Data Link Design for Automatic Vehicle Location Systemwith High Capacity and Precision
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摘要: 目前自动车辆定位系统存在容量少,报警碰撞和精度低等缺陷.因此,对自动车辆定位系统和时隙ALOHA(SALOHA)的特点进行了分析研究,提出了广播预约ALOHA(BRALOHA)这一新的数据链路设计方法,即基站广播差分信息,子站预约传输位置等信息和平滑接收机噪声等.其集中控制策略,吞吐量负载性能以及时延吞吐量性能表明,它适宜于设计大容量高精度自动车辆定位系统.Abstract: The present automatic vehicle location system (AVLS) has some defaults such as smaller capacity,alarm collision and lower precision etc.Based on the characteristic analysis of AVLS and slot ALOHA (SALOHA),a new method of data link design,which is called Broadcast Reserved ALOHA (BRALOHA),is proposed in this paper,consequently the base station broadcasts differential GPS(DGPS) information,and mobile users transmit their location information reservely,and smooth GPS receiver's noise.It has been shown that BRALOHA is satisfied with the design for AVLS with high capacity and precision by its centralized communication scheme,the throughput versus offered load and throughput versus delay performance .
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Key words:
- locate systems /
- mobile communication /
- data transmit /
- GPS /
- DGPS /
- AVLS
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