卫星寻呼转码卡的研究与设计
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摘要
为解决无线电波污染和覆盖之间的矛盾，各寻呼台服务商纷纷采
用卫星链路方式。但由于各设备接口协议不同，故需要通过网关（转
码卡）实现连接。本课题就是为解决这一问题而提出的。
本文首先简单的介绍无线寻呼系统及其原理，其次对不同方案进
行了论证，最后比较详细的介绍了转码卡的设计、调试和测试。
转码卡设计分为软件和硬件两部分。采用8XC196单片机，外围
芯片，如光电隔离4N35、电平转换ICL232、4位二进制可置数计数
器74LS161、单稳态触发器74LS123、八位移位寄存器74LS595等，
作为POCSAG码字的接收、格式转换和发送的硬件支持。其关键技
术采用自同步方式，即从输入数据中提取时钟。软件采用8XC196的
汇编语言，用高效率的中断方式完成码字的比较、匹配。该转码卡只
用一路就能识别出不同极性、不同波特率的输入数据。
调试和测试的结果表明，本文所介绍的方案是可行的。本转码卡
位同步和纠正时钟误差上明显强于前一版本转码卡。但是由于时间等
原因，软件未能包括对POCSAG码字进行BCH校验的功能。
The service agent of each pager station adopts the satellite channel to solve the conflicting of pollution and covering of radio wave. However due to the difference of the interface devices, the gate which called transform card is need .So the task emerges as the times require.
Radio Paging System and it principle are introduced simple in the paper. Then three schemes are demonstrated. Finally the design~ debug and test of transform card are present in detail.
The design of transform card is divided into two part, software and hardware. The hardware of transform card is constituted by microchip 8XC 196 and peripheral chip such as 4N35 which is photo-electricity segregating~ 1CL232 which is transforming the levels chip 74LS 161 which is binary system counter~ 74LS 123 which is single stable trigger~ 74LS 595 which is shift register and so on, Which key technology is selfsynchronizing, namely clock is abstracted from input data. The assembly language of 8XC196 which have the high efficiency interruption is used to compare and match with POCSAG codes. This transform card can recognize the POCSAG code of different polarity and different rate.
Debug and test indicate the scheme in the paper is feasible. The transform card is stronger than the old transform card on bit synchronizing and error correcting of the clock. However the BCH calibrating of the POCSAG code has not been included in the software due to the urgent times.
用卫星链路方式。但由于各设备接口协议不同，故需要通过网关（转
码卡）实现连接。本课题就是为解决这一问题而提出的。
本文首先简单的介绍无线寻呼系统及其原理，其次对不同方案进
行了论证，最后比较详细的介绍了转码卡的设计、调试和测试。
转码卡设计分为软件和硬件两部分。采用8XC196单片机，外围
芯片，如光电隔离4N35、电平转换ICL232、4位二进制可置数计数
器74LS161、单稳态触发器74LS123、八位移位寄存器74LS595等，
作为POCSAG码字的接收、格式转换和发送的硬件支持。其关键技
术采用自同步方式，即从输入数据中提取时钟。软件采用8XC196的
汇编语言，用高效率的中断方式完成码字的比较、匹配。该转码卡只
用一路就能识别出不同极性、不同波特率的输入数据。
调试和测试的结果表明，本文所介绍的方案是可行的。本转码卡
位同步和纠正时钟误差上明显强于前一版本转码卡。但是由于时间等
原因，软件未能包括对POCSAG码字进行BCH校验的功能。
The service agent of each pager station adopts the satellite channel to solve the conflicting of pollution and covering of radio wave. However due to the difference of the interface devices, the gate which called transform card is need .So the task emerges as the times require.
Radio Paging System and it principle are introduced simple in the paper. Then three schemes are demonstrated. Finally the design~ debug and test of transform card are present in detail.
The design of transform card is divided into two part, software and hardware. The hardware of transform card is constituted by microchip 8XC 196 and peripheral chip such as 4N35 which is photo-electricity segregating~ 1CL232 which is transforming the levels chip 74LS 161 which is binary system counter~ 74LS 123 which is single stable trigger~ 74LS 595 which is shift register and so on, Which key technology is selfsynchronizing, namely clock is abstracted from input data. The assembly language of 8XC196 which have the high efficiency interruption is used to compare and match with POCSAG codes. This transform card can recognize the POCSAG code of different polarity and different rate.
Debug and test indicate the scheme in the paper is feasible. The transform card is stronger than the old transform card on bit synchronizing and error correcting of the clock. However the BCH calibrating of the POCSAG code has not been included in the software due to the urgent times.
引文
1、彭定远 “无线寻呼系统——原理、使用和维修”1995 电子工业出版社
2、罗伟雄 韩力 丁志杰“锁相技术及其应用”1990 北京理工大学出版社
3、王福昌 鲁昆生“锁相技术”1996 华中理工出版社
4、郑继禹“锁相同步理论”1991 重庆大学出版社
5、陆冰霞 李小白“无线寻呼系统”1997 电子工业出版社
6、张厥盛 郑继禹 万心平 “锁相技术”1998 西安电子科技大学出版社
7、唐庆玉“8098 单片机及扩展接口实验指导”1998 清化大学出版社
8、赵秀菊 刘江珩“单片微机 8XC196 原理及应用”1994 东南大学出版社
9、伍湘彬 “无线寻呼机原理与维修技术”1997电子工业出版社
10、童本敏 标准集成电路数据手册 “TTL集成电路”1989 电子工业出版社
2、罗伟雄 韩力 丁志杰“锁相技术及其应用”1990 北京理工大学出版社
3、王福昌 鲁昆生“锁相技术”1996 华中理工出版社
4、郑继禹“锁相同步理论”1991 重庆大学出版社
5、陆冰霞 李小白“无线寻呼系统”1997 电子工业出版社
6、张厥盛 郑继禹 万心平 “锁相技术”1998 西安电子科技大学出版社
7、唐庆玉“8098 单片机及扩展接口实验指导”1998 清化大学出版社
8、赵秀菊 刘江珩“单片微机 8XC196 原理及应用”1994 东南大学出版社
9、伍湘彬 “无线寻呼机原理与维修技术”1997电子工业出版社
10、童本敏 标准集成电路数据手册 “TTL集成电路”1989 电子工业出版社