Whole-network traffic speed estimation method based on full space-time coverage

The invention discloses a whole network traffic speed estimation method based on whole space-time coverage. The method comprises the following steps: S1, constructing a kernel function by using graph information; s2, constructing a graph Gaussian process, and obtaining correlation between road sections; and S3, calculating the posteriori of the Gaussian process of the graph by using variational reasoning so as to obtain the traffic speed estimation value of the whole network. According to the method, reasonable modeling is carried out on propagation and inference of traffic network topology characteristics and traffic speed by researching the traffic states of the road sections in the network, the full space-time traffic state of the traffic network with only partial data input is accurately estimated, and a scientific basis is provided for a traffic management department to formulate a congestion relieving strategy. 本发明公开了一种基于全时空覆盖的全网交通速度估计方法，包括如下步骤：S1.利用图信息构建核函数；S2.构建图高斯过程，获取路段间的相关性；S3.使用变分推理计算图高斯过程的后验，从而得到