areas of society increasingly wide range of applications, the development of modern society has played a great role in promoting, and the military also have a far-reaching impact on all branches of the armed forces, professional branch of the military, professional troops joint operations and the diffent nation's army forces in joint operations has become a major operation. Used to ensure the integration of operations of joint operations command platforms in the various military command systems, distributed information systems and the major application areas, need to rely on computer reliability and efficiency critical to accurately control the work of task, and it on the platform for a variety of applications within the system, weapons and equipment and user terminals clock a higher consistency and accuracy requirements. Existing command information systems, the general structure of its network backbone network using multiple redundant multi-channel backup Ethernet WAN interconnection structure. The time synchronization system, often through a wide area network based on the unification of the EC, equipment, use NTP (Network Time Protocol) to the various types of system clock sync. In peacetime, network connectivity assured, command a relatively constant level of circumstances, can effectively meet the requirements of time synchronization system, but in all kinds of operational tasks and carry out military operations, can not guarantee full-time all-domain network connections, such models can not fully meet the application requirements.In this paper, the military action in the instability characteristics of the network and the existing clock synchronization mechanism on the basis of, for its characteristics, a delegate at the NTP network system design.Firstly, the paper simply introduces all of the current military command information system used by the Commission when the systems of various types of military operations and combat missions network system characteristics, as well as existing EC system, the protection of military operations and combat missions in the , on the battlefield through the analysis of characteristics of the network environment, and computer system clock synchronization requirements, clear objectives of the system, have been the design of the system hardware and software requirements.Secondly, the demand on the basis of the analysis, the overall design of the system. Hardware design, given NTP server hardware block diagram of the hardware structure. Software design, focusing on the network design award at the function of the system architecture and network architecture.Again, according to the system's design, the detailed design of the system and implementation, mainly in three aspects: 1st, the NTP, awarding the network server system hardware circuit design, embedded on the server hardware selection, system architecture, and expounding on the system all the major modules of the circuit design methodology; 2nd, of the system awarding NTP network server-side software services NTP, awarding a detailed design, its features were described and presented the realization of the key used by the technology; 3rd, of the NTP network client delegated the system clock synchronization software for the detailed design of its various modules were discussed on its methods and technical issues involved.In this paper, combining different parts of the system design and implementation, respectively, of the concept of embedded systems, ARM microprocessor, GPS Timing principle, NTP,μCLinux embedded operating system migration and the establishment of cross-compiler environment, and other related technologies are concise presentation.The design of the system awarding NTP network, able to adapt to the military action in time for the needs of the services can be delegated, as a backup for the existing systems.