Question

Which among the following is the first step in the determination of position using time difference of arrival?

(a) Time tag the transmitted signal

(b) Solving for the position of source transmitter

(c) Determining the time difference of arrival curve

(d) Conversion to a common coordinate system

This question was addressed to me during an online exam.

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

Answer 1

Correct answer is (a) Time tag the transmitted signal

The best explanation: The hyperboloid curve of time difference of arrival approach is drawn by considering the speed of propagation and difference between the arrival times of the same signal at two receivers. To expand the curve to include three receivers, the results are converted to a common coordinate system. Finally, the curve equations are solved to identify the position of the source.