中文摘要：

伴随无线传感器的发展，其在军事、环境监测、卫生医疗、智能家电等方面的应用已经被提出，其在海事搜救过程中的应用也受到了重视。同样，当海难发生时，如何快速的发现落水人员或物品是海上搜救的一个关键问题，即节点定位问题亟需解决。本文提出了一种利用直升机搭三个载锚节点实现节点3D定位的方法，即节点只要与直升机上的所有锚节点通信，便可实现其定位。仿真实验表明该定位方法能够节约节点定位所需要的时间，大幅提高定位率，能够较好的适应海上的恶劣环境，最终达到提高救援效率和成功率的目的。

英文摘要：

With the development of wireless sensor network （WSN）, WSN has been widely used in the environmental monitoring, health care, intelligent home appliances, etc. Meanwhile, maritime researchers pay attention to the application of WSN in maritime search and rescue （MSR）. It＆#39;s a permanent difficulty issue to quickly fix and rescue overboard persons or articles when ship disaster or accident happens. Therefore, a position fixing method named node localization algorithm about WSN is specially developed to overcome such a problem in this paper. This paper puts forward a 3D localization algorithm which a helicopter rides three anchor nodes to communication with the unknown nodes. At the end of this paper the simulation results show that this algorithm can get more accurate node location, and realize the real-time localization of the moving nodes, which may eventually improve the MSR efficiency and the success rate.