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信电系关于举办第十六期“I•SEE”学术论坛报告的通知

编辑:xsgz 日期:2011-03-09 访问次数:10

兹定于2011310日(周四)晚上630,在玉泉校区教三-441举行“I•SEE”学术论坛第十六场学术报告交流会。本次学术论坛邀请到李云飞、程岳、殷锐三位同学:

 

一、个人简介

李云飞,信息与通信工程研究所08级硕士。导师为赵民建教授,研究方向为卫星导航接收技术。

报告内容:

卫星导航是目前学术界研究的热点,依靠完善的GPS系统,导航定位无论在军用方面还是民用领域均已经不可或缺。目前卫星导航主要应用于三个方面:

高动态卫星导航接收技术(主要是军用领域)

高精度卫星导航接收技术(主要用于测绘领域,如地质勘探)

高灵敏度卫星导航接收技术(主要是民用导航,如室内定位)

其中高灵敏度卫星导航具有如下特点

相比室外空旷地带,接收信号功率衰减达10~30dB,通常低于-150dBm,甚至会低于-160dBm

卫星与接收机之间无法做到相对静止,相对的运动会产生载波多普勒

高灵敏度载波跟踪:受到BPSK解调误码率在弱信号条件下过高的影响,高灵敏度环境下无需实现相位跟踪,只需要保持载波频率稳定跟踪。

导航卫星信号接收模型

基于动态补偿FFT的载波频率估计

 

二、个人简介

程岳,浙大物理电子学专业博士生,导师沈会良,科研方向为计算机视觉。

报告内容:

题目:Surface Reconstruction from Gradient Fields Using Box-spline Kernel 《利用箱样条核函数 从梯度重建物体表面信息》

Kernel approaches become increasingly popular in the image processing and computer vision fields. Reconstruction from gradient field using kernel method is limited for it's boundary condition and sensitive to the choice of the kernel function. By converting every order of the surface to kernel representation, the underlying surface can be recovered by least square method. With considering a even extension of the original gradient field, Gram matrix become balanced and the recovered surface will not oscillate at the boundary. Especially for Poisson equation, the special processing of boundary assumes a Newman boundary condition instead of Dietrich boundary, which is more useful in practical situation. In the kernel reconstruction method, the common choice of kernelfunction is Gaussian function, which is infinite supported, and always difficult to determine cut-off radius R and variance sigma. With our proposed Boxs-pline kernel function, the compact regular octagon support nature make it more accurate and convenient to use. It just need to set the cut-off radius without bothering sigma parameter. Experimental results show that, compared with pervious method our proposed Box-spline kernel based approach outperforms the state-of-the-art technique in preserving sharp edges and fine details, without prior knowledge of depth discontinuity.

 

三、个人简介

殷锐,浙江大学信息与通信工程研究所07届博士生,导师张朝阳,研究方向为无线通信理论。

报告内容:

中继站和频分多址接入技术已经成为第四代移动通信中最为热门的两种技术。具体分析和传统的单跳系统相比,在基于OFDM调制方式下的中继系统设计资源优化算法有哪些不同等。报告将主要涉及到在无线中继系统中,如何根据上述特点进行相应的资源分配算法设计

欢迎广大师生参加!

 

信电系研究生党总支

201139