Two way ranging is a concept with time of arrival measurement for wireless signals. When synchronisation of the oscillators of the involved transmitters is not viable, hence the clocks differ, then applying the measurement as a two ways travel to the receiver and mirrored back to the transmitter compensates for some of the phase differences between the oscillators involved. This concept is applied with the RTLS concept as defined in the international standard ISO/IEC FCD 24730-5 . Literature A first description of the concept is given with . In contrast to some faulty explanations, the concept may be applied as well with IEEE 805.15.4aCSS as with IEEE 805.15.4aUWB modulation .
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