Propagation time measurement device and electronic key system

摘要

A propagation time measurement device measures a propagation time of a transmission signal from when the transmission signal is transmitted, through wireless communication, from a base station to a terminal to when the transmission signal is returned to the base station from the terminal. Continuous waves having different frequencies are combined to generate the transmission signal. The propagation time measurement device includes a correlation computation unit that generates correlation values by performing a correlation computation on each of the continuous waves and a reception signal that is returned from the terminal and received by the base station. A propagation time measurement unit measures the measurement time from a phase of the correlation value generated for each continuous wave during the correlation computation.

主权项

1. A propagation time measurement device that measures a propagation time of a transmission signal from when the transmission signal is transmitted, through wireless communication, from a base station to a terminal to when the transmission signal is returned to the base station from the terminal, wherein a plurality of continuous waves having different frequencies are combined to generate the transmission signal, the propagation time measurement device comprising:
a correlation computation unit that generates a plurality of correlation values by performing a correlation computation on each of the continuous waves and a reception signal that is returned from the terminal and received by the base station; and a propagation time measurement unit that measures the propagation time from a phase of the correlation value generated for each continuous wave in the correlation computation.