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Which among the following is not an example for electromagnetic sensors?

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Which among the following is not an example for electromagnetic sensors?

(a) Antenna

(b) CCD sensors

(c) RF sensors

(d) Anisotropic magneto resistance sensors

I got this question by my college professor while I was bunking the class.

This interesting question is from Location Awareness in chapter Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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The correct choice is (b) CCD sensors

The best explanation: Electromagnetic sensors are used to convert electromagnetic signals into electrical signals. Antenna is the most commonly used radio sensing sensor. Location information is obtained from received signal statistics such as time of arrival in antenna based wireless positioning system.

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