以海上目标监视与打击体系为例，给出利用UML中的用例图、类图、活动图、协作图对体系顶层需求进行描述的方法。
Taking sea target surveillance and hitting system for example, the top-level demands are described using user case diagram, class diagram, activity diagram and collaboration diagram in UML.
提出了分布式空间目标监视系统概念，对空间目标光学可见性进行了分析，根据任务要求设计了分布式卫星系统的轨道和构型。
The concept of distributed space surveillance system was presented, the elements and detection method for space target sensor were studied, and the orbit and configuration of the system were designed.
如果必须使用这个新功能，建议为需要监视的每个接口指定尽可能多的目标。
If you must use this new function, I recommend that you include as many targets as possible for each interface you need to monitor.
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