The uniform mathematical model of distortion signals in power grid has been setup with the theory of Wiener-G Functional. Firstly,the Matlab simulation models were established. Secondly,the Wiener kernel of power load...The uniform mathematical model of distortion signals in power grid has been setup with the theory of Wiener-G Functional. Firstly,the Matlab simulation models were established. Secondly,the Wiener kernel of power load was found based on the Gaussian white noise as input. And then the uniform mathematical model of the power grid signal was established according to the homogeneous of the same order of Wiener functional series. Finally,taking three typical distortion sources which are semiconductor rectifier,electric locomotive and electric arc furnace in power grid as examples,we have validated the model through the Matlab simulation and analyzed the simulation errors. The results show that the uniform mathematical model of distortion signals in power grid can approximation the actual model by growing the items of the series under the condition of the enough storage space and computing speed.展开更多
在传统成像系统设计中,光学透镜往往以传递函数和视场FOV(field of view)等为目标进行人工优化及调制,这通常会导致复杂的镜头堆积。为了简化成像系统,本文基于光学成像原理,运用改进的遗传算法,提出一种端对端协同设计方法,设计一种具...在传统成像系统设计中,光学透镜往往以传递函数和视场FOV(field of view)等为目标进行人工优化及调制,这通常会导致复杂的镜头堆积。为了简化成像系统,本文基于光学成像原理,运用改进的遗传算法,提出一种端对端协同设计方法,设计一种具有高质量40°大视场的单透镜成像系统。该方法对不同视场下的单透镜成像模糊核PSF(point spread function)进行数值优化,不仅有效抑制了焦斑旁瓣能量和背景杂散光,还使各视场的PSF趋于一致,改变了因不同视场PSF空间变化导致的图像复原不均匀问题。同时,该方法能够很好地校正大视场角引发的像散、场曲等初级像差。最后,使用优化后的单透镜系统对灰度图像进行实时成像,并通过维纳逆卷积复原。大量对比测试显示,相较于传统的非球面单透镜,本文方法所构建的单透镜系统在40°的视场角下,峰值信噪比(peak signal to noise ratio, PSNR)和结构相似性指数(structural similarity index measure, SSIM)分别提高11%和15%,对于成像质量的提升程度也稳定在(11±3)%左右。该方法可应用于无人机监控、公安侦察、智能监控等可见光/红外民用光电成像设备的镜头设计。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.51277043)
文摘The uniform mathematical model of distortion signals in power grid has been setup with the theory of Wiener-G Functional. Firstly,the Matlab simulation models were established. Secondly,the Wiener kernel of power load was found based on the Gaussian white noise as input. And then the uniform mathematical model of the power grid signal was established according to the homogeneous of the same order of Wiener functional series. Finally,taking three typical distortion sources which are semiconductor rectifier,electric locomotive and electric arc furnace in power grid as examples,we have validated the model through the Matlab simulation and analyzed the simulation errors. The results show that the uniform mathematical model of distortion signals in power grid can approximation the actual model by growing the items of the series under the condition of the enough storage space and computing speed.
文摘在传统成像系统设计中,光学透镜往往以传递函数和视场FOV(field of view)等为目标进行人工优化及调制,这通常会导致复杂的镜头堆积。为了简化成像系统,本文基于光学成像原理,运用改进的遗传算法,提出一种端对端协同设计方法,设计一种具有高质量40°大视场的单透镜成像系统。该方法对不同视场下的单透镜成像模糊核PSF(point spread function)进行数值优化,不仅有效抑制了焦斑旁瓣能量和背景杂散光,还使各视场的PSF趋于一致,改变了因不同视场PSF空间变化导致的图像复原不均匀问题。同时,该方法能够很好地校正大视场角引发的像散、场曲等初级像差。最后,使用优化后的单透镜系统对灰度图像进行实时成像,并通过维纳逆卷积复原。大量对比测试显示,相较于传统的非球面单透镜,本文方法所构建的单透镜系统在40°的视场角下,峰值信噪比(peak signal to noise ratio, PSNR)和结构相似性指数(structural similarity index measure, SSIM)分别提高11%和15%,对于成像质量的提升程度也稳定在(11±3)%左右。该方法可应用于无人机监控、公安侦察、智能监控等可见光/红外民用光电成像设备的镜头设计。
