基于GIS和GPS的交通状态参数估计与仿真模型  

Travel Time Estimation and Simulation Model Based on Taxi-Based GPS and GIS

作　　者：童小华[1] 陈建阳[2] 

机构地区：[1]同济大学测量与国土信息工程系 [2]同济大学交通工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2005年第12期1604-1607,共4页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金资助项目(40301043;40171078);上海市青年科技启明星计划资助项目(05QMX1456);测绘遥感信息工程国家重点实验室开放研究基金项目(WKL(03)0301)

摘　　要：基于'大样本,长周期'条件(大样本指车辆数5 000～50 000,长周期指GPS位置传送间隔2～5 min),探讨了在GIS环境下用仿真出租车GPS信息来估计和推算行程时间参数,包括建立参数估计模型、基于GIS的仿真、采用Householder变换解算大规模矩阵;最后将通过仿真系统模拟获得的解算结果数据,与最初给每条路段预设的等级而确定的每条路段上行驶的时间相比较,实验表明达到预期效果,验证了模型和方法的有效性.A new travel time estimation method using taxi based GPS and GIS is studied in this paper. Based on enough taxi based GPS observations and long GPS observation for transfer interval, a least squares based model is first proposed to obtain for the travel time parameters. A simulation system based on GIS is then developed. The steps to estimation for the travel time are therefore presented, including the transformation of GPS coordinates, simulation of taxi driving tracks, route determination, route rounding and estimation of the travel times in all the road segments. A Householder transformation is further used to calculate massive and ill-conditioned equations to obtain the real time estimation parameters. Case studies are discussed through the implementation of the simulation system, and the result proves the feasibility of the proposed models and methods.

关 键 词：行程时间估计 最小二乘 Householder变换 全球卫星定位系统 地理信息系统 

分 类 号：U491[交通运输工程—交通运输规划与管理]