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地球同步卫星

地球同步卫星的示意图。

地球同步卫星(英语:geosynchronous satellite)是一种永远固定在地球上空某个位置,或在地球上空某个位置附近周期运动的卫星。必须和地球自转周期时间一样,绕一圈地球的时间是23小时又56分4秒(以恒星日为准),同时高度需维持在35776公里左右。

应用

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同步轨道的容量有限,是兵家必争之地, 在早期是通讯卫星专用,不管是商业通讯卫星还是战术通讯卫星, 以前因为定位技术不足,限制每两度角安置ㄧ颗卫星,后来技术提升变成一度角ㄧ颗, 预定废弃的卫星会推到更高的轨道弃置。

截至2015年 (2015-Missing required parameter 1=month!),有411颗的地球同步卫星[1],包括了通讯、电视广播、天气预测,以及国防应用。

参见

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参考资料

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  1. ^ Satellites in Clarke Belt. 2015-06-22 [2018-05-28]. (原始内容存档于2018-06-07). 

外部链接

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地球同步卫星
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