| 中心导航系统终端地图预取和更新策略研究 |
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| 引用本文： | 石向亭,秦俊,陈思国,牟贺铭,余雪岗,曲良东.中心导航系统终端地图预取和更新策略研究[J].计算机工程与设计,2012,33(4):1362-1367. |
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| 作者姓名： | 石向亭 秦俊 陈思国 牟贺铭 余雪岗 曲良东 |
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| 作者单位： | 吉林大学计算机科学与技术学院符号计算与知识工程教育部重点实验室,吉林长春,130012 |
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| 基金项目： | 国家发改委下一代互联网业务试商用及设备产业化专项基金项目(CNGI-09-01-11);吉林省信息产业发展专项基金项目(20091024);吉林大学基本科研业务费基金项目(200903194) |
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| 摘 要： | 为解决中心导航系统终端通过网络下载电子地图时,网络延时问题对终端地图实时显示的影响,根据空间相关性原理,提出了一种电子地图数据的预取和更新策略.该策略采用对电子地图分块传输和分块存储方法,对地图数据进行预取,并且使用二级缓存的方法,提高地图显示效率.仿真实验和实际车载实验结果表明,在CDMA的数据链路性能条件下,该预取和更新策略可以保证中心导航系统车载终端地图显示的实时性.
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| 关 键 词： | 车载信息系统 中心导航 嵌入式Linux系统 矢量地图 地图预取 CDMA网络 |
Research of central navigation system terminal's E-map data pre-fetch and updating strategy |
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| SHI Xiang-ting
,
QIN Jun
,
CHEN Si-guo
,
MOU He-ming
,
YU Xue-gang
,
QU Liang-dong.Research of central navigation system terminal's E-map data pre-fetch and updating strategy[J].Computer Engineering and Design,2012,33(4):1362-1367. |
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| Authors: | SHI Xiang-ting QIN Jun CHEN Si-guo MOU He-ming YU Xue-gang QU Liang-dong |
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| Affiliation: | (Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education, College of Computer Science and Technology,Jilin University,Changchun 130012,China) |
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| Abstract: | To meet the real-time demand of the e-map updating and display on the central navigation system terminal,an online e-map data pre-fetch and updating strategy is put forward based on spatial correlation.This strategy transmits and stores map data in blocks,at the same time displays map data by secondary cache.Tests based on simulation and test-bed both show that the pre-fetch and updating strategy can achieve good performance of online e-map distribution by using CDMA on the central navigation system terminal. |
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| Keywords: | vehicle information system central navigation embedded Linux system vector map map data pre-fetch CDMA network |
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