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| 引用本文： | 张存保,杨晓光,严新平.??????????????????????о?[J].交通运输系统工程与信息,2007,7(3):100-104. |
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| 作者姓名： | 张存保 杨晓光 严新平 |
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| 作者单位： | 1 ?人????? ?????????о???????人 430063 ;2 ????? ??????乤????????? 200092 ; |
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| 基金项目： | 国家重点基础研究发展计划(973计划)(2005CB724205) |
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| 摘 要： | 利用安装GPS设备的浮动车采集动态交通信息，具有数据精度高、覆盖范围广、实时性强等优点。阐述了基于浮动车的交通信息采集系统的原理和组成，针对目前浮动车采样周期主要凭主观经验确定的问题，提出了采样周期优化的理论方法：将浮动车瞬时速度当作随机信号，利用傅立叶变换对其进行频域分析，然后依据Shannon采样定理，确定浮动车的优化采样频率。结果表明：本文方法确定的采样周期可以获得较高的数据采集精度，满足实用要求。
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| 关 键 词： | ????????? ?????? ???????? ?????? ???????? |
| 文章编号： | 1009-6744（2007）03-0100-05 |
| 收稿时间： | 2006-11-30 |
| 修稿时间： | 2006-11-30 |
Method for Floating Cars Sampling Cycle Optimization |
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| ZHANG Cun-bao,YANG Xiao-guang,YAN Xin-ping.Method for Floating Cars Sampling Cycle Optimization[J].Transportation Systems Engineering and Information,2007,7(3):100-104. |
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| Authors: | ZHANG Cun-bao YANG Xiao-guang YAN Xin-ping |
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| Institution: | 1.ITS Center, Wuhan University of Technology, Wuhan 430063 ;2.School of Traffic and Transportation, Tongji University, Shanghai 200092 ; |
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| Abstract: | Floating-car system has become a new way to collect real-time traffic data,which has many advantages such as high precision,large coverage area,etc.This paper has described the composing of floating-car system,presented a theoretical method for floating-car sampling cycle optimization: regarding speed as a stochastic signal,analyzed its frequency spectrum using fourier transform,and decided the optimal sampling frequency by Shannon sampling theory.The result shows that the optimal sampling frequency can acquire high data precision,which is suitable for practical application. |
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| Keywords: | traffic data collection floating cars sampling cycle frequency spectrum ITS |
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