Question 814Navigation General

The correct answer is C) Speed. GPS receivers use the Doppler shift of the carrier phase to compute the speed of the receiver. The Doppler shift is a change in the observed frequency of a wave due to the relative motion between the transmitter and the receiver. By analyzing the Doppler shift of the GPS signals, the receiver can determine its own speed relative to the GPS satellites. The other options are incorrect because longitude and latitude are computed using the time of arrival and the position of the satellites, not the Doppler shift. Time is also not directly computed from the Doppler shift, but rather from the time of arrival of the GPS signals.