Visualization window, communication window and communication constraint satisfied over-time between satellites and space station were presented according to the characters of two-station-system.

针对双基站卫星星座的特点，分析了卫星和空间站之间的可视窗、通讯窗和过顶时间要求下的通讯约束。

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"Studies show that Northampton Station is already at capacity during peak hours, while the station building and its associated facilities are out-of-date, and a constraint to economic growth, " WNDC said.

BBC: Designs for Northampton railway station