2.In a UHF passive RFID system, a reader transmits an unmodulated continuous wave (CW) to tags, which not only provides energy to tags but also serves as the carrier of tag backscatter signals.
7.As they towed it, they sent radar pulses on the frequency bands used by the satellites downwards into the snow and measured the amount of backscatter.
8.The deflection of the signals in this backscatter gives a picture of how particular snow conditions might be changing the way the satellite's radar is returned.
9.The amount of X-ray radiation you're exposed to in a backscatter scan is extremely low, a tiny fraction of the amount you're about to be exposed to by flying on a plane.