With Sentinel-2C now in orbit, it will soon replace its predecessor, Sentinel-2A, following a brief period of tandem observations. Sentinel-2D will eventually take over from Sentinel-2B. Later, it is planned that the Sentinel-2 Next Generation mission will then ensure data continuity beyond 2035.
Sentinel-2C also reinforces Copernicus, the world’s most advanced Earth Observation system, by ensuring system redundancy and resilience – as an example, incase of unavailability of one of the other two satellites.
目前采访的信息透露，"串联观测"，"系统冗余和弹性",我猜测应该是这样的:
2A与2B相位相差 180°,2C则是插入中间，2C与2A和2B相差90°
四、升级
While the resolution and number of bands are identical to its predecessors and users will not see any difference in the products, there is something novel about Copernicus Sentinel-2C.
To determine the satellite’s location in space, its onboard satellite navigation system (GNSS) is relied on.
While the previous receiver was compatible only with GPS, the new one is also compatible with Galileo, the European Global Navigation Satellite System (GNSS).
By receiving signals from both constellations, the navigation experience will be more robust and slightly more accurate.
Another advantage is that the mission can now operate independently from GPS, incase it (GPS) becomes unavailable, increasing European autonomy and resilience in space, the EC said.
