基于GPS的实时交通信息采集方法的研究

对基于GPS的实时交通信息采集方法开展研究,分别提出了利用GPS返回的经纬度数据和速度数据的两种路段平均速度估计算法。前者通过高斯投影,将WGS-84坐标系的GPS经纬度数据转换为平面直角坐标系的数据,从而计算平均速度。后者从GPS单点测速机理的研究入手,通过速度定积分计算距离得到平均速度。通过现场试验对算法和技术流程进行了验证,并利用实测数据对比了两种算法的计算结果,表明基于GPS的实时交通信息采集技术在实践中是可行和有效的。

Study 0n GPS-based Real-time Traffic Information Collection Method

The real-time traffic information collection method based on GPS is studied. Two segment average speed estimation algorithms are proposed based on the longitude, latitude and speed data collected by GPS receiver. In the first one, the longitude and latitude data in WGS- 84 are transformed into the data in two-dimensional rectangular coordinate through the Gauss projection coordinate transformation, and the average speed estimation is achieved. In the second one, from the study on the mechanism of velocity determination using GPS, the average speed estimation is achieved through the definite integral of velocity. The algorithms and technical process are validated through the field experiments, and the computation results of two algorithms are compared using the field data. It is indicated that real-time traffic information collection method based on GPS is feasible and effective in practice.