针对通信导航识别系统(Communiction,Navigation and Identification,CNI)中L波段多功能射频综合化的需求,对L波段接收机射频前端电路进行综合化设计。通过分析CNI中航管、塔康、精密测距等L波段功能对接收机的性能需求,结合接收机主要...针对通信导航识别系统(Communiction,Navigation and Identification,CNI)中L波段多功能射频综合化的需求,对L波段接收机射频前端电路进行综合化设计。通过分析CNI中航管、塔康、精密测距等L波段功能对接收机的性能需求,结合接收机主要工作原理和技术指标选取二次变频超外差接收机结构作为实现方案,并对接收机射频前端下变频电路和中频电路进行设计,通过复用前级下变频电路,在中频放大电路中分功能处理实现射频前端综合化设计。计算了两种放大模式下各级器件的增益、噪声系数等指标,结论表明各项指标满足功能设计需求,该射频前端综合化设计方案可以满足CNI系统L波段接收机射频综合化需求。展开更多
In order to improve the safety of the battery of satellite side mounting,and prevent the screw from producing excess due to frequent assembly and disassembly,the YS-20 material replacement and structure optimization d...In order to improve the safety of the battery of satellite side mounting,and prevent the screw from producing excess due to frequent assembly and disassembly,the YS-20 material replacement and structure optimization design of the screw body are carried out under the premise of not changing the original tooling.The double⁃shear test of YS-20 bar is carried out,and the ANSYS optimization design module is used to design 7×7×6,a total of 294,calculation cases of D1,D2,T,the three important dimension parameters of screw structure.The actual bearing state of screw composite structure is accurately simulated by using asymmetric contact model.Three comprehensive evaluations are established,and the calculation examples satisfying the conditions are evaluated comprehensively.The final results are T=12.2 mm,D1=16 mm,D2=2 mm.The stress verification and contact analysis are carried out for the final scheme and the bearing state and contact state optimized screw structure are obtained.展开更多
文摘针对通信导航识别系统(Communiction,Navigation and Identification,CNI)中L波段多功能射频综合化的需求,对L波段接收机射频前端电路进行综合化设计。通过分析CNI中航管、塔康、精密测距等L波段功能对接收机的性能需求,结合接收机主要工作原理和技术指标选取二次变频超外差接收机结构作为实现方案,并对接收机射频前端下变频电路和中频电路进行设计,通过复用前级下变频电路,在中频放大电路中分功能处理实现射频前端综合化设计。计算了两种放大模式下各级器件的增益、噪声系数等指标,结论表明各项指标满足功能设计需求,该射频前端综合化设计方案可以满足CNI系统L波段接收机射频综合化需求。
文摘In order to improve the safety of the battery of satellite side mounting,and prevent the screw from producing excess due to frequent assembly and disassembly,the YS-20 material replacement and structure optimization design of the screw body are carried out under the premise of not changing the original tooling.The double⁃shear test of YS-20 bar is carried out,and the ANSYS optimization design module is used to design 7×7×6,a total of 294,calculation cases of D1,D2,T,the three important dimension parameters of screw structure.The actual bearing state of screw composite structure is accurately simulated by using asymmetric contact model.Three comprehensive evaluations are established,and the calculation examples satisfying the conditions are evaluated comprehensively.The final results are T=12.2 mm,D1=16 mm,D2=2 mm.The stress verification and contact analysis are carried out for the final scheme and the bearing state and contact state optimized screw structure are obtained.
