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Forward link outage performance of aeronautical broadband satellite communications Research Articles
Huaicong Kong, Min Lin, Shiwen He, Xiaoyu Liu, Jian Ouyang, Weiping Zhu,linmin@njupt.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 6, Pages 790-801 doi: 10.1631/FITEE.2000445
Keywords： 航空宽带卫星网络；自由空间光传输；高通量毫米波通信；中断概率；相位误差
A comprehensive review of optical wireless power transfer technology Review
Syed Agha Hassnain MOHSAN, Haoze QIAN, Hussain AMJAD,Hassnainagha@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 6, Pages 767-800 doi: 10.1631/FITEE.2100443
Keywords： Wireless power transmission Optical wireless power transfer Distributed laser charging Laser diode Solar cell
Influence and hazard of disastrous space weather on power grid in China
liu Lianguang
Strategic Study of CAE 2010, Volume 12, Issue 9, Pages 29-33
The measured data of GIC in Guangdong Lingao 500 kV power networks during the several magnetic storms at the peak of 23rd Solar Cycle, the GIC calculation results of 2010 750 kV planning power grid in Shanxi, Gansu, Qinghai and Ningxia, the structure and characteristics of power networks from 500 kV to 1 000 kV, and super magnetic storm in 1859 are analyzed in this paper. Through the analysis, the possible impacts of extreme space weather on the future UHV, large-scale power system security in China are discussed, and the research suggestions coping with the strong solar storms are proposed.
Keywords： space weather magnetic storm GIC UHV power grid safety
Ni Guangjiong
Strategic Study of CAE 2003, Volume 5, Issue 3, Pages 90-92
In 2002 summer, a new book titled RECENT ADVANCES IN FASTER THAN LIGHT RESEARCH by Prof. Huang Zhixun was published, covering a wide field of theoretical and experimental progress in the faster than light research . The book is divided into three parts to discuss relevant research work in different areas, including theories and experiments on superluminal phenomena, anomalous dispersion and negative group velocity (especially the experiment of superluminal light pulse propagation by L. J. Wang et. al.), the achievements and paradoxes of wave-particle-duality theory, the EPR thinking and the research advance on neutrino´s mass, etc. This is a good book with novel and abundant contents, written in a concrete and vivid style and so it will be quite attractive to broad readers. In this paper a view-point that the academic free discussion is a prerequisite for the development of science is emphasized
Keywords： special relativity superluminal (Faster than light) neutrino
Improving the Performance of OFDM Channel Estimation through Subspace Projecting and Tracking
Dong Liang,Cao Xiuying,Bi Guangguo
Strategic Study of CAE 2006, Volume 8, Issue 11, Pages 86-93
The LS channel estimation of OFDM systems can be viewed as a noisy observation of the true channel frequency response, so the noise component can be compressed through subspace projecting. In this paper, the substance of the improvement of LS channel estimation is analyzed when subspace projecting is enforced, and the general framework to perform subspace projecting in the context of OFDM channel estimation is given, based on which this method is exterded to non-LS channel estimation. When signal subspace varies with time, subspace tracking should be performed to maintain a good estimation of signal subspace. At the end of this paper, a subspace tracking based parametric channel estimator is presented, and computer simulation shows that this channel estimator outperforms its nonparametric counterparts.
Keywords： OFDM subspace projecting tracking channel estimation
Development Strategy of Free Electron Laser Technology in China
Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun
Strategic Study of CAE 2020, Volume 22, Issue 3, Pages 35-41 doi: 10.15302/J-SSCAE-2020.03.006
Free electron laser (FEL) is a large-scale scientific research device based on electron linear accelerator and has been widely used in basic scientific research such as condensed matter physics, advanced materials and surface physics, atomic and molecular physics, chemistry, and biology. The advancement of FEL technology will promote the light sources to develop towards higher power and shorter wavelength to satisfy the increasing demands of users. This study introduces the necessity of development based on the characteristics of the FEL technology and summarizes the current development status of the technology in China and abroad. It also analyzes the existing problems in its development in China and proposes ideas and goals for the development of FEL technology in China. By 2035, China should focus on making breakthroughs in long-wave FEL, X-ray FEL, new FEL, and FEL-based extreme ultraviolet (EUV) lithography light source technologies. Based on the research and analysis, this study proposes some suggestions for the steady and healthy development of the FEL technology in China, including making scientific development strategies, raising investment in fundamental research to promote independent innovation, strengthening multi-party cooperation to promote the transformation of scientific and technological achievements, promoting market application, and strengthening personnel training.
