驾驶人注视点分布对预瞄时间求解精度的影响分析

预瞄是驾驶人模型中的重要环节，预瞄时间的准确性决定了驾驶人模型乃至整个模型的稳定性与精确性.为探究驾驶人注视点分布集中程度对预瞄时间求解精确度的影响.利用眼动仪采集驾驶人眼动数据，对驾驶人眼动数据进行处理得到注视点.利用注视点百分比表征驾驶人注视点分布集中程度，利用预瞄时间置信区间长度表征预瞄时间准确度.探究不同路段上的驾驶人注视点集中程度与预瞄时间求解精度之间的关系.研究表明：不同路段上，当注视矩阵中的元素大于一定值时，预瞄时间的置信区间长度在一定范围之内波动，同时在行驶过程中，驾驶人注视点集中程度越高，注视区域越固定，预瞄时间的求解精度越高.

Influence of the Driver's Fixation Point Distribution on the Accuracy of Preview Time's Solution

Preview is an important part of the driver model. The accuracy of preview time determines the stability and accuracy of the driver model and the whole model. In order to explore the influence of the concentration degree of the driver''s fixation on the accuracy of the preview time, eye tracker was used to collect driver''s eye movement data. The fixation point percent was used to express the distribution concentration degree of the driver fixation and the preview time interval length was used to describe the preview time accuracy. The relationship between the degree of concentration of drivers in different sections of the road and the accuracy of preview time was explored. The results show that when the elements of the fixation matrix are greater than a certain value in different section roads, the confidence interval of the preview time fluctuates in a certain range. In the course of driving, the higher concentration of driver''s fixation is, the more fixed fixation area and the higher the accuracy of the preview time will be.