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| 1 | High precision landing site mapping and rover localization for Chang'e-3 mission显示文摘This paper presents the comprehensive results of landing site topographic mapping and rover localization in Chang’e-3 mission.High-precision topographic products of the landing site with extremely high resolutions(up to 0.05 m)were generated from descent images and registered to CE-2 DOM.Local DEM and DOM with 0.02 m resolution were produced routinely at each waypoint along the rover traverse.The lander location was determined to be(19.51256°W,44.11884°N,-2615.451 m)using a method of DOM matching.In order to reduce error accumulation caused by wheel slippage and IMU drift in dead reckoning,cross-site visual localization and DOM matching localization methods were developed to localize the rover at waypoints;the overall traveled distance from the lander is 114.8 m from cross-site visual localization and 111.2 m from DOM matching localization.The latter is of highest accuracy and has been verified using a LRO NAC image where the rover trajeactory is directly identifiable.During CE-3 mission operations,landing site mapping and rover localization products including DEMs and DOMs,traverse maps,vertical traverse profiles were generated timely to support teleoperation tasks such as obstacle avoidance and rover path planning. | LIU ZhaoQin DI KaiChang PENG Man WAN WenHui LIU Bin LI LiChun YU TianYi WANG BaoFeng ZHOU JianLiang CHEN HongMin | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，1： | 15 |
| 2 | Landing site topographic mapping and rover localization for Chang’e-4 mission显示文摘This paper presents the techniques and results of landing-site topographic mapping and rover localization using orbital,descent and rover images in the Chang’e-4 mission.High-resolution maps of the landing site are generated from orbital and descent images.Local digital elevation models and digital orthophoto maps with 0.02 m resolution are generated at each waypoint.The location of the lander is determined as(177.588?E,45.457?S)using festure-matching techniques.The cross-site visual localization method is routinely used to localize the rover at each waypoint to reduce error accumulation from wheel slippage and IMU drift in dead reckoning.After the first five lunar days,the rover travels 186.66 m from the lander,according to the cross-site visual localization.The developed methods and results have been directly utilized to support the mission’s operations.The maps and localization information are also valuable for supporting multiple scientific explorations of the landing site. | Zhaoqin LIU Kaichang DI Jian LI Jianfeng XIE Xiaofeng CUI Luhua XI Wenhui WAN Man PENG Bin LIU Yexin WANG Sheng GOU Zongyu YUE Tianyi YU Lichun LI Jia WANG Chuankai LIU Xin XIN Mengna JIA Zheng BO Jia LIU Runzhi WANG Shengli NIU Kuan ZHANG Yi YOU Bing LIU Jiangang LIU | 2020 | Science China(Information Sciences)2020，63，4： | 3 |
| 3 | Fuzzy-based algorithm for color recognition of license plates显示文摘 | Wang Feng Man Lichun Wang Bangping | 2008 | Pattern Recognition Letters2008，，29： | 1 |
| 4 | Fuzzy- based algorithm for color recognition of license plates显示文摘 | Wang Feng Man Lichun Wang Bangping | 2008 | Pattern Recognition Letters2008，29，7： | 1 |
| 5 | Fuzzy-based algorithm for color recognition of license plates显示文摘 | Feng Wang Lichun Man Bangping Wang Yijun Xiao Wei Pan Xiaochun Lu | 2008 | Pattern Recognition Letters2008，，7： | 1 |
| 6 | Fuzzy-based algorithm for color recognition of license plates显示文摘 | Feng Wang Lichun Man Bangping Wang Yijun Xiao Wei Pan Xiaochun Lu | | 0，，： | 1 |
| 7 | Effect of neodymium doping on structure,magnetic properties and microwave absorption performance of SrMnO_(3)显示文摘A simple composite Sr_(1-x)Nd_(x)MnO_(3)(x=0,0.05,0.1,0.15,0.2) nano powders were successfully prepared by the sol-gel method as a light-weight broadband electromagnetic wave absorber.The effect of Nd^(3+)doping on the structure,microstructure and properties of SrMnO_(3) was investigated.It is found that with the doping of Nd^(3+),the space group of the SrMnO_(3) changes from p63/mmc to pm3m,and the crystalline shape starts to change from hexagonal to cubic crystalline.Scanning electron microscopy(SEM) and Brunauer-Emmett-Teller(BET) tests confirm that the particle sizes of the sample decrease and the specific surface area increases,which are attributed to the inhibition of grain growth after Nd^(3+)is doped.X-ray photoelectron spectroscopy(XPS) shows that after Nd^(3+)doping,the content of oxygen vacancy increases,and Mn^(4+) converts to Mn^(3+).Due to the defects of the materials,the polarization effect is enhanced,thus,the dielectric and magnetic properties of the doped samples are improved.The maximum reflection loss of the Sr_(0.85)Nd_(0.15)MnO_(3) is-33.41 dB at 7.84 GHz for a thickness of 2.4 mm,while Sr_(0.9)Nd_(0.1)MnO_(3) has the best bandwidth performance at 2.32 GHz with a reflection loss below-10dB. | Jixiang Yue Lichun Cheng Jilei Xiong Qingrong Yao Man Wang Yucheng Chen Qianxin Long Xiaojian Guo | 2024 | Journal of Rare Earths2024，42，2： | 0 |
| 8 | Influence of A-site doping barium on structure,magnetic and microwave absorption properties of LaFeO_(3)ceramics powders显示文摘In this paper,the effect of Ba^(2+)ions A-site doping LaFeO_(3)on structure,magnetic properties and microwave absorption properties was investigated by the sol-gel method.According to the TEM and FullProf refinement results,the structure of LaFeO_(3)changes from orthogonal(SG:Pnma)to cubic(SG:Pm-3 m)when the Ba doping amount is x=0.4.The SEM image shows that the particles size tends to decrease with the increase of Ba content.The production of weak ferromagnetism indicates that Ba doping has a significant effect on the magnetic properties of LaFeO_(3).The Neel temperature(TN)decreases significantly with the increase of Ba doping amount.An appropriate amount of Ba doping can effectively increase the dielectric and magnetic loss of LaFeO_(3)ceramics powders.The increase permittivity(ε’andε″)may be attributed to the hopping of the electrons between the Fe^(3+)and Fe^(4+)ions with the Ba^(2+)ions doping.The minimum reflection loss(RL_(min))of La_(0.9)Ba_(0.1)FeO_(3)at 6.72 GHz reaches-30.04 dB,its effective bandwidth(RL≤-10 dB)is 2.1 GHz,and the matching thickness is only 3.2 mm.These results indicate that Ba doping can effectively control the microwave absorption properties of LaFeO_(3),especially in the Cband. | Lei Huang Lichun Cheng Shunkang Pan Qingrong Yao Qianxin Long Man Wang Yucheng Chen Huaiying Zhou | 2022 | Journal of Rare Earths2022，40，7： | 0 |
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