RANGING AND POSITIONING SYSTEM

摘要

A ranging and positioning system comprising transmitters and receiver nodes communicating together by chirp-modulated radio signals, that have a ranging mode in which ranging exchange of signals takes place between a master device and a slave device that leads to the evaluation of the range between them. The slave is arranged for recognizing a ranging request and transmit back a ranging response containing chirps that precisely aligned in time and frequency with the chirps in the ranging requests, whereupon the master can receive the ranging response, analyze the time and frequency the chirps contained therein with respect to his own time reference, and estimate a range to the slave.

主权项

1. A system comprising at least a transmitting device and a receiving device, each device comprising a time reference and being arranged for transmitting and receiving radio signals that include a plurality of chirps, wherein each chirp is limited in time between an initial instant, at which the signal has an initial instantaneous frequency and a final instant at which the signal has a final instantaneous frequency, said initial and final instants and said initial and final frequencies being determined by the time reference, said devices having a ranging mode, in which a ranging request is transmitted from the transmitting device to the receiving device, and wherein the receiving device is arranged for receiving the ranging request and for determining the time and frequency shifts of the time reference of the receiving device with respect to the time reference of the transmitting device, based on the time and frequency of chirps contained in the ranging request.