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�������պ����ѧѧ�� 1998, Vol. 24 Issue (2) :145-148    DOI:
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Data Link Design for Automatic Vehicle Location Systemwith High Capacity and Precision
Wu Shaochun, Li Xianliang, Zhang Qishan*
Beijing University of Aeronautics and Astronautics,Dept. of Electronic Engineering

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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 .
Keywords�� locate systems   mobile communication   data transmit   GPS   DGPS   AVLS     
Received 1996-12-03;
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���ٴ�, ������, ������.�������߾����Զ�������λϵͳ������·���[J]  �������պ����ѧѧ��, 1998,V24(2): 145-148
Wu Shaochun, Li Xianliang, Zhang Qishan.Data Link Design for Automatic Vehicle Location Systemwith High Capacity and Precision[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 1998,V24(2): 145-148
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y1998/V24/I2/145
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