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A general altitude-dependent path loss model for UAV-to-ground millimeter-wave communications Research Articles
Qiuming Zhu, Mengtian Yao, Fei Bai, Xiaomin Chen, Weizhi Zhong, Boyu Hua, Xijuan Ye,zhuqiuming@nuaa.edu.cn,yaomengtian@nuaa.edu.cn,baifei@nuaa.edu.cn,chenxm402@nuaa.edu.cn,zhongwz@nuaa.edu.cn,byhua@nuaa.edu.cn,yexijuan@nuaa.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 6, Pages 767-776 doi: 10.1631/FITEE.2000497
Keywords： 传播损耗；无人机对地信道；毫米波通信信道；射线追踪；高度相关
Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications Research Article
Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 9, Pages 1378-1389 doi: 10.1631/FITEE.2200041
Keywords： Line-of-sight probability model Air-to-ground channel Machine learning Ray tracing
Study on wettability of tangential sections of moso bamboo with different pole heights
Zhang Qiaoling,Zhou Hongwei,Liang Tingbin,Tong Xueyan and Zeng Qinzhi
Strategic Study of CAE 2014, Volume 16, Issue 4, Pages 56-59
This paper studied the wettability of H2O，phenol formaldehyde adhesive (PF)，urea- formaldehyde adhesive (UF) and modified soy- based adhesive (MSA) in tangential sections of moso bamboo (Phyllostachys Pubescen) with different pole heights. Through measuring contact angles of four kinds of liquids on the tangential sections of moso bamboo，the dynamic wetting model was built，and the effects on the wettability of these liquids on the tangential sections with different pole heights and the differences of the wetting performance of these liquids on the tangential section of moso bamboo were analyzed.
Keywords： moso bamboo pole height tangential section contact angle wettability
HY-2A radar altimeter design and in flight results
Xu Ke,Liu Heguang,Jiang Jingshan
Strategic Study of CAE 2013, Volume 15, Issue 7, Pages 25-32
HY-2A is the first satellite for oceanic dynamic environment measurement of China. As one of main payloads of HY-2A, HY-2A radar altimeter has obtained successive measurement data after the launch. The accuracy of HY-2A radar altimeter is better than 4 cm (at 20 m significant wave height) or 2 cm (at 4 m significant wave height), which is close to that of Jason-2 satellite altimeter. In this paper, the design and in flight preliminary results of HY-2A radar altimeter are introduced.
Keywords： radar altimeter HY-2A satellite operation in flight
Design of altimeter sea surface height calibration buoy based on GPS
Chen Chuntao,Yan Longhao,Zhang Xiaoxu,Zhang Qian,Zhai Wanlin,Zhu Jianhua
Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 109-112
GPS buoy is the important instrument for the calibration of altimeter sea surface height. This paper introduces the composition and operating principle of GPS buoy, and describes in detail the design of shape, cabin, leak-proofness, and current supply. And finally used the numerical simulation, the rock and undulation of GPS buoy were experimented in the 3 class sea state condition. The result shows that designed GPS buoy can meet the challenge of altimeter sea surface height calibration on the sea experiment condition.
Keywords： Satellite altimeter calibration GPS buoy numerical simulation
Verification of HY-2 satellite radar altimeter wind retrieval
Jia Yongjun,Zhang Youguang,Lin Mingsen
Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 54-59
Sea surface wind speed has a very important role in the transfer of kinetic energy in the ocean, and the exchange of the matter and energy in the air-sea surface. The HY-2 satellite altimeter provides sea surface height, significant wave height, sea surface wind speed. And the accuracy of the wind speed affects the users’ application. In this study, the two-parameter algorithm is used to get the wind speed from HY-2 satellite radar altimeter. The correctness of this algorithm is calculated using the Jason-1 and HY-2 scatterometer data qualitatively. Three different methods(cross-over method, NDBC) are used respectively to evaluate this algorithm.
Keywords： wind speed retrieval two-parameter algorithm radar altimeter HY-2
Yang Rui,Zeng Bensheng,Li Shiqu
Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 60-65
The paper made an analysis of the similarities and differences about the cryptographic properties of two Boolean functions in the sense of linearly equivalence, and obtained a sufficient and necessary condition about a Boolean function linearly equivalent to some m order correlation-immune Boolean function. It also obtained a sufficient and necessary condition about a Boolean function linearly equivalent to some Boolean function satisfying the k order propagation criterion. Moreover, it showed an example,in which a given Boolean function, that is not correlation-immuned and does not satisfy the propagation criterion can be constructed into a correlation-immuned Boolean function that can satisfy the propagation criterion and is linearly equivalent to the former one.
