Patent ID: 9499184
Filing Date: 2016-11-22
CPC Classification: B61L

Claim Text:
1. A method of determining a position of a vehicle on a guideway, the method comprising: receiving a first non-modulated reflection signal by a first antenna on-board the vehicle, the first non-modulated reflection signal being associated with a first reflective positioning element along the guideway; receiving the first non-modulated reflection signal by a second antenna on-board the vehicle; determining a difference between the first non-modulated signal received by the first antenna and the first non-modulated signal received by the second antenna; detecting a position of the vehicle relative to the first reflective positioning element along the guideway based on the difference between the first non-modulated signal received by the first antenna and the first non-modulated signal received by the second antenna; detecting a unique identification code of a transponder along the guideway, wherein the transponder is located a first known distance along the guideway from the first reflective positioning element; and determining the position of the vehicle on the guideway, using a position determining system, based on a modulated reflection signal received from the transponder, the position of the vehicle relative to the first reflective positioning element, and the first known distance.