这些位置报告是基于精确导航系统譬如gps。

These position reports are based on accurate navigation systems, such as GPS.

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它们使用组合惯性，卫星和星形用于精确导航和定位。

They use a combination of inertial, satellite, and stellar for accurate navigation and positioning.

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针对单一捷联式惯性导航系统无法进行长时间精确导航的难题，讨论了组合导航系统的实现方法。

SINS can hardly meet the requirements of longtime. To solve the problem of SINS, the integrated navigation system design method is studied in this paper.

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