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:
May. 05, 2020
Filed:
Feb. 16, 2016
Guangzhou Hkust Fok Ying Tung Research Institute, Guangzhou, Guangdong, CN;
Ran Zhao, Guangdong, CN;
Tao Zhang, Guangdong, CN;
Zhouhong Wang, Guangdong, CN;
Min Gao, Guangdong, CN;
GUANGZHOU HKUST FOK YING TUNG RESEARCH INSTITUTE, Guangzhou, CN;
Abstract
The present invention discloses a method for real-time positioning of a smart device, comprising: getting tri-axial acceleration sequences truncated in turn by using a preset time period in the world coordinate individually; acquiring a dominate frequency fby applying fast Fourier transform (FFT) on the truncated Z-axis acceleration sequence, using a band-pass filter with a pass band [f−0.5 Hz, f+0.5 Hz] to filter the truncated tri axial acceleration sequences individually; comparing the time domain waveform form from the filtered Z-axis acceleration sequence with a preset step threshold, and counting each peak above the threshold as a step to acquire a user's step number in the present time period; determining the moving direction of the smart device in the time period by calculating the filtered X-axis and Y-axis acceleration sequences; determining the current position of the smart device by calculating the user's step number and the moving direction of the smart device.