CINRAD/SA(B)发射机触发器芯片级故障诊断流程

Standardized Chip-Level Diagnosis Procedures of Trigger Amplifier for CINRAD/SA(B) Transmitter

发射机触发放大器主要为调制器中SCR开关管提供放电触发脉冲,同时兼具调制组件的保护功能。发射机触发器芯片级故障诊断流程将触发器故障定位到芯片级,大大降低了触发器故障维修成本,同时为雷达测试平台中触发器故障自动诊断建模提供了技术支持。在发射机触发器信号流程基础上,依据发射机触发器关键点波形或关键点电平,通过触发器故障树图了解故障因果关系,研究出规范化的触发器芯片级故障诊断流程。列举了依据触发器芯片级故障诊断流程,修复了由于单稳态触发器无触发信号输出,导致无-200V放电触发信号的单稳态触发器故障个例。结果表明:芯片级触发器故障诊断流程可以快速定位发射机触发器故障点到最小可更换芯片。具有操作方法简洁、诊断思路清晰、操作规范,基层雷达站技术人员容易掌握的特点,可有效提高新一代天气雷达技术保障水平,保证雷达观测数据的可靠性。

The trigger amplifier of a radar transmitter provides a discharge trigger for Silicon Controlled Rectifiers（SCRs）and protects itself from being damaged.The diagnosis procedures of the trigger amplifier is described,which locates faults to the chip level of the unit and lowers the expenses of hardware maintenance,and provides the technical support in the auto-diagnostic model on the radar test platform.The standardized diagnosis procedures of the trigger amplifier are based on the trigger signal flow,the measurements of pulse waves and voltages of the key points,as well as the causal relationship of the fault tree diagram.An example is given,in which minus 200 voltages did not appear because of the lack of trigger output.The results show that the procedures are useful for finding the fault chips in the trigger amplifier,easy to learn for the radar technique personnel,and effective for improving the availability ratio of the radar system.