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Global Positioning System uses ____ to determine geo-location of receiver.

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Global Positioning System uses ____ to determine geo-location of receiver.

(a) time of arrival

(b) time difference of arrival

(c) time of arrival and angle of arrival

(d) time difference of arrival and angle of arrival

I had been asked this question by my college professor while I was bunking the class.

I'm obligated to ask this question of Available Technologies for Cognitive Radio topic in division Cognitive Radio Basics of Cognitive Radio

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Right choice is (b) time difference of arrival

Explanation: Global Positioning System is a satellite based radio navigation system. It offers a resolution of 100m and requires unobstructed line of sight from satellites. It uses time difference of arrival to determine geo-location of receiver.

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