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Elements of Remote Sensing - Engineering

Q1:

Due to pertubation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

A six ground stations

B five ground stations

C four ground stations

D three ground stations

ANS:B - five ground stations

There is no doubt in having "ground stations" to correct or bring back a satellite to its desired orbit. But the number of ground stations. 6, 5, 4, 3.

I feel It depends on the technology.