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介绍了基于多分辨率信号分解(MSD)小波变换算法的抗干扰微弱信号提取方案。通过对模拟噪声模型的弱信号和实测的导弹红外导引头的弱信号的提取可以看出,MSD小波变换算法速度快、实时性好,能有效地抑制噪声,适应战时需要。 相似文献
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因电涌保护器(SPD)故障导致通信机房设备燃烧事故时有发生。本文根据IEC61643-11-2011"模拟SPD失效模式的补充试验"要求,对几种SPD后备保护装置进行对比实验,认为SPDDP具有过电流迅速切断的功能,可用于SPD电路过电流后备保护。 相似文献
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The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x (3 ≤ x ≤ 10, at.%) alloys are studied using the microscopic phase-field dynamic model. The microelaso ticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size (ADS) of L12 and D022 deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates. 相似文献
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设计了一个共源-共源共栅的两级低噪声放大器,并且在两级之间采用了串联谐振回路来提高电路的性能.该电路采用TSMC 0.18μm CMOS工艺,电源电压为1.8 V.仿真结果显示,在2.45 GHz的中心频率上,该电路能够提供26.92 dB的正向增益及很好的输入输出匹配,噪声系数为0.88 dB,功耗为14.49 mW,1dB压缩点为-9dBm. 相似文献