Title:
POSITION DETECTION SYSTEM, TRANSMISSION DEVICE, RECEPTION DEVICE AND POSITION DETECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2011/007685
Kind Code:
A1
Abstract:
The positions of a plurality of transmission devices are accurately detected by a direct wave which arrives first at a reception device without being affected by other ultrasonic signals from the transmission devices.
Specifically disclosed is a position detection system provided with a mobile object which includes a transmission device that simultaneously transmits a trigger signal and an ultrasonic signal obtained by modulating a signal with a frequency used as a reference on the basis of pseudorandom sequence data with high autocorrelativity, and a reception device which detects the position of the mobile object, wherein the reception processing device includes a means for filtering the reception waveform of the ultrasonic signal and a pseudorandom sequence model waveform that is predetermined according to the mobile object, and calculating a correlation value between both the waveforms, a means for calculating, from a point in time when the trigger signal is received and a point in time when the first peak value of the correlation value is detected, the ultrasonic propagation times that the ultrasonic signal takes to reach two ultrasonic reception means, and a means for calculating the position of the mobile object on the basis of the ultrasonic propagation times and the interval length between the ultrasonic reception means, and a different sequence having low cross correlation is used as the pseudorandom sequence.
Inventors:
MIYAMOTO, Junichi (7-1 Shiba 5-chome, Minato-k, Tokyo 01, 〒1088001, JP)
宮本 潤一 (〒01 東京都港区芝五丁目７番１号 日本電気株式会社内 Tokyo, 〒1088001, JP)
宮本 潤一 (〒01 東京都港区芝五丁目７番１号 日本電気株式会社内 Tokyo, 〒1088001, JP)
Application Number:
JP2010/061318
Publication Date:
January 20, 2011
Filing Date:
July 02, 2010
Export Citation:
Assignee:
NEC CORPORATION (7-1 Shiba 5-chome, Minato-ku Tokyo, 01, 〒1088001, JP)
日本電気株式会社 (〒01 東京都港区芝五丁目７番１号 Tokyo, 〒1088001, JP)
MIYAMOTO, Junichi (7-1 Shiba 5-chome, Minato-k, Tokyo 01, 〒1088001, JP)
日本電気株式会社 (〒01 東京都港区芝五丁目７番１号 Tokyo, 〒1088001, JP)
MIYAMOTO, Junichi (7-1 Shiba 5-chome, Minato-k, Tokyo 01, 〒1088001, JP)
International Classes:
G01S5/30; G01B17/00; G01S11/16; G06F3/043
Attorney, Agent or Firm:
MATSUMOTO, Masao (2910, West Park Tower Ikebukuro 21-13, Nishi-Ikebukuro 3-chome, Toshima-k, Tokyo 21, 〒1710021, JP)
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