To estimate the time comparison error due to instrumentation ship motion during two-way satellite transfer between an instrumentation ship and a land-based station, 6-DOF (Degree of Freedom) motion of the instrumentation ship is analyzed, the reference point is chosen and a coordination system is established. A model for estimation of the aggregate movement quantity of the reference point of the instrumentation ship in a transfer period is proposed and a method for time comparison accuracy estimation is given. The impact of each dimension of instrumentation motion on time comparison accuracy is also analyzed and correction formulas are presented. Calculation result shows that, under normal conditions, the time comparison accuracy of ship-land two-way satellite transfer is less than 9ns, and based on the current available technology, the accuracy is less than 3. 41ns (3a) after correction (assuming that the time comparison accuracy of land-land two-way satellite transfer is less than 1 ns).%针对岸船卫星双向时间比对中船载时统站空间运动引起的对时误差估算问题,通过分析测量船六自由度运动规律,从而选定考察点,建立测量船质心坐标系；提出在一个对时周期内(约0.27 s)船载站考察点空间运动总量估算模型,并给出岸船卫星双向时间比对精度估算方法.在分析测量船各维度运动量对岸船对时精度影响的基础上,得出了校正公式.计算结果表明:正常测量工况下,岸船卫星双向时间比对精度优于9 ns；基于现有测量手段,校正后岸船卫星双向时间比对精度可达3.41 ns(3σ,取陆基站间对时精度为1 ns).
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