研究性教学推行机制的研究

为了提高研究生的研究和创新能力，避免部分本科生的高分低能现象平移到研究生阶段，弥补现有的研究生选拔机制较难考核应试者的研究能力的缺陷，在研究生培养单位、学科、研究生任课教师等不同层面通过切实可行的推进机制完善研究生的研究性教学，有效提高研究生的培养质量势在必行。本文以信息学科为研究对象、以省级企业研究生工作站为平台、以中日联合培养研究生为契机，探索不同类别师资、不同培养类别、多途径研究性教学的举措，改变传统教学方法培养出来的研究生考试成绩好而发现问题能力差、分析能力强而综合设计能力差的现状，形成具有总结和推广价值的成果，将研究生培养成能够将知识转化为创新能力、将能力提升为良好的综合素质的人才。     

研究生"数字通信"课程教学改革探索

本文介绍了研究生“数字通信”课程教学改革中进行的一些探索与实践,主要包括教学目标创新、教学内容调整、教学方法和评价方式改进等内容,分析了研究生课程教学中的创新能力培养问题。建议加强教材建设、提高教学队伍素质、倡导研究性学习和加大课程设计比重,以提高研究生学习的主体意识和探索精神。目的在于探索数字通信教学的全新模式,突出研究生研究能力和创新能力的培养。     

校企协同研究生创新人才培养模式探索

在国家新基建战略以及双碳目标背景下,契合新工科理念,本文提出电气类硕士研究生创新人才培养三大新要求：立德树人、学科交叉、科研服务产业。文章阐述了通过充分发挥协同育人机制,优化课程体系,强化工程实践,科研服务产业发展, 形成了“521”研究生创新人才培养模式(5个培养阶段; 2类教育贯穿始终;1套管理制度),构建了校企无缝对接研究生实践创新能力培养有效机制,取得了持续有效的人才培养效果。     

深化课程教学改革探索工科研究生工程实践与创新能力的培养

阐述了培养工科研究生工程实践与创新能力的重要意义,介绍了课题研究背景与指导思想。详细讨论了DSP技术应用课程教学内容、教学模式．教学方法的改革方案。经过两年多的实践检验,教学改革效果明显,对于工科研究生工程实践、创新意识和创新能力的培养有着重要启发和推动作用。     

利用协同创新中心改革研究生培养模式

本文在我国社会经济发展和高校体制变革的背景下,结合控制工程全日制专业学位硕士研究生创新能力培养模式的改革实践,从协同体资源互补优势、学科交叉融合的智力资源配置和国际化学术高地等方面,给出了利用协同创新中心的共享资源提升专业学位硕士研究生创新能力的改革思路,为推动专业学位硕士研究生培养体制改革提供理论与实践依据。     

军校工科研究生创新能力培养的探析

本文探讨了军校工科研究生创新能力的要素、军校工科研究生教育转型下研究生创新能力培养的问题及矛盾,采用博弈论方法分析了院校组织内部个体在面临选择时的行为,指出院校组织内部个体间的非合作博弈行为会明显降低研究生创新能力培养的效益,提出了一些有针对性的对策.     

基于科研平台的研究生创新能力培养

科研平台是培养研究生科研水平和创新能力的主要载体。建立具有实用价值的科研平台,对于专业硕士综合素质的提高和创新能力的培养具有重要意义。以燕山大学电子信息类控制工程领域为例,介绍了近几年专业硕士研究生实践能力培养现状,对科研平台在研究生培养中的作用及成效进行分析,并给出了科研平台的运营与管理模式,对研究生创新能力培养具有一定的指导意义。     

产学研模式培养研究生的探索

本文分析了当前研究生培养中存在的问题,探讨企业、研究所和高校通过产学研结合培养研究生的必要性以及产学研结合的具体模式。对新形式下我院在产学研合作培养研究生的模式方面所取得的成果进行了总结,探索了研究生创新能力培养新模式,对推进产学研合作培养高层次应用型人才具有一定的指导意义。     

