Ranging for wireless radio communication devices

摘要

A ranging device comprises:
an RF system integrated on a chip and including a preamble correlator providing a start of frame delimiter (SFD) indicator and a transmitter providing an indication of time of sending (TOS) a packet;
a timing unit coupled to said preamble correlator to receive said indication of said SFD and to said transmitter to receive said indication of TOS;
a range calculator coupled to said timing unit to receive said SFD and said TOS, said range calculator providing an estimate of distance to a target determined, in part, on a time difference between said SFD and said TOS.