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____ may be used in passive self-location awareness approach.

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____ may be used in passive self-location awareness approach.

(a) Cognitive sonar

(b) Image sensor

(c) Infrared sensor

(d) Hall sensor

I got this question in an international level competition.

Enquiry is from Environment Awareness topic in division Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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The correct answer is (b) Image sensor

To elaborate: Passive self-location awareness approach involves observing the environment and capturing desired signals without transmitting signals into the environment. Human vision is an example of the approach in nature.

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