The research of time synchronization in distributed virtual geographic environment

The time synchronization in distributed virtual geographic environment is the premise to time-space consistency of the system and to make sure it can simulate correctly,in which way the user can cognize the virtual geographic environment accurately.In this paper,among the three time conceptions in distributed virtual geographic environment,the research of machine time synchronization and simulation time synchronization have been emphasized.A self-adaptive time synchronization model and algorithm have been put forward which based on network time-lapse,time deviation of system nodes and low-time-dip of operating system and computer itself.