METHOD AND APPARATUS FOR DETERMINING DISTANCES BETWEEN WIRELESS COMMUNICATION DEVICES USING LOW FREQUENCY SIGNALS

摘要

A wireless device for determining distances between other wireless communications devices in a wireless communication network The wireless device receives an incoming message signal from at least one other wireless device in the network The message signal includes a fame of arrival of a ranging signal previously transmitted by the wireless device Responsive to receiving the message signal, the wireless device receives one or more incoming ranging signals from the other wireless device Each ranging signal is received in a frequency range that is substantially less than the frequency range in which the messaging signal was received