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:
Sep. 25, 2012
Filed:
May. 30, 2009
Kyung Hwan Park, Daejeon, KR;
Tae Young Kang, Seoul, KR;
Seok Bong Hyun, Daejeon, KR;
Sung Weon Kang, Daejeon, KR;
Byoung Gun Choi, Daegu, KR;
IN Gi Lim, Daejeon, KR;
Kyung Soo Kim, Daejeon, KR;
Jung Bum Kim, Daejeon, KR;
Kyung Hwan Park, Daejeon, KR;
Tae Young Kang, Seoul, KR;
Seok Bong Hyun, Daejeon, KR;
Sung Weon Kang, Daejeon, KR;
Byoung Gun Choi, Daegu, KR;
In Gi Lim, Daejeon, KR;
Kyung Soo Kim, Daejeon, KR;
Jung Bum Kim, Daejeon, KR;
Electronics and Telecommunications Research Institute, Daejeon, KR;
Abstract
A technique for simultaneously acquiring vehicle identification information and speed information of an RFID tag-attached vehicle by calculating the vehicle speed by using a Doppler shift value extracted from transmission and reception signals between the RFID tag and the RFID reader is disclosed. A method for measuring a vehicle speed by using an RFID reader installed right up on the road or at the roadside includes: transmitting a continuous wave; receiving a reflected wave with respect to the continuous wave from an RFID tag attached to a vehicle which has received the continuous wave; extracting a Doppler shift value from the continuous wave and the reflected wave; and calculating the speed of the vehicle by using the Doppler shift value.