未指定特定系统的，数据电文进入收件人的任何系统的首次时间，视为该数据电文的接收时间。

If no given system is designated, the time when the data message enters into any system of the addressee for the first time shall be regarded as the time for receiving the data message.

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因此，GPS差分协议和差分电文的算法是差分系统必须考虑的两个问题。

So the DGPS data formats and base station algorithm are the two important problems of DGPS system.

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在这类系统设计中，电文碰撞规律是涉及到系统容量的重要问题。本文在古典概率的基础上，经适当修改，得到符合计算机模拟结果的理论公式。

For the design of the systems, the law of message collision which is concerned with the capacity of the systems is an important problem.

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