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该文利用LTCC技术设计微型多层带通滤波器.为了在带外获得陡峭的衰减,通过并联反馈电容,引入了传输零点.然后利用毕奥-萨法尔定律来计算带通滤波器相应的多层结构的各微带线尺寸.结合HFSS电磁仿真,利用MIM电容尺寸与值的关系来优化滤波器的尺寸.最后设计了一个中心频率为2.45GHz,插入损耗小于2dB,阻带衰减大于30dB,尺寸为2.0mm×1.2mm×0.9mm的带通滤波器. 相似文献
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In view of the gradient effect caused by the gradient effect of the Total Variation (TV) algorithm and the environmental noise in the single pixel imaging system, an image reconstruction based on the Gaussian Smooth compressed sensing Fractional Order Total Variation algorithm (FOTVGS) is proposed. Fractional differential loss of low-frequency components of the image increases the high-frequency components of the image to achieve the purpose of enhancing image details. The Gaussian smoothing filter operator updates the Lagrangian gradient operator to filter out the additive white Gaussian noise caused by the differential operator. Simulation results show that, compared with other four similar algorithms, the algorithm can achieve the maximum Peak Signal-to-Noise Ratio (PSNR) and Structural SIMilarity(SSIM) at the same sampling rate and noise level. When the sampling rate is 0.2, compared with the Fractional Order Total Variation (FOTV) algorithm, the maximum PSNR and SSIM increase by 1.39 dB (0.035) and 3.91 dB (0.098) respectively. It can be proved that this algorithm can improve the reconstruction quality of the image in the absence of noise and noise, especially in the case of noise, the quality of image reconstruction is greatly improved. The proposed algorithm provides a feasible solution for image reconstruction of noise caused by environment in single-pixel imaging and other computing imaging system. 相似文献
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机载合成孔径雷达(SAR)运动目标回波本质上为chirp信号,基于分数阶傅里叶变换(FRFT)的chirp基分解特性及分数阶傅立叶变换与时频分布的关系,给出了一种基于FRFT的针对强度相差较大的多运动目标检测方法。与传统的WVD方法相比,FRFT是一个线性变换,因此对于多个动目标就没有交叉项的干扰,简化了处理过程降低了处理复杂度。仿真结果验证了其有效性。 相似文献
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文章介绍了基于DSP的柑橘分级系统的硬件方案所使用的技术.成像系统将采集的图像信息通过视频编码、解码后输入DSP进行预处理,并提取特征值,与标称值进行比较,从而确定每个柑橘的质量级别,实现分级. 相似文献
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单孤子在深聚焦系统中焦平面上的强度分布 总被引:1,自引:1,他引:0
研究了单孤子在深聚焦系统中焦平面上的强度分布。该孤子是微分非线性薛定谔方程(DNLSE)非零边界条件的解。分析了不同孤子参数和深聚焦系统不同数值孔径的条件下亮、暗孤子的聚焦特性。仿真结果表明,暗孤子的聚焦特性随孤子参数具有周期性,亮孤子比暗孤子具有更好的聚焦性,单孤子的聚焦点随孤子参数会发生位移,这种聚焦后的位移特性为光路控制提供了可能。 相似文献