Title:
無線測距システム及び無線測距方法
Document Type and Number:
Japanese Patent JP5173623
Kind Code:
B2
Abstract:
A wireless distance measurement system and a wireless distance measurement method that measure the distance between a base station and a terminal without clock synchronization between a plurality of base stations, and without requiring input of the position relationships between a plurality of base stations. Clock phase shift section (210) shifts a clock that is used to generate transmission pulses is phase-shifted by a specific amount every 100 nanoseconds, and A/D conversion section (211) converts a signal re-radiated from terminal (103) to a digital signal using the shifted clock. Correlation calculation section (212) performs correlation calculation between the digital signal and the transmission pulse and creates a delay profile by adding digital signals in the shifted phases between same phases, and incoming wave detection section (213) detects peaks of the pulses in the delay profile. Distance calculation section (214) calculates the distance to terminal (103) based on the timings to transmit the pulses and the timings to detect peaks of the pulses.
Inventors:
Takashi Fukagawa
Hiroto Mukai
Yoichi Nakagawa
Inoue Tadao
Hiroto Mukai
Yoichi Nakagawa
Inoue Tadao
Application Number:
JP2008160444A
Publication Date:
April 03, 2013
Filing Date:
June 19, 2008
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
G01S7/28; G01S13/76; G01S7/282
Domestic Patent References:
| JP2004085545A | ||||
| JP2002267752A | ||||
| JP2008085558A | ||||
| JP2006510001A | ||||
| JP2006503273A | ||||
| JP2006503272A |
Attorney, Agent or Firm:
Koichi Washida