摘要
针对不同时间道路车流量变化下轨迹预测误差变化大的问题,提出基于概率分布模型的高斯混合时间序列模型(GMTSM),对海量车辆历史轨迹进行模型回归和路段车流量的分析以实现车辆轨迹预测。首先,针对均匀网格划分方法容易造成相关轨迹点分裂的问题,提出迭代式网格划分来实现轨迹点的数量均衡;其次,训练并结合高斯混合模型(GMM)和时间序列分析中的差分自回归滑动平均模型(ARIMA);然后,为了避免GMTSM中子模型自身的不稳定性对预测结果产生干扰,对子模型的预测进行误差分析,动态计算子模型的权重;最后,依据动态权重组合子模型实现轨迹预测。实验结果表明,GMTSM在路段车流量突变情况下,平均预测准确率为90.3%;与相同参数设置下的高斯混合模型和马尔可夫模型相比,GMTSM预测准确性提高了55%左右。GMTSM不仅能在正常情况下准确预测车辆轨迹,而且能有效提高道路车流量变化情况下的轨迹预测准确率,适用于现实路况环境。
Considering the large change of trajectory prediction error caused by the change of road traffic flow at different time,a Gauss Mixture Time Series Model (GMTSM) based on probability distribution model was proposed.The model regression of mass vehicle historical trajectories and the analysis of road traffic flow were carried out to realize vehicle trajectory prediction.Firstly,aiming at the problem that the uniform grid partition method was easy to cause the splitting of related trajectory points,an iterative grid partition method was proposed to realize the quantity balance of trajectory points.Secondly,Gaussian Mixture Model (GMM) and AutoRegressive Integrated Moving Average model (ARIMA) in time series analysis were trained and combined together.Thirdly,in order to avoid the interference of the instability of GMTSM hybrid model's sub-models on the prediction results,the weights of sub-models were dynamically calculated by analyzing the prediction errors of the sub-models.Finally,based on the dynamic weight,the sub-models were combined together to realize trajectory prediction.Experimental results show that the average prediction accuracy of GMTSM is 92.3% in the case of sudden change of road traffic flow.Compared with Gauss mixed model and Markov model under the same parameters,GMTSM has prediction accuracy increased by about 55%.GMTSM can not only accurately predict vehicle trajectory under normal circumstances,but also effectively improve the accuracy of trajectory prediction under road traffic flow changes,which is applicable to the real road environment.
作者
高建
毛莺池
李志涛
GAO Jian;MAO Yingchi;LI Zhitao(College of Computer and Information,Hohai University,Nanjing Jiangsu 211100,China)
出处
《计算机应用》
CSCD
北大核心
2019年第8期2261-2270,共10页
journal of Computer Applications
基金
“十三五”国家重点研发计划项目(2018YFC0407105)
华能集团重点研发项目(HNKJ17-21)~~
关键词
智能交通
迭代网格划分
轨迹预测
模型可靠性
轨迹相似性
intelligent transportation
iterative grid partition
trajectory prediction
model reliability
trajectory similarity
