Which of the following are inputs to a satellite tracking program?
The satellite transmitted power
The Keplerian elements✓Ճիշտ պատասխան
The last observed time of zero Doppler shift
All these choices are correct
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Keplerian elements are the set of numbers that describe the orbit's size, shape and orientation at a reference time, and they are exactly what the program needs, together with your location and the clock, to compute where the satellite is. Transmitted power is irrelevant to position, and Doppler is an output of the calculation rather than an input.