Keywords： free electron laser infrared-terabertz FEL extreme ultraviolet-FEL X-ray FEL
Exploration and research of space physics and space weather
Wang Chi
Strategic Study of CAE 2008, Volume 10, Issue 6, Pages 41-45
Space physics is a fast-growing cross-discipline science with the advance of satellite technology since 1957. Space environment is becoming more and more important as the fourth living environment for human being. Starting from the early 1990s, space weather is born by applying the fundamentals of space physics to applications. The space weather study is aimed to investigate and alleviate the disaster effects of solar activity on our high-tech systems on the earth and in space. This report gives a brief summary of the history, current status and future direction of the international space physics and space weather exploration and study, and introduces the suggested space physics and space weather mid-long term development strategic plan and exploration roadmap.
Keywords： space physics space weather space physics exploration strategic plan
New stage and new tasks, development of microwave remote sensing in China
Jiang Jingshan,Wu Yirong,Liu Heguang,Dong Xiaolong
Strategic Study of CAE 2008, Volume 10, Issue 6, Pages 10-15
The development of microwave remote sensing technologies and their applications during the past 30-40 years, both in worldwide and in China, are reviewed and analyzed. Emphases are paid on the analyses of development status and increasing demand for microwave remote sensing in China in future tens of years. Based on the analyses, several strategic considerations and frontier technologies essential to future development and application are proposed.
Keywords： microwave remote sensing earth observation space exploration information processing
Chenxi Li, Lei Guan, Huaqing Wu, Nan Cheng, Zan Li, Xuemin Sherman Shen
Engineering 2022, Volume 17, Issue 10, Pages 220-231 doi: 10.1016/j.eng.2021.04.019
Heterogeneous cellular networks (HCNs) are envisioned as a promising architecture to provide seamless wireless coverage and increase network capacity. However, the densified multi-tier network architecture introduces excessive intra- and cross-tier interference and makes HCNs vulnerable to eavesdropping attacks. In this article, a dynamic spectrum control (DSC)-assisted transmission scheme is proposed for HCNs to strengthen network security and increase the network capacity. Specifically, the proposed DSC-assisted transmission scheme leverages the idea of block cryptography to generate sequence families, which represent the transmission decisions, by performing iterative and orthogonal sequence transformations. Based on the sequence families, multiple users can dynamically occupy different frequency slots for data transmission simultaneously. In addition, the collision probability of the data transmission is analyzed, which results in closed-form expressions of the reliable transmission probability and the secrecy probability. Then, the upper and lower bounds of network capacity are further derived with given requirements on the reliable and secure transmission probabilities. Simulation results demonstrate that the proposed DSC-assisted scheme can outperform the benchmark scheme in terms of security performance. Finally, the impacts of key factors in the proposed DSC-assisted scheme on the network capacity and security are evaluated and discussed.
Keywords： Heterogeneous cellular networks Dynamic spectrum control Transmission security Efficient data transmission
Coordinated Development of Space Science, Space Technology, and Space Application in China
Zhou Jianping, Wu Ji
Strategic Study of CAE 2023, Volume 25, Issue 2, Pages 59-66 doi: 10.15302/J-SSCAE-2023.02.007
Owing to historical reasons and investment restrictions, China’s aerospace industry initially focused on space technology and application, with insufficient emphasis on space science; therefore, space science, technology, and application developed independently. The development of space technology should be deeply integrated into space science and application, thus to strengthen China’s aerospace industry and create new opportunities and achievements. This study explores the implications of space science, space technology, and space application and clarifies their interrelationships. Moreover, it systematically analyzes the development trend in space science, technology, and application worldwide and reviews the development situation of space-related fields in China. Based on this, it examines the necessity for coordinating the development of space science, technology, and application in China and summarizes the major challenges. Considering their overlapping needs and mutual promotion, space science, technology, and application should be coordinated throughout the process of planning, deployment, and implementation. First, the advantages of the new national system should be exploited to conduct top-level planning under unified management. Second, the innovation-driven development strategy should be insisted to promote the international competitiveness of China’s aerospace industry through technological progress. Third, basic research in the space field should be strengthened and high-level scientists and engineers should be cultivated. Lastly, resource planning and coordination should be strengthened to promote the rational opening and full utilization of space application data.
Keywords： aerospace industry space science space technology space application coordinated development sharing of space data
Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2, Pages 300-306 doi: 10.1631/FITEE.1700056
A radio-over-fiber (RoF) distributed antenna system (DAS) architecture is proposed, where millimeter wave (mm-wave) signals are transmitted to four different radio access units (RAUs) arranged in a ring topology. The proposed architecture transmits duplex data of 128 Mb/s to each RAU in both downlink (DL) and uplink (UL) directions. The radio frequency (RF) signals are transmitted by polarization multiplexing a multi-wavelength source. Millimeter-wave signals at a frequency of 25 GHz are generated at each RAU using remote heterodyne detection. The proposed architecture provides increased coverage while maintaining good bit error rate (BER) results.
