|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Direction-of-arrival estimation for uniform circular arrays under small sample size显示文摘With a small number of snapshots, performances of uniform circular array(UCA) root-MUSIC based methods for directionof-arrival(DOA) estimation suffer serious degradation, because the beamspace sample covariance matrix(BSCM) severely deviates from the true one. To solve this problem, an iterative technique is proposed. The proposed technique has two key points: transform array data into beamspace data and construct a BSCM; modify the BSCM repeatedly by removing the residual parts. Meanwhile,error and beamspace leakage associated with the BSCM are investigated. The proposed technique can significantly reduce the error and the beamspace leakage which in turn could improve the performance for DOA estimation. Simulation results are given to illustrate the superiority of the proposed technique for uncorrelated and correlated signals. | Guojun Jiang Xingpeng Mao Yongtan Liu | 2016 | Journal of Systems Engineering and Electronics2016，27，6： | 2 |
| 2 | Effective Sea Clutter Spectrum Extraction Method for HFSWR in Adverse Conditions显示文摘An effective approach in solving the sea clutter spectrum extraction problem is studied in the paper.Different from the conventional signal to noise ratio(SNR)method based on Doppler frequency or range domain information,a method is developed to characterize the differences between the sea echo and those interferences are by signal to interference plus noise ratio(SINR)which jointly utilizing the range,Doppler frequency and azimuth domain information.Furthermore,these differences can be adaptable to adverse conditions by forming the necessary boundaries and constraints in searching of the maximum SINR,which greatly promotes the extraction of sea clutter spectrum.The real high frequency surface wave radar(HFSWR)data demonstrate that the proposed method is less influenced by those interferences and can effectively extract the sea clutter spectrum even under the adverse conditions.Furthermore,it has been shown as an effective method for ship detection and sea state remote sensing of HFSWR. | Yiming Wang Xingpeng Mao Jie Zhang Yonggang Ji | 2017 | Journal of Beijing Institute of Technology2017，26，3： | 1 |
| 3 | Optimization design of fertilizer apparatus owned arc gears based on discrete element method显示文摘To improve the uniformity of the flow when fertilizer apparatus discharges fertilizer,a kind of fertilizer apparatus owned arc gears was designed.Also,the design and working principle of its general structure and key components were analyzed theoretically.Aiming at exploring the influence of arc structural parameters to the performance of arc gears discharging fertilizer,DEM simulation was used in this study.Fertilizer apparatus owned arc gears was taken as the research object to analyze the influence of two key components including the arc radius of gears’concave-grooves and the minimal length between two mutual meshing gears.The variation coefficient of fertilizer discharging amount stability and the linear determined coefficient of fertilizer discharging amount in unit time as evaluation index were selected.Two factors and five levels quadratic rotation orthogonal experiment was applied,and Design-Expert 8.0 software was used to achieve data processing and analysis.The results of experiment indicated that the arc radius of gears’concave-grooves had significant effect on the linear determined coefficient of fertilizer discharging amount in unit time,and the minimal length between two mutual meshing gears had significant effect on the variation coefficient of fertilizer discharging amount stability.The optimum structural parameters were 8.54 mm as the arc radius of gears’concave-grooves and 5.22 mm as the minimal length between two mutual meshing gears.Upon this circumstance,the variation coefficient was 0.28 and determination coefficient was 0.9972.The optimum apparatus was selected to conduct the bench test and field simulation test.The results indicated that the variation coefficient is 0.27,and the linear determined coefficient of is 0.9980.The results of simulation experiment were anastomotic basically with the real result,which showed that DEM simulation technology was usable to the experiment of testing fertilizer discharging.The results of this research can provide a reference to the improving of performance in discharging fertilizer. | Guoqiang Dun Zhiyong Gao Yuxuan Liu Wenyi Ji Ning Mao Xingpeng Wu Wenhui Liu | 2021 | International Journal of Agricultural and Biological Engineering2021，14，2： | 1 |
| 4 | Radio disturbance of high frequency surface wave radar显示文摘 | Mao Xingpeng Liu Yongtan Deng Weibo | 2004 | Electronics letters2004，40，3： | 1 |
| 5 | Radio disturbance of high frequency surface wave radar显示文摘 | Liu Yongtan Deng Weibo | 2004 | Electron Lett2004，40，3： | 1 |
| 6 | A generalized oblique projection filter with flexibleparameter for interference suppression 显示文摘 | WANG Yiming MAO Xingpeng HONG Hong etal | 2014 | Interna-tional Journal of Antennas and Propagation2014，，： | 1 |
| 7 | Model construction of soybean average diameter and hole parameters of seed-metering wheel based on DEM显示文摘To satisfy the demands of soybean precision sowing,this article starts with statistics of the physical parameters of soybean seeds in Heilongjiang province,China.The filling process of soybean seeds was analyzed,and the ratio relationship between the diameter,depth,chamfer length of seed-metering wheel’s holes and the mean diameter of soybean seeds was determined.EDEM was used to simulate seeding circumstances of hole seed-metering wheel with different holes’sizes.The hole diameter ratio,hole depth ratio,and chamfer length ratio were the test factors,while the percentage of single multiple and the empty seeds were test indexes.The triple quadratic regression orthogonal rotation combination test was designed,and the mathematical model between test indexes and test factors was established.Results showed that the influence of hole diameter ratio and hole depth ratio was significant(p<0.01)in the case of single,multiple and empty seed percentage while chamfer length ratio was only significant in single seed percentage compared to multiple and empty seeds percentage(p>0.05).The chamfer length ratio was 0.15,the hole diameter ratio was 1.63-1.73,the hole depth ratio was 0.81-1.20,the quality of seeding index was more than 90,and multiple and missing indexes were less than 6%and 4%,respectively.The soybean hole wheel seeding device was produced under the optimal parameter combination,to perform a comparative verification test with non-optimized parameters.The test showed anastomotic simulation results,verified the validity of the simulation.The seeding device after optimization expressed the best operating performance,which might satisfy the demands of soybean precision sowing.The study results can provide a theoretical reference for the optimization design of soybean seeding devices. | Guoqiang Dun Ning Mao Zhiyong Gao Xingpeng Wu Wenhui Liu Cheng Zhou | 2022 | International Journal of Agricultural and Biological Engineering2022，15，1： | 0 |
| 8 | IDMA based MAI mitigation scheme with low complexity and low latency显示文摘High complexity and high latency are key problems for multiuser detection (MUD) to be applied to a mobile station in cellular networks. To tackle these problems, an interleave division multiple access (IDMA) based multiple access scheme, grouped spread IDMA (GSIDMA), is proposed. In a GSIDMA system, lower complexity and latency for mobile stations can be achieved by appropriately dividing active users into different groups. The system model of GSIDMA is constructed and followed by analysing on its system capacity, complexity and latency, and bit error rate (BER) performance. The extrinsic information transfer (EXIT) chart is used to analyze the convergence behavior of the iteration process. The grouping method and interleavers-reuse issue for GSIDMA are also discussed preliminarily. The analyses and simulation results indicate that the complexity and latency of the proposed scheme are much lower than those of IDMA, whereas its BER performance is close to the latter. The properties of low complexity and low latency make it more feasible for the practical implementation. | Zuoliang Yin Xingpeng Mao Jun Cai Naitong Zhang | 2012 | Journal of Systems Engineering and Electronics2012，23，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员