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Range-Based and Range-Free Localization Schemes for Sensor Networks - page 34 / 37

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How SerLoc works

Node i claims its location is (x, y)

Node i needs to send (x, y) a location verification request msg to a nearby verifier

A verifier can be a normal sensor node

The verifier sends a random nonce to node i and start the clock

Node i has to immediately return the challenge through both radio and ultrasonic channels

The verifier measures the time for node i returning the challenge and take the difference between the radio & ultrasonic signal propagation. Based on this observation, verify the claimed location   

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