Two-dimensional vehicle positioning method in tunnel environment and based on radio frequency identification

The invention discloses a two-dimensional vehicle positioning method in a tunnel environment and based on radio frequency identification. A radio frequency identification (RFID) technology is adopted in the urban tunnel environment and combined with an RFID positioning algorithm and a constrained optimization algorithm to position a vehicle, so that accuracy of vehicle positioning is improved, and two-dimensional position information of the vehicle in the tunnel environment can be accurately estimated in real time. The two-dimensional vehicle positioning method has the remarkable advantages of being high in positioning speed and accuracy, good in real-time performance and the like.