The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 2015
Filed:
Jul. 02, 2010
Junichi Miyamoto, Tokyo, JP;
Hiroshi Kajitani, Tokyo, JP;
Junichi Miyamoto, Tokyo, JP;
Hiroshi Kajitani, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A position detection system, includes at least one moving body (MB) including a transmission device simultaneously emitting a trigger signal indicating transmission timing and an ultrasonic signal obtained by modulating a signal of a frequency as a reference by pseudo random sequence data having high self-correlativity, and a reception device detecting MB position. The reception device includes ultrasonic reception units, a unit calculating a correlation value between a waveform of the ultrasonic signal and a model waveform of the pseudo random sequence, a unit subjecting the waveform of the ultrasonic signal and the model waveform to calculate a correlation value between the two waveforms, a unit calculating a propagation time of each ultrasonic to arrive at each of the ultrasonic reception units from trigger signal reception to correlation peak detection, and a unit calculating MB position from the ultrasonic propagation time and the interval length between the ultrasonic reception units.