高动态多平台高精度时频同步方法研究OA

For the problems of Doppler frequency shift,dynamic propagation delay and clock drift in time synchronization of multi-platform with high dynamic motion,a frequency synchronization scheme introducing a standard source based on a phase-locked loop is proposed.Under the condition of frequency synchronization,a time synchronization scheme is designed based on the carrier phase difference of co-viewed navigation satellites received by the two platforms.Firstly,each platform uses a local high-precision atomic clock to generate a stable frequency source signal,and the local atomic clocks of different platforms are synchronized with the atomic clocks of navigation satellites to solve the frequency synchronization problem.The frequency synchronization loop is split into a GPS clock taming synchronization loop and a high-precision Ku-band generation loop based on a reconstructed 10 MHz clock source for separate simulation,which solves the problem of excessively long frequency synchronization simulation time.The two platforms co-view at least five navigation satellites,and the phase integer ambiguity resolution is realized by using the received navigation signal phase and the single difference and double difference of pseudorange.Then,the nanosecond-level accurate calculation of the local clock error of each platform is achieved by using the single difference,realizing high-precision time synchronization.Simulation results show that the Ku-band synchronization accuracy is better than 15 Hz,the linear synchronization accuracy is better than 10 Hz/s,the fixed time accuracy between platforms during uniform motion is better than 10 ns,the linear time synchronization accuracy is better than 2 ns/s,the fixed time synchronization accuracy between platforms during co-directional motion with different accelerations is better than 40 ns,and the linear time synchronization accuracy is better than 3.994 4 ns/s.