Keywords： Radio over fiber Millimeter wave Radio access units
An Engineering Method to Calculate Transmitting Effect of Aero-optics for Hypersonic Interceptor
Yin Xingliang
Strategic Study of CAE 2006, Volume 8, Issue 11, Pages 74-79
Transmitting effects of aero-optics is very important to optical imaging probing system of interceptor, as it may cause displacement, jitter and blurring of image to receive for the system. The optic transmitting characteristics is analyzed when target ray goes though turbulence flow. The engineering model for optical transmitting characteristics of flow is built up and empirical model for optical imaging system induced by aero-optic transmitting effects is described. The displacement, jitter and blurring are simulated. The numerical simulation results suggest that transmitting effect of aero-optics has powerful influence on the imaging probing system, which is related to flight parameters, imaging system parameters and integration periods of imaging probing system, etc.
Keywords： aerodynamics turbulent flows optics aero-optics transmitting effect
Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding
Strategic Study of CAE 2001, Volume 3, Issue 10, Pages 36-40
This paper analyzed the kinematics and dynamics of the 6-DOF platform, and adopted CMAC Neural Networks as controller to realize tailing track. Simulation results showed that the analysis of kinematics and dynamics was correct and the controller had the capabilities of resisting disturbance and good robustness.
Keywords： 6-DOF in-parallel platform CMAC neural network kinematics kinetics
A Review of the Basic Theory of Mimic Defense
Si Xueming,Wang Wei and Zeng Junjie、Yang Benchao、Li Guangsong、Yuan Chao、Zhang Fan
Strategic Study of CAE 2016, Volume 18, Issue 6, Pages 62-68 doi: 10.15302/J-SSCAE-2016.06.013
With the development of the Internet, cyberspace security issues have become a major concern related to national security. This paper first introduces some classic network defense technology. Next, it introduces the technology of mimic defense, including mimic defense systems, related scientific problems, and the theoretical framework of mimicry defense. The effectiveness of a mimic defense system is also analyzed in comparison with a traditional network defense technology. Finally, some problems worthy of study are presented regarding the basic theory of mimic defense.
Keywords： mimic defense cyberspace moving target defense mimicry transformation
Qin Wei,Qin Shuyu
Strategic Study of CAE 2007, Volume 9, Issue 1, Pages 49-52
In the digital manufacturing,information circulation of engineering graphics can be realized in a short time by Internet inside enterprise and among enterprises.Manpower,material and financial resources are economized through the method and mistakes and redundancy of data obtained are also be cut down to maximum extent.Based on the characteristic of correlation of graphics'geometry elements,long唱distance high efficiency and secure transmission of complex engineering graphics data is realized after parameter structure is built and data code compression and data encryption are put in practice at the same time by using BP algorithm of artificial neural network.Examples show that this method can be used in actual engineering.
Keywords： neural net BP algorithm correlation encrypt speed transmission graphics data
Title Author Date Type Operation
Forward link outage performance of aeronautical broadband satellite communications
Huaicong Kong, Min Lin, Shiwen He, Xiaoyu Liu, Jian Ouyang, Weiping Zhu,linmin@njupt.edu.cn
Journal Article
A comprehensive review of optical wireless power transfer technology
Syed Agha Hassnain MOHSAN, Haoze QIAN, Hussain AMJAD,Hassnainagha@zju.edu.cn
Journal Article
Influence and hazard of disastrous space weather on power grid in China
liu Lianguang
Journal Article
Academic Free Discussion is a prerequisite for the Development of Science——Qjmment on the Book Recent Advances In Faster Than Light Research
Ni Guangjiong
Journal Article
Improving the Performance of OFDM Channel Estimation through Subspace Projecting and Tracking
Dong Liang,Cao Xiuying,Bi Guangguo
Journal Article
Development Strategy of Free Electron Laser Technology in China
Li Peng, Li Ming, Wu Dai, Zhou Zheng, Tang Chun
Journal Article
New stage and new tasks, development of microwave remote sensing in China
Jiang Jingshan,Wu Yirong,Liu Heguang,Dong Xiaolong
Journal Article
Dynamic Spectrum Control-Assisted Secure and Efficient Transmission Scheme in Heterogeneous Cellular Networks
Chenxi Li, Lei Guan, Huaqing Wu, Nan Cheng, Zan Li, Xuemin Sherman Shen
Journal Article
Coordinated Development of Space Science, Space Technology, and Space Application in China
Zhou Jianping, Wu Ji
Journal Article
Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission to a ring of multiple radio access units
Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR
Journal Article
An Engineering Method to Calculate Transmitting Effect of Aero-optics for Hypersonic Interceptor
Yin Xingliang
Journal Article
Analysis of Characteristics and CMAC Neural Networks Controller of Electrohydraulic Servo System of the 6-DOF Paralle Platform
Zhai Chuanrun,ZhanXingqun,Zhang Yanhua,Ran Xianglai,Zhao Keding
Journal Article
A Review of the Basic Theory of Mimic Defense
Si Xueming,Wang Wei and Zeng Junjie、Yang Benchao、Li Guangsong、Yuan Chao、Zhang Fan
Journal Article
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