In Chapter One, the present studies on single-observer passive location and tracking are reviewed. Several overseas experiment systems and existing passive locating methods are introduced.
全文共分七章： 第一章综述了单站无源定位跟踪的研究现状，介绍了国外现有的几种单站无源定位实验系统，对比评述了现有的单站无源定位跟踪方法，指出了各自的优缺点。
参考来源 - 空中观测平台对海面慢速目标单站无源定位跟踪及其关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The Observer pattern is associated with a single source of events, however, whereas the Reactor pattern is associated with multiple sources of events.
不过，观察者模式与单个事件源关联，而反应器模式则与多个事件源关联。
The Reactor pattern is closely related to the Observer pattern in this aspect: all dependents are informed when a single subject changes.
反应器模式与观察者模式（Observer pattern）在这个方面极为相似：当一个主体发生改变时，所有依属体都得到通知。
In this paper, the single observer-passive location method using phase difference change rate is introduced based on existing methods.
该文在现有单站无源定位方法的基础上，介绍了相位差变化率定位法。
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