RANGING METHOD FOR MEASURING DISTANCE BETWEEN A CENTRAL NODE AND AN EQUIPMENT NODE IN BEACON WIRELESS PERSONAL AREA NETWORK

摘要

The present invention relates to a ranging method for measuring distance between a central node and an equipment node in beacon wireless personal area network, which belongs to the technical field of wireless communication. Firstly, at the beginning stage, the central node calculates the parameters needed in the ranging operation and sends these parameters to the equipment nodes by beacon frames. Equipment nodes in turn send ranging frames at time slots distributed to them according to the information received in the beacon frames. The central node calculates beacon frame flight time by recording the sending time and the arrival time of the ranging frame, and then calculates the distance between the central node and the equipment node. For the nodes failing in the ranging program, the ranging parameters will be changed according to the failing reasons and above program will be repeated till ranging result is received without failure. In the present invention, high precise ranging is achieved by calculating the flight time of electromagnetic wave, equipment nodes that are temporarily not engaged in ranging operation will directly get into dormancy state, which greatly reduces the consumption of electric energy, as well as ranging efficiency is improved because of the proper arrangement of the time slots.