According to the museum, this X-45 carried out 40 sorties, and became the first autonomous flight of a high-performance, combat UAV. The program lasted until 2005.

据博物馆，这种X - 45进行了40架次，成为第一个高性能的自主飞行，作战无人机。该计划持续到2005年。

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Therefore, it becomes an urgent need to look for a kind of registration algorithm which is adaptable, highly precise, fast to UAV in a complex battlefield environment for autonomous navigation.

因此，寻找一种具有适应性强、精度高、配准速度快的算法成为无人机在复杂战场环境下自主导航的迫切需要。

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The UAV is completely autonomous, relying on sensors and computers to navigate from take off to landing.

这架无人机完全自主航行，从起飞到着陆只需凭借传感器和电脑即可完成。

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