Elements Of Remote Sensing
Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

Four ground stations
Three ground stations
Five ground stations
Six ground stations

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Elements Of Remote Sensing
Geodimeter is based on:

High frequency radio waves
The visible light as carrier with frequency of the order of 5 × 1014 Hz
Propagation of modulated light waves
Propagation of infrared radiation

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