基于学科竞赛的IT专业大学生创新实践能力培养

学科竞赛活动是培养学生创新能力的重要平台,是课堂教学的重要补充。本文在结合近几年学生参加科技竞赛实践的基础上,对基于学科竞赛的IT专业本科生、研究生创新意识与创新能力培养方式进行分析和总结。     

改革实验教学,培养工科研究生工程实践和创新能力

高层次人才的培养将在很大程度上决定一个国家,一个民族的前途和命运。培养有创新意识和工程实践能力的多学科复合型人才是社会对理工科院校提出的人才培养要求。通过对我校研究生教改项目“智能(自动化)系统工程实现技术教学改革与开放性实验基地建设”的研究和实践,探索出适合培养研究生工程实践和创新能力的教学内容、教学模式、教学方法及考试方法。     

TiAl基合金表面激光重熔MCrAlY涂层组织结构及抗氧化性

采用等离子喷涂工艺在TiAl基合金表面制备NiCoCrAl-Y2O3涂层.并用激光重熔工艺对涂层进行处理.用SEM、XRD对激光重熔前后的试样进行检测,分析了涂层的微观组织结构以及物相成分组成,同时对涂层进行高温氧化试验.结果表明,等离子喷涂后的涂层组织较致密,但仍存在孔洞等缺陷.激光重熔后涂层的组织结构进一步均匀、致密,晶粒得到细化.激光重熔过程中,涂层中Al元素上浮,并部分氧化生成Al2O3相.这两方面均可有效"阻碍"氧离子向内扩散和金属阳离子向外扩散,使重熔后涂层的高温抗氧化性能得到较大地改善.     

基于微波光子I/Q去斜接收的宽带线性调频雷达成像系统

该文提出一种新的基于微波光子I/Q去斜接收的宽带线性调频雷达成像系统方案。发射机利用微波光子倍频技术产生宽带线性调频信号,接收机利用偏分复用-双驱动马赫曾德尔调制器,将回波信号同时输入到两个不同偏振态的调制器上,并通过调节对应调制器的偏置电压在两偏振态之间引入90°相位差,从而实现微波光子I/Q去斜接收。此雷达在具备实时高分辨探测能力的同时,能区分参考点两侧的目标,解决了现有微波光子雷达接收机采用光子混频去斜接收中受镜频干扰导致距离向模糊的问题。该文首先论证了采用I/Q去斜接收的必要性,随后介绍了所提出的微波光子雷达结构与原理,最后开展了目标探测与逆合成孔径雷达成像的实验研究。该雷达工作在K波段,带宽为8 GHz。结果表明该系统可以有效解决镜频干扰引起的距离向模糊。      

超低相噪光电振荡器及其频率综合技术研究

该文提出一种基于级联相位调制器的注入锁定光电振荡器及其频率综合系统。该文提出的光电振荡器利用相位调制实现调制器输出光谱展宽并保持光纤中传播功率恒定,降低光纤非线性效应引入的强度噪声。采用双输出MZI级联平衡探测器的结构完成相位调制到强度调制的转化,提高系统的信噪比,实现频率为9.9999914 GHz、边模抑制比大于85 dB、10 kHz频偏相位噪声为–153.1 dBc/Hz的超低相位噪声信号输出。此外,还基于所提出的超低相位噪声光电振荡器构建了宽带、高性能频率综合系统。联合DDS和PLL的混合锁相技术,所提出频率综合器的输出频率成功覆盖5.9～12.9 GHz,相位噪声达到–130 dBc/Hz@10 kHz,杂散抑制比优于65 dB,跳频时间小于1.48 μs。      

