Discussion
What is time domain gating used for in antenna measurement?
Answer: D
Transforming a swept frequency measurement to the time domain separates the direct path from later reflections, which can then be windowed out before transforming back. It allows respectable measurements in rooms that are far from anechoic. Impulse response is what the transform shows rather than the purpose, and synchronisation and averaging are separate features of the instrument. Separating signals by arrival time is the same principle radar uses, applied here to a metrology problem.
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