Wireless distance measurement system and wireless distance...

Details Wireless distance measurement system and wireless distance... Wireless distance measurement system and wireless distance...

2011-01-11

2011-01-11

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Navigational

C342S042000, C342S030000, C455S007000

Reexamination Certificate

active

07868815

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.

REFERENCES:
patent: 6757054 (2004-06-01), Watanabe et al.
patent: 2004/0157621 (2004-08-01), Yamasaki
patent: 2004-242122 (2004-08-01), None

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