TRANSMITTER-RECEIVER CIRCUIT AND METHOD FOR DISTANCE MEASUREMENT BETWEEN A FIRST NODE AND A SECOND NODE OF A RADIO NETWORK

摘要

A transmitter-receiver circuit and a method for distance measurement between a first node and a second node of a radio network is provided, wherein a mode of the first node and a mode of the second node are switched from a normal mode for communication in the radio network to a mode for distance measurement, wherein, in the mode for distance measurement for a transit time measurement, a radio signal is transmitted by the first node and received by the second node and a radio signal is transmitted by the second node and received by the first node and a first distance value is determined by measuring the transit time of the radio signals. In the mode for distance measurement, for a phase measurement an unmodulated carrier signal is transmitted as a radio signal by the first node and received by the second node and an unmodulated carrier signal is transmitted as a radio signal by the second node and received by the first node and a second distance value is determined by measurement and calculation from four values of the phases for different frequencies of the radio signals. Whereby, the distance between the first node and the second node is calculated from the first distance value of the transit time measurement and the second distance value of the phase measurement.

主权项

1. A method for distance measurement between a first node and a second node of a radio network, the method comprising
switching a mode of the first node and a mode of the second node from a normal mode for communication in the radio network to a mode for distance measurement, transmitting a radio signal by the first node that is received by the second node and transmitting a radio signal by the second node that is received by the first node and determining a first distance value by measuring the transit time of the radio signals; transmitting a first unmodulated carrier signal by the first node that is received by the second node; transmitting a second unmodulated carrier signal by the second node that is received by the first node; measuring a first value and a second value of a first phase by the first node, the first value of the first phase being assigned to a first frequency of the received second carrier signal and the second value of the first phase being assigned to a second frequency of the received second carrier signal, the first frequency and the second frequency having a frequency difference; measuring a third value and a fourth value of a second phase by the second node, the third value of the second phase being assigned to a third frequency of the received first carrier signal and the fourth value of the second phase being assigned to a fourth frequency of the received first carrier signal, the third frequency and the fourth frequency having the frequency difference; determining a second distance value from the frequency difference from the first value and the second value of the first phase and from the third value and the fourth value of the second phase; and calculating the distance between the first node and the second node from the first distance value and the second distance value.