Keywords： linear equivalence Walsh cycle spectrum self-correlation function correlation-immunity propagation criterion SAC
Research on the relationship between Hengsha land formation and development and relevant planning
Ruan Wei,Lou Fei
Strategic Study of CAE 2013, Volume 15, Issue 6, Pages 79-85
In this paper, on the basis of natural river regime evolution and relevant planning, the relationship ,between the Hengsha land formation and development and natural river regime evolution in the Yangtze river estuary,a number of plannings including integrated remediation project,waterway development,marine functional,environmental protection,land reclamation,port construction, has been researched.
Keywords： Yangtze river estuary Hengsha land formation and development relevant planning
HY-2A satellite radar altimeter error correction algorithm and verification
Zhang Youguan,Jia Yongjun,Fan Chenqing,Zhang Jie and Lin Mingsen
Strategic Study of CAE 2013, Volume 15, Issue 7, Pages 53-61
There are many factors affecting the height accuracy of satillite radar altimeter. The dry troposphere delays, wet troposphere delays, invert barometer delays, ionosphere delays, and sea state bias influence the computational accuracy directly. The error correction algorithms for the HY-2A satellite radar altimeter were conducted in this research. And, these algorithms were vertified using the more mature foreign satellite data such as Jason-1/2 and T/P. The results show that the HY-2A error correction algorithms can meet the accuracy requirements.
Keywords： altimeter error correction HY-2A satellite radar altimeter
Target height and multipath attenuation joint estimation with complex scenarios for very high frequency radar Research Articles
Sheng CHEN, Yongbo ZHAO, Yili HU, Chenghu CAO, Xiaojiao PANG
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6, Pages 937-949 doi: 10.1631/FITEE.2100003
for is a difficult problem due to the in the radar field, especially in where the reflection condition is unknown. To deal with this problem, we propose an algorithm of target height and multipath attenuation joint estimation. The amplitude of the surface reflection coefficient is estimated by the characteristic of the data itself, and it is assumed that there is no reflected signal when the amplitude is very small. The phase of the surface reflection coefficient and the phase difference between the direct and reflected signals are searched as the same part, and this represents the multipath phase attenuation. The Cramer-Rao bound of the proposed algorithm is also derived. Finally, computer simulations and real data processing results show that the proposed algorithm has good estimation performance under and works well with only one snapshot.
Keywords： Low-angle estimation Very high frequency (VHF) radar Complex scenarios Multipath effect Height estimation
Nonlinear Size-dependent Study of Ultra-thin Elastic Film With Surface Effect
Huang Dianwu,Li Yuanjun,Li Kai
Strategic Study of CAE 2006, Volume 8, Issue 4, Pages 54-59
A new nano-scale plate-like model in which the influence of surface effect and the geometrically nonlinear condition are considered is introduced on the basis of Mindlin theory. By using Hamilton's principle, the governing equations are derived. The residue membrane force and bending moment, which are caused by the surface stresses, are explicitly expatiated. After analyzing the membrane force and bending moment, it can be obtained that they are dependent on the deformation of the film and are accordant to classical plate theory. The model is then applied to analyze the bending and buckling of simply supported micro- and nano-films in plane strains . Differing from the conventional plate theory, the proposed model and solutions involve the intrinsic scale and depend on the thickness of the film. Thus, it can be found that when the thickness of,the film is equal to or less than the intrinsic scale, the surface effect is strongly sensitive to the thickness of the film.
Keywords： thin elastic film geometrically nonlinear surface effect intrinsic scale size-dependence
Frequency-domain Analysis of ECG Signals
Tu Chengyuan,Zeng Yanjun,Li Shuxin
Strategic Study of CAE 2002, Volume 4, Issue 12, Pages 66-70
A new simple approach to effectively detect QRS — T complexes in ECG curve is described, so as to easily get the P-wave (when AF does not happen) or the f-wave (when AF happens). By means of signal processing techniques such as the power spectrum function, the auto-correlation function and cross-correlation function, two kinds of ECG signals when AF does or does not happen were successively analyzed, showing the evident differences between them.
