软件雷达构想

参考软件无线电的概念提出了软件雷达的构想。根据雷达技术从“模拟雷达”向“数字雷达”到“软件雷达”的发展,详细讨论了“软件雷达”的主要构成、需要解决的技术难点问题,最后提出了该构想的发展前景。     

基于UVM验证方法学的存储转发系统验证

针对存储转发系统数据随机性、不同接口之间时序异步的特点,提出了不同于典型平台的事物级数据结构和参考模型设计,构建基于System Verilog语言的通用验证方法学(UVM)的验证平台。验证结果表明,此验证平台能够灵活控制随机约束和验证进程,优化验证事务。该平台提高了验证的效率和验证平台的可重用性,较好地满足了超大规模可编程逻辑器件验证需要。     

新媒体发展趋势探析

当前,在信息网络的影响下,新媒体的精神内涵发生了重大的变化,信息载体形式不再单纯依靠广播和电视。随着计算机技术的快速发展,我国新媒体呈现出多元化发展趋势,自媒体、流媒体的出现,极大地丰富了人们的业余生活。人们在享受便捷化信息服务的同时,也感受到了信息传播模式的变化,传统媒体的市场份额在不断地降低,新媒体的市场份额在不断扩大。特色化的新媒体进入到了人们的视野之中,既促进了新的经济增长热点的出现,同时也促进了我国经济的发展。     

Wavefront reconstruction algorithm for wavefront sensing based on binary aberration modes

We propose a new algorithm for wavefront sensing based on binary intensity modulation. The algorithm is based on the fact that a wavefront can be expended with a series of orthogonal and binary functions, the Walsh series. We use a spatial light modulator(SLM) to produce different binary-intensity-modulation patterns which are the simple linear transformation of the Walsh series. The optical fields under different binary-intensity-modulation patterns are detected with a photodiode.The relationships between the incident wavefront modulated with the patterns and their optical fields are built to determinate the coefficients of the Walsh series. More detailed and strict relationship equations are established with the algorithm by adding new modulation patterns according to the properties of the Walsh functions. An exact value can be acquired by solving the equations. Finally, with the help of phase unwrapping and smoothing, the wavefront can be reconstructed. The advantage of the algorithm is providing an analytical solution for the coefficients of the Walsh series to reconstruct the wavefront. The simulation experiments are presented and the effectiveness of the algorithm is demonstrated.     

超短波联合超视距通信技术研究

兼蓄并用流星余迹、对流层散射和Es层信道资源的超短波联合超视距通信系统,是流星余迹通信设备的波形扩展和能力提升设备.基于上述信道模式可在同一链路实现弯管传输的物理机制,论述了超短波联合超视距通信的可行性;进而给出了一种通信系统解决方案,对其功能特点、系统组成、工作流程及关键技术进行了简要介绍;并通过距离为1 495 km和293 km的2条链路的野外试验,评估了多模共链的超视距通信效果,表明在超远距离及近距离上皆实现了与单一流星余迹模式相比的通信能力提升.     

An Economical Scheme for Cloning an Unknown M-Qudit Equatorial-Like State with Assistance

We propose a scheme to realize quantum cloning of an unknown M-qudit equatorial-like entangled state. The first stage of the protocol requires teleportation. After the teleportation is accomplished, the receiver can reestablish the original state. In the second stage of the protocol, with the assistance （through a single-particle projective measurement） of the preparer, the perfect copy of an original state can be produced at the site of the sender. Our scheme requires a single maximally entangled qudit pair as the quantum channel and three dits classical communication. The scheme is feasible at the expense of consuming local resources which include M - 1 ancillary qudits introduced by the receiver and additional bi-qudit operations. Moreover, we construct a sort of unitary transformations which ensure ancillary qudits are not necessarily introduced by the sender. Comparing to the previous protocols, the proposed protocol is economical due to that the cost of both quantum nonlocal resources and classical communication is lowest.     

日常节目制作中Maya的应用

Maya是电视节目包装中最常使用的软件,功能强大,简单易用.本文介绍了如何用较短的时间使用三维软件基本功能,实现导演要求的日常剪辑软件无法完成的特殊节目包装效果.     

网络化超高清制作岛的设计与实施

随着4K技术的全面应用,中央广播电视总台4K超高清频道开播,对于4K后期制作需求快速增加,网络化的超高清制作岛必然成为发展趋势,4K后期制作全面融入全台文件化制播流程体系中。本文以超高清制作岛3为例从系统架构、素材管理、后期制作及调色流程、4K制作岛特点等,多角度、全方位介绍网络化超高清制作岛的优势。     

日常节目制作中跟踪与稳定的应用

在节目制作中我们经常会遇到画面由于拍摄条件有限或摄像失误造成的画面抖动,而在后期的编辑中又没有可替代的镜头,这时我们通常会用到稳定功能,消除镜头的晃动,使画面保持稳定.而跟踪功能主要适用于特效的处理,跟随画面中的某个物体,附加或处理成特殊效果,跟踪和稳定是我们在影视后期经常要用到的特技,不同之处在于一个作用于画面本身,一个用于附加其它对象,但都会利用于跟踪所得到的运动轨迹.