2. In this paper, the simulation results show that the level damp of DINS can reduce the influence of the external velocity error, decrease damping time, and restrain the error of longitude effectively. 通过仿真分析,比较2套阻尼系统的误差结果,可以看出双惯导外水平阻尼能够显著降低外速度误差的影响,减少阻尼时间,抑制经度误差。