在某些情况下，卫星星座需要对全球地面目标进行访问，但对连续性覆盖要求不高，只要满足一定的访问间隔时间限制，访问时相比较均匀即可。

In some cases, constellations are required to visit any ground targets in the globe. It does not need continuous coverage, but just satisfying limits of certain revisit time and even temporal phases.

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