Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

None of these
Constant in time and space
Constant in space
Constant in time

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Elements Of Remote Sensing
Which one of the following residual biases involves the GPS accuracy?

Satellite dependent biases due to uncertainty in the orbital parameters of the satellite
Receiver-dependent biases due to clock stability with line
All listed here
Signal propagation biases due to the sphere and troposphere propagation

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