学科建设
EE论坛:A Unified Estimator for Near-Field and Far-Field Localization Using TDOA
发布于:2017-09-25 10:50:17   |   作者:[学院] 电工学院   |   浏览次数:3439

一、讲座时间:2017年10月11日10:30 AM

讲座地点:C216

讲座题目:A Unified Estimator for Near-Field and Far-Field Localization Using TDOA

主讲人: Dominic K. C. Ho, IEEE Fellow, James C. Dowell Professor, Electrical Engineering and Computer Science Department, University of Missouri, Columbia, MO 65211, USA

 

报告简介:Localization of an object is fundamental in many engineering applications, including wireless communications, sensor networks, microphone array, robotics, and many others.  Using a number of sensors and observing the signal arrival time differences, we are able to determine the unique coordinates of an object if it is not distant.  On the other hand, we can only obtain its Direction of Arrival (DOA) if it is far away.  One has to know if the object is near or far to apply point or DOA estimation and such knowledge is often unavailable in practice. Using a near-field model to locate a distant object will yield an unreasonable result caused by the thresholding effect and applying a far-field model to a near object will produce a significant DOA bias. This talk revisits the Hybrid Bhattacharyya-Barankin (HBB) Bound that illustrates the thresholding phenomenon in locating the point position of an object as its range to the sensor array increases. A unified TDOA positioning estimator based on an iterative implementation of the Maximum Likelihood Estimator (MLE) is next introduced, which does not require the knowledge if the object is near or far.  It automatically generates a point position if the object is near and yields the DOA if it is far. An initialization to the MLE based on a solution by the semidefinite relaxation is proposed. Simulation examples validate the good performance of the proposed estimator.

Keywords: Localization, TDOA, near-field, far-field, thresholding effect, semidefinite relaxation

主讲人简介: Dominic K. C. Ho was born in Hong Kong. He received the B.Sc. degree with First Class Honors in Electronics and the Ph.D. degree in Electronic Engineering, both from the Chinese University of Hong Kong.

He was a research associate in the Royal Military College of Canada, a member of Scientific Staff at the Bell-Northern Research, Montreal, Canada, and a faculty in the Department of Electrical Engineering at the University of Saskatchewan, Saskatoon, Canada.  He is currently a James C. Dowell Professor in the Electrical Engineering and Computer Science Department of the University of Missouri. His research interests are in sensor array processing, source localization, wireless communications and adaptive processing.

Dr. Ho is a Fellow of the IEEE. He was a Technical Chair of the IEEE International Conference on Acoustics, Speech and Signal Processing 2016 (ICASSP2016). Dr. Ho served as the Past Chair (2015), Chair (2013-2014) and Vice-Chair (2011-2012) of the Sensor Array and Multichannel (SAM) Technical Committee of the IEEE Signal Processing Society. He was in the organizing committees of the IEEE SAM 2008 Workshop and the IEEE CAMSAP 2011. He was an Associate Editor of the IEEE Transactions on Signal Processing (2009-2013, 2003-2006) and the IEEE Signal Processing Letters (2004-2008). He received the Senior Faculty Research Award in 2014 and 2009, the Junior Faculty Research Award in 2003 and the Teaching Award in 2006 from the College of Engineering at the University of Missouri. He is an inventor of 22 patents in the United States, Canada, Europe and Asia on geolocation and signal processing for wireless communications.

 

二、座谈会
座谈会时间: 10月11日(星期三)下午2:00~4:00
座谈会地点: 清水河校区宾诺咖啡
议题: 不限,可讨论研究方法、最新学科动向及选题等,欢迎感兴趣的老师和同学参与!