What is the increase in velocity of the signal by the ionosphere termed as?(a) Differential velocity(b) Velocity advance(c) Phase advance(d) Signal advanceI had been asked this question in unit test.I'm obligated to ask this question of Atmospheric Effects on Satellite Signals topic in portion Satellite Radio Navigation& Inertial Navigation of Avionics

What is the increase in velocity of the signal by the ionosphere terme

1.	What is the increase in velocity of the signal by the ionosphere termed as?(a) Differential velocity(b) Velocity advance(c) Phase advance(d) Signal advanceI had been asked this question in unit test.I'm obligated to ask this question of Atmospheric Effects on Satellite Signals topic in portion Satellite Radio Navigation& Inertial Navigation of Avionics
Answer» Correct option is (c) Phase advance For explanation I would say: The result of satellite SIGNAL travelling through ionosphere is that a particular phase of the signal ARRIVES at the RECEIVER earlier than it would have had if the signal travelled in a complete vacuum. This early arrival is termed as phase advance.

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