CINRAD/SA(B)发射机激励放大器芯片级故障诊断流程

Chip-Level Fault Diagnosis Process for Driver Amplifier of CINRAD/SA(B) Transmitter

激励放大器是发射机射频放大链电路前级功率放大器,对雷达探测资料可靠性具有重要作用。研究芯片级故障诊断流程,一方面可以解决台站技术保障人员无法故障定位到芯片级的技术难题;另一方面,芯片级故障维修可达到大大降低维修成本的目的。雷达故障一般分为参数调整不当导致性能下降故障和器件损坏造成参数异常故障。为此,通过总结出CINRAD/SA(B)发射机激励放大器信号流程、故障树图集,在依据同步信号时序关系及关键点波形参数基础上,研究出规范化的激励放大器调试技术和方法,以及激励放大器芯片级故障诊断定位流程,并列举了依据激励放大器芯片级故障诊断定位流程,修复激励放大器集成块N8损坏,导致+8 V电源不正常,造成激励放大器无功率输出,以及激励放大器的第二级功放模块故障导致激励放大器输出功率低的两个故障的典型个例,以检验维修效果。实际应用结果表明:芯片级激励放大器故障诊断定位流程可以快速定位发射机激励放大器故障点到故障器件,方法简洁、思路清晰、操作规范,基层雷达站技术人员容易掌握;激励放大器调试技术和方法,能解决激励放大器参数调整不当导致激励放大器性能下降故障,可有效提高新一代天气雷达技术保障水平。

Drive amplifier is the power enlargement device in the front RF amplification chain of the transmitter,which is very important to the radar data reliability. Study the fault diagnosis process on chiplevel,on one hand,can solve the technical problem of fault location to the chip level for the technical support person,on the other hand,can significantly reduce the maintenance cost. Radar fault generally divided into improper parameter adjustment faults and device damage faults. According to the CINRAD/SA( B) transmitter driver amplifier signal process and fault tree atlas,based on synchronizing signal sequential relationship and key wave parameter,the normalized debugging techniques and methods and fault diagnosis location process on chip-level of drive amplifier adjusting solution are developed. Two successful fault diagnosis cases are illustrated to test the maintenance effect based on fault diagnosis location process: no power output from the drive amplifier caused by module N8 damage and abnormal + 8 V power and low power delivery caused by the second-level power amplifier module fault. The illustration showed that it could quickly locate the failure point at chip level in the transmitter driver amplifier based on the new fault diagnosis location process,the simple method,clear thinking and standard operation is easy for grassroots level technicians to master. The driver amplifier debugging techniques and methods can solve the radar fault caused by improper driver amplifier parameters adjustment,and effectively improve the technical support level of the new generation weather radar.