The error derived from the observer and his instruments in surveying astronomical longitude is called the person and instrumental equation, which must be corrected in the first and second degrees.

摘要： 在天文经度测量中，由观测员及其所用仪器引起的误差称为人仪差，在一、二等天文测量中必须加入此项改正。

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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。

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