城轨列车辅助逆变器大功率器件开路故障诊断

随着LTE技术的不断发展，军事通信领域的通信终端产品也需要更新、升级。通信终端模块（CTM，Communication Transmission Module）是一款嵌入式的TD-LTE数据卡终端产品。AT指令模块用来实现CTM与PC机之间的数据传输与控制。提出了CTM中AT指令模块的软件设计方案，采用模块化的设计方法，统一上层应用接口，实现了应用程序与Nucleus平台的衔接，提高了应用程序的可移植性；AT指令的函数匹配处理流程采用分类查找法，简化了AT指令的查找过程，提高了查找效率。最后搭建测试环境，验证了AT指令模块的功能，以上方法在实际开发和应用中都具有良好的扩展性、通用性和可移植性。

IGBT open circuit Fault Diagnosis of Subway Auxiliary Inverter

The wide application of LTE have led to the rapid development of LTE terminal products. CTM (Communication Transmission Module) is an embedded LTE data card terminal product.AT command is the message exchanging uniform mechanism of PC and data card.This paper analyses software architecture of CTM, proposes the software design scheme of AT command module in CTM,the data transmission has been controlled and managed between the PC and the CTM through the AT command.This method realized the cohesion between application and the platform,Improving the application versatility and portability.Finally, the function of AT command module verified with the help of a test platform.