一种双基地雷达时间同步的新方法

摘要

提出了一种基于对流层散射双向时间比对的双基地雷达时间同步的新方法（TWT3S），利用对流层散射通信设备进行雷达站间双向时间比对以求取雷达站间精确的时间差。详细推导了TWT3 S的计算模型，对时间间隔测量误差、发射与接收设备时延误差、对流层时延误差、几何距离时延误差进行了讨论，并给出了TWT3 S的理论精度。计算结果表明，对流层时延误差是最主要的误差来源，占所有误差的90％以上。 TWT3 S模型的理论精度为15～21 ns，比采用微波或光纤直接同步法精度高，为双基地雷达时间同步提供了新的思路。%A novel method for time synchronization of bistatic radar system is put forward based on two -way time transfer via troposphere scattering ( TWT3 S ) .In order to get accurate time difference of the radar stations,the troposphere scattering communication equipments are employed to contrast bilateral time signals.Firstly,the calculation model of TWT3S is deduced in detail.Then the time interval measurement error,the launching and receiving device delay error,the tropospheric delay error and the geometrical distance error are studied .Finally,theoretical precision of TWT 3 S is presented .The computational results demonstrate that tropospheric delay error is the main error,which accounts for more than 90%of all errors. Further more,theoretical precision of TWT 3 S system is 15~21 ns,and obviously it has a better performance compared with the direct synchronization method via microwave or optical fiber channel .The work provides a new way for time synchronization of bistatic radar system .