Keywords： ECG curve P-wave f-wave AF (atrial fibrillation) histogram power spectrum autocorrelation cross-correlation
An intuitive general rank-based correlation coefficient Research Articles
Divya PANDOVE, Shivani GOEL, Rinkle RANI
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 6, Pages 699-711 doi: 10.1631/FITEE.1601549
Keywords： General rank-based correlation coefficient Multivariate analysis Predictive metric Spearman’s rank correlation coefficient
Dynamic relationship analysis among parties of the low-carbon building
Liu Hongyong,Zheng Junwei,Lin Cheng
Strategic Study of CAE 2012, Volume 14, Issue 12, Pages 94-99
According to the definition of academic circles about low carbon building, the definition of this paper are made from the special aspect and general aspect combined with the understanding of the energy saving building and low carbon building. It systematically analyzes the stakeholders based on the perspective of life cycle, including government, developer, design organization, construction organization, provider, consultation unit, technology development institution, evaluation testing institution, department of property management and public, puts forward to the diagram of the relationships among the stakeholders, and designs the causal dynamic relationship diagram about each stage, which are decision making stage, design stage, construction stage, operation stage and scrap processing stage, and analyzes the dynamic relationship among the parties.
Keywords： low-carbon building stakeholders causal relation diagram dynamic analysis
Comparison of wind speed from 3 main payloads of HY-2 satellite
Jia Yongjun,Liu Jianqiang,Lin Mingsen,Zhang Youguang
Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 27-32
Sea surface wind speed has a very important role in the transfer of kinetic energy in the ocean, and the exchange of the matter and energy in the air-sea surface. There are three payloads on HY-2 satellite which can be used to detect the sea surface wind speed. The payloads are radar altimeter, microwave scatterometer and scanning microwave radiometer. The difference is that altimeter can measure the wind speed at the nadir point of the HY-2 satellite, microwave scatterometer can detect the wide swath wind field, and radiometer can measure the wide swath wind speed only. In order to analyze the capacity of the three payloads, in this study, the Usagi Typhoon is selected for comparing the ability of the three payloads to measure the wind speed. It turned out that when the wind speed is smaller than 20 m/s, the wind from altimeter is much the same as from microwave scatterometer. The standard deviation is less than 2 m/s. But when speed is between 20 m/s and 35 m/s, the wind speed of altimeter is close to the radiometer. Only the scanning microwave radiometer can be able to detect the wind speed larger than 35 m/s. Before using it to measure the wind speed larger than 35 m/s, we have to assess the accuracy of measurement.
Keywords： wind speed radar altimeter HY-2
Title Author Date Type Operation
A general altitude-dependent path loss model for UAV-to-ground millimeter-wave communications
Qiuming Zhu, Mengtian Yao, Fei Bai, Xiaomin Chen, Weizhi Zhong, Boyu Hua, Xijuan Ye,zhuqiuming@nuaa.edu.cn,yaomengtian@nuaa.edu.cn,baifei@nuaa.edu.cn,chenxm402@nuaa.edu.cn,zhongwz@nuaa.edu.cn,byhua@nuaa.edu.cn,yexijuan@nuaa.edu.cn
Journal Article
Machine learning based altitude-dependent empirical LoS probability model for air-to-ground communications
Minghui PANG, Qiuming ZHU, Zhipeng LIN, Fei BAI, Yue TIAN, Zhuo LI, Xiaomin CHEN
Journal Article
Study on wettability of tangential sections of moso bamboo with different pole heights
Zhang Qiaoling,Zhou Hongwei,Liang Tingbin,Tong Xueyan and Zeng Qinzhi
Journal Article
Design of altimeter sea surface height calibration buoy based on GPS
Chen Chuntao,Yan Longhao,Zhang Xiaoxu,Zhang Qian,Zhai Wanlin,Zhu Jianhua
Journal Article
Verification of HY-2 satellite radar altimeter wind retrieval
Jia Yongjun,Zhang Youguang,Lin Mingsen
Journal Article
The Characteristic of Spectrum and Self-correlation of Some Boolean Fuctions Linearly Equivalent to Specific Cryptographic Functions
Yang Rui,Zeng Bensheng,Li Shiqu
Journal Article
Research on the relationship between Hengsha land formation and development and relevant planning
Ruan Wei,Lou Fei
Journal Article
HY-2A satellite radar altimeter error correction algorithm and verification
Zhang Youguan,Jia Yongjun,Fan Chenqing,Zhang Jie and Lin Mingsen
Journal Article
Target height and multipath attenuation joint estimation with complex scenarios for very high frequency radar
Sheng CHEN, Yongbo ZHAO, Yili HU, Chenghu CAO, Xiaojiao PANG
Journal Article
Nonlinear Size-dependent Study of Ultra-thin Elastic Film With Surface Effect
Huang Dianwu,Li Yuanjun,Li Kai
Journal Article
An intuitive general rank-based correlation coefficient
Divya PANDOVE, Shivani GOEL, Rinkle RANI
Journal Article
Dynamic relationship analysis among parties of the low-carbon building
Liu Hongyong,Zheng Junwei,Lin Cheng
Journal Article
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