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We introduce a velocity-difference-separation model that modifies the previous
models in the literature. The improvement of this new model over the previous ones
lies in that it not only theoretically retains many strong points of the previous
ones, but also performs more realistically than others in the dynamical evolution of
congestion. Furthermore, the proposed model is investigated with analytic and
numerical methods, with the finding that it can demonstrate some complex physical
features observed in real traffic such as the existence of three phases: free flow,
synchronized flow, and wide moving jam; sudden flow drop in flow-density plane; and
traffic hysteresis in transition between the free and the synchronized flow. 相似文献
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基于GPS/DR的车载导航设备的改进及算法 总被引:3,自引:0,他引:3
将 GPS 定位航位推算(DR)技术结合起来,可以用于车辆的定位和导航中。但是现有的航位推算设备都需要用角度传感器测量车辆的行驶方向,在实际应用中存在很多不便而且性价比不高。为解决这一问题,通过研究设计了只使用速度传感器就可以进行航位推算的设备,并对设备的工作原理、体系结构和基本算法进行了介绍。通过对模拟实验数据进行分析,证明了这种航位推算方法可以很好地弥补 GPS 导航定位的不足。 相似文献
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