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What curve is obtained by plotting the time difference of arrival?

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What curve is obtained by plotting the time difference of arrival?

(a) Parabola

(b) Sphere

(c) Hyperbola

(d) Ellipse

I have been asked this question in an interview for internship.

This key question is from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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Correct choice is (c) Hyperbola

The explanation: The time difference of arrival approach involves computing the time difference between the reception of a signal at one location and the reception of the same signal at a different location. The plot of time difference of arrival produces a hyperboloid surface with its foci at the two receivers.

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