Research on multihop network time synchronization algorithm based on 5G co-band signals

5G Co-band signals have been widely used in wireless communication navigation. With the continuous development of 5G, people's requirements for positioning accuracy are constantly increasing. TOA and TDOA are commonly used measurement and positioning methods. TOA and TDOA positioning methods need to determine the arrival and reception time of signals, which puts higher requirements on the time synchronization accuracy in wireless networks. This paper studies the time synchronization of 5G Co-band signals in multi-hop networks. In view of the problem of reduced synchronization accuracy caused by the cumulative error of measurement noise in multi-hop grids, the child node uses logical clock drift and logical clock offset as the observation vector of Kalman filter to predict and correct the time phase estimation and frequency estimation of the parent node. The experiment shows that, the time synchronization accuracy of 5G Co-band signals in multi-hop network nodes has been dramatically improved.