Method of using a ranging system to determine the location of a node relative to a beacon

摘要

A method of using a ranging system for communicating between an end user node and controller to determine the location of the end user node relative to a beacon. The controller transmits an inquiry message to the end user node with a minimum received signal strength indicator (RSSI) message that includes a threshold for transmitting a reply message. When the measured RSSI of the inquiry message exceeds the RSSI threshold, the controller receives a reply message from the end user node, including the measured RSSI.

主权项

1. A method for communicating between an end user node and a control station controller used in determining a location of the end user node relative to a beacon, comprising:
transmitting an inquiry message from the controller to the end user node with minimum received signal strength indicator (RSSI) message, wherein the minimum RSSI message includes a RSSI threshold for transmitting a reply message from the end user node; receiving a reply message at the controller from the end user node including a measured RSSI of the inquiry message at the end user node when the measured RSSI of the inquiry message exceeds the RSSI threshold; incrementing to a next segment in a plurality of segments of a scan after a maximum segment time, wherein each segment of the plurality of segments uses a different radio frequency (RF) phased-array narrow beam for transmitting the inquiry message and receiving the reply message, and the maximum segment time provides a specified dwell time interval for transmitting the inquiry message and receiving the reply message; and transmitting the inquiry message and receiving the reply message for the next segment.