智能公交车载终端抗干扰设计与实验调试

Anti-interference Design and Test-adjusting of Advanced Public Transportation System Vehicle Terminal

针对智能公交车载终端在工作环境中出现的干扰问题,提出硬件抗干扰设计和软件抗干扰设计方法,并采用实验手段进行调试。硬件抗干扰设计包括稳压电路块单独供电,输入输出通道隔离,传输线分开铺设。软件抗干扰措施包括重复检测滤波,短周期重复信号,指令预防程序运行失常。并以功能模块为单位进行单片机系统的调试,各个功能模块调试通过后将硬件和软件程序组合到一起进行联合调试。结果表明,在实地测试环境下,该系统可以正常准确地进行工作。

Against the problem on auti-interferences of advanced public transportation system（APTS） vehicle terminal,the anti-interference designs of both the hardware anti-interference and the software one were proposed,both tested and adjusted.Hardware anti-interference design comprises independent stabilized voltage supply,insulation of input and output channels,separated layout of the transmission line.Software anti-interference measures comprise duplicate detection of digital filter,short circle repetition of signal,and order prevention of program disorders.Single chip microcomputer system adjusting was run by the function module as the unit.Hardware and software will be combined together and adjusted after the various functional modules test-adjusting.The test results on the spot expatiate that the system can work properly and accurately in the test environment.