SECURE RANGING

Abstract

A method of secure wireless ranging between a verifier node and a prover node comprises, for each frequency in a plurality of frequencies, performing a measurement procedure resulting in a two-way phase measurement and a round-trip time measurement between the verifier node and the prover node, the measurement procedure comprising the verifier node transmitting on the frequency a verifier packet comprising a verifier carrier signal and a verifier frame delimiter, the prover node receiving the verifier packet and performing a phase measurement of the verifier carrier signal and a time-of-arrival measurement of the verifier frame delimiter, the prover node transmitting on said frequency, a prover packet comprising a prover carrier signal and a prover frame delimiter, and the verifier node receiving the prover packet and performing a phase measurement of the prover carrier signal and a time-of-arrival measurement of the prover frame delimiter, wherein each the verifier frame delimiter and each the prover frame delimiter comprises a respective authentication code, wherein the authentication code is based on key a commonly known by the verifier node and the prover node, the method further comprising: calculating a distance between the verifier node and the prover node based on the two-way phase measurements and the round-trip time measurements for the plurality of frequencies, wherein each the carrier signal is authenticated based on each corresponding the authentication code of the corresponding the frame delimiter and the commonly known key.

IPC Classifications