基于光波分复用网络的分布式多目标定位系统

该文研究了基于光波分复用网络的分布式多目标定位系统,引入混沌光电振荡器实现宽带正交波形产生,引入光波分复用网络将分布式发射和接收单元的宽带信号传输回中心站进行信号处理,基于TOA (Time Of Arrival, 到达时间)定位方法实现对多目标的精确定位。多个光载波在中心站产生,中心站的资源可支撑复杂的高精度目标定位算法,远端发射和接收单元结构简单。进行了原理验证实验,构建了2个发射机、2个接收机的实验定位系统,基于混沌光电振荡器产生了频率范围为3.1～10.6 GHz的正交混沌波形。实现了对2个目标的2维定位,最大误差为7.09 cm,并对系统架构的可重构性进行了实验验证。      

飞行控制课程本研贯通式教学模式探索

飞行控制课程是北京航空航天大学独具特色的核心专业课程,开展该课程的教学创新改革是使学生掌握扎实专业知识、探索科学前沿的重要环节,对提高人才培养质量具有重要的意义。受到传统教学模式的影响,飞行控制本科生课程和研究生课程之间相互独立、不能有机衔接,本研培养分离。结合“本研贯通”培养模式的优势,对飞行控制课程进行教学改革探索,在课程内容贯穿性建设、实践教学一体化建设、多样化教学手段等方面进行改革创新,以加强飞行控制系列课程纵向深度建设,提升面向不同学生群体的飞行控制系列课程教学效果,实现本科和研究生两个培养阶段的有效衔接,促进学生知识、能力、实践、创新的系统训练和长程培养。     

Full-Rate Complex Orthogonal Space-Time Block Code for Multiple Antennas

In this paper, full-rate and complex orthogonal space-time block code (STBC) schemes for multiple antennas are proposed, and turbo code is employed as channel coding to improve the proposed STBC schemes performance further. Compared with full-diversity multiple antennas STBC schemes, the proposed schemes can implement full data rate, partial diversity and a smaller complexity. On the condition of the same system throughput and concatenation of turbo code, the proposed schemes have lower bit error rate (BER) than those low-rate and full-diversity code schemes.This work is supported by China Postdoctoral Science Foundation under grant No. 2005038242 and Chinese Jiangsu Planned Projects for Postdoctoral Research Funds. Xiangbin Yu received the M.S degrees in Communication and Information Systems from Hohai University, Nanjing, China, in 2001; and his Ph.D. in Communication and Information Systems in 2004 from National Mobile Communications Research Laboratory at Southeast University, China. Now he is working as a Postdoctoral Researcher in Information and Communication Engineering Postdoctoral Research Station at Nanjing University of Aeronautics and Astronautics, Nanjing, China. His research interests include multi-carrier digital communication, space-time coding, adaptive modulation and digital signal processing in communications. DaZhuan Xu received the M.S degrees and Ph.D. in Communication and Information Systems from Nanjing University of Aeronautics and Astronautics in 1986 and 2001, respectively. He is now a full professor in College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China. Prof. Xu is a Senior Member of China Institute of Electronics (CIE). His research interests include digital communications, soft radio, coding theory, medical signal processing. Guangguo Bi was graduated from Nanjing Institute of Technology, Nanjing, China, in 1960. He is now a professor in the Department of Radio Engineering of Southeast University, Nanjing, China. Prof. Bi is a fellow and a member of the board of Director of the China Institute of Communications, and a senior member of IEEE. His research interests include digital communications, personal communications network, spread spectrum communications, and intelligent information processing. He has published more than 200 papers in above areas.     

疫情期间偏理论工科课程线上教学研究

疫情期间，南京航空航天大学采取了线上教学的方法保证学生正常的学习生活。本文从偏理论的工科课程线上教学存在的问题入手，以疫情期间《工程电磁场》的线上教学为例，针对其提出“多位一体”的教学方式，阐述其组成及具体实施方法，说明该教学方式的良好效果，为偏理论的工科课程线上教学及今后线上线下联合教学提供借鉴。     

Performance Analysis of Multiband Complex Wavelet Based MC-CDMA System with Space Diversity Combining in Rayleigh Fading Channel

In this paper, the multiband complex wavelet used as multi-carrier basis function is optimized. On the basis of analyzing the principle of multi-carrier code division multiple access (MC-CDMA), a new multiband complex wavelet based MC-CDMA (MBCW-MC-CDMA) system model is proposed, and space diversity combining (SDC) technique is employed to improve the system performance further. The uplink performance of proposed MBCW-MC-CDMA system with SDC technique is investigated in Rayleigh fading channel, and corresponding bit error rate (BER) analysis is given in detail. Without any cyclic prefix (CP), the system can avoid the decrease of spectrum efficiency and data rate of conventional MC-CDMA with CP. By comparison, our scheme outperforms real wavelet packet based MC-CDMA and slightly outperforms conventional MC-CDMA with CP via utilizing superior properties of the optimized multiband complex wavelet. Theoretical analysis and simulation result show that the application of SDC technique can improve the proposed system ability to combat spatial fading and various interferences effectively. Moreover, the proposed system based on SDC technique has superior BER performance over conventional DFT and SDC based MC-CDMA system and real wavelet packet and SDC based MC-CDMA system. Xiangbin Yu received the M.S degrees in Communication and Information Systems from Hohai University, Nanjing, China, in 2001; and his Ph.D. in Communication and Information Systems in 2004 from National Mobile Communications Research Laboratory at Southeast University, China. Now he is working as a Postdoctoral Researcher in Information and Communication Engineering Postdoctoral Research Station at Nanjing University of Aeronautics and Astronautics, Nanjing, China. His research interests include multi-carrier digital communication, space-time coding and digital signal processing in modern communications. Xiaodong Zhang received the M.S degrees from Nanjing University of Posts and Telecommunications, Nanjing, China, in 1998. In 2002, he received the Ph.D. degree from Southeast University, Nanjing, China. His research interests include contemporary signal processing and digital communications. DaZhuan Xu received the M.S degrees and Ph.D. in Communication and Information Systems from Nanjing University of Aeronautics and Astronautics in 1986 and 2001, respectively. He is now a full professor in Nanjing University of Aeronautics and Astronautics, Nanjing, China. Prof.Xu is a Senior Member of China Institute of Electronics (CIE). His research interests include digital communications, soft radio, coding theory, medical signal processing. Guangguo BI was graduated from Nanjing Institute of Technology, Nanjing, China, in 1960. He is now a professor in the Department of Radio Engineering of Southeast University, Nanjing, China. Prof.Bi is a fellow and a member of the board of Director of the China Institute of Communications, and a senior member of IEEE. His research interests include digital communications, personal communications network, spread spectrum communications, and intelligent information processing. He has published more than 200 papers in above areas.     

Sensor location calibration for bearing estimation

New calibration methods are presented for bearing estimation with sensor location uncertainties, which are based on eigenvalue decomposition of the sample covariance matrix and three or more nondisjoint sources in known bearings. The methods can be applied to arbitrary arrays, including linear arrays, require fewer computations, and are suitable for low signal-to-noise ratio (SNR) cases. Computer simulations are given to illustrate the performance of the proposed methods.Supported by National Science and Technology Board of Singapore.On leave from the Department of Electronic Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People's Republic of China.     

"航空航天供电系统"课程物理仿真及计算机演示系统教学平台的建设

“航空航天供电系统”课程具有知识面宽、结合实际紧密、新概念多、理解困难等特点,为了搞好课程建设,更好地帮助学生从系统的角度学习和掌握该课程的知识,激发学生的学习热情,笔者设计了“航空航天供电系统”物理仿真及计算机演示系统教学平台。本文介绍该平台的硬件系统构成和演示软件。该平台成功地实现了科研成果与教学相结合,提高了教学效率,使教学质量和教学效果都上了一个台阶。