A regional satellite navigation system which is made up of geosynchronous satellites and synchronous satellites with elliptical orbit is proposed.

提出了一种用静止卫星和同步椭圆轨道卫星构造的区域卫星定位系统。

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Interference to CSRH and forecast from synchronous orbit satellite, and interference due to low and middle orbit satellite are analysed.

计算了同步卫星干扰及干扰时间预测，也分析了中低轨道卫星干扰问题。

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The 600-plus-kilogram satellite will circle the Earth once every 90 minutes after it enters a sun-synchronous orbit at an altitude of 500 kilometers.

墨子号质量在600千克以上，进入距地面高度500公里的太阳同步轨道后，每90分钟环绕地球一圈。

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Unless someone with lots of money wants to fund the project, I can imagine no way for hackers to orbit a sun-synchronous satellite and covering the world would require several to offer low-cost Internet to the censored masses.

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To do this the satellite would need to be in a synchronous orbit (one whose orbital period is the same as the period of revolution of the planet underneath), and the descending cable would have to be counterbalanced by an ascending one extending off into space.

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