satellite exchange

Today, more people than ever before are speaking to each other through satellite television, cellular telephones and computers. They are ready to exchange their calling cards only after they have talked agreeably and wish to continue their associations.

现在透过卫星电视、行动电话和计算机来交谈的人要比以往来得多。只有当双方谈话投机，希望继续交往时，才会主动掏出名片。

Case 1: when there is no relative measurement, each satellite uses its own on-board attitude sensors to determine its attitude, and exchange the information through the communication link between formation satellites, and then the relative attitude is determined through simple mathematical operation.

方案一，在星间无相对测量时，由卫星自身携带的姿态敏感器实现单星高精度姿态确定，利用星间通信链路进行信息交互，通过简单的数学计算获得星间相对姿态；

In exchange for free social networking, emails, videos, search, satellite maps and now telephone calls, they are building your profile in ever more granular detail.

它们以免费的社交网络、电邮、视频、搜索、卫星地图、以及眼下的免费电话作为交换，正在以更加细致入微的细节来建立你的个人信息。