中文摘要：

介绍了定位系统的发展现状和业务流程,提出并建立了当被监护人离开安全范围后的应急定位策略模型,可以智能地为监护人提供更充分的位置信息,最后给出了研究结论。

英文摘要：

The development status and business processes of positioning system were introduced. The emergency locator policy model after the ward leaving safe range was proposed and established, which can provide adequate position information for the guardian intelligently. Finally, the research conclusion was given.