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:
Dec. 04, 2012
Filed:
Mar. 31, 2006
Kazuo Ogoro, Tokyo, JP;
Kazuo Ogoro, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A portable wireless terminal and a moving velocity detecting method for the portable wireless terminal capable of detecting a moving velocity with high accuracy without increasing power consumption and terminal cost are provided. At the start of a communication, GPS reception-related circuitsandare turned on, an initial position of a portable wireless terminalis detected, a RAKE receiverand a synchronous detectormeasure Doppler shift amounts of down signals at a known frequency received from a plurality of base stations, respectively, and a CPUcalculates relative velocities of the portable wireless terminalto the respective base stations and obtains a current moving velocity of the portable wireless terminalfrom positions of the base stations, the initial position, and the relative velocities. The current position is calculated from the initial position and the current moving velocity, and sequentially updated to be used in place of the initial position at the time of calculating the moving velocity next time. The initial position at the start of the communication may be obtained by using a W-LAN, an RFID system, a wireless IC card or user input information instead of using a GPS.