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为了提高车辆定位精度,提出了一种基于RFID的车辆辅助定位方法。车辆获得两个不同的位置数据:从车辆GPS接收器获得GPS坐标和通过RFID通信获得准确物理位置。通过这两个数据计算GPS误差,最后比较相邻数据来改正有误差的GPS坐标。车辆可以作为一个基站,与基站相邻的车辆可以利用基站传来的误差对车辆进行精确定位。为了减小由于信噪比变大造成的车辆位置精度下降,基于复合二次函数模型确定出加权系数,利用一种改进的加权系数方法校正了偏移误差。仿真试验结果表明:提出的基于RFID的辅助定位方法在城市道路上能获得准确的车辆位置,可以满足在车联网环境下的车辆定位精度需求。
In order to improve vehicle positioning accuracy, a vehicle-based positioning method based on RFID is proposed. The vehicle obtains two different location data: obtaining GPS coordinates from the vehicle GPS receiver and obtaining an accurate physical location via RFID communication. Calculate the GPS error from these two data and finally compare the neighboring data to correct the GPS coordinates with errors. The vehicle can be used as a base station. Vehicles adjacent to the base station can utilize the error from the base station to accurately locate the vehicle. In order to reduce the decrease of vehicle position accuracy caused by the increase of signal-to-noise ratio, the weighting coefficient was determined based on the compound quadratic function model and the offset error was corrected by an improved weighted coefficient method. The simulation results show that the proposed positioning method based on RFID can get the accurate vehicle position on the urban road, which can meet the vehicle positioning accuracy requirement in the car networking environment.