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Search Results: 1 - 10 of 39430 matches for " PENG Bi-Bo Key Laboratory of Dynamic Geodesy "
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Resolution estimation of Earth gravity field recovery through the low_low satellite to satellite technology by numerical simulation
数值模拟估算低低卫-卫跟踪观测技术反演地球重力场的空间分辨率

ZHOU Xu-Hua,WU Bin,XU Hