Patent ID: 8165248

Claim:
A wireless distance measurement system that comprises a wireless base station and a wireless terminal and that measures a distance between the wireless base station and the wireless terminal using a pulse signal, wherein: the wireless terminal comprises: a receiving section that receives a pulse signal sequence transmitted from the wireless base station; a detector that detects the received pulse signal sequence and outputs a detection signal; a synchronization establishing section that comprises: an integrator that integrates the detection signal per receiving timing candidate and outputs an integration result; and a detecting section that detects a synchronization timing with the wireless base station based on the integration result; and a distance measurement processing section that comprises: a holding section that holds the integration result; a comparator that outputs a binary signal matching an input signal using the integration result held in the holding section as reference data; and a pulse generating section that generates a transmission pulse signal based on the binary signal outputted from the comparator; the wireless base station comprises a calculating section that measures a time lag between a transmission timing for the pulse signal sequence and a receiving timing for a pulse signal sequence transmitted from the wireless terminal based on a pulse signal transmitted at the transmission timing, and calculates the distance based on the measured time lag; and a route of signals varies between a distance measuring operation and a synchronization establishing operation in the wireless terminal, and, when the distance measuring operation is performed, the detection signal is inputted to the comparator without passing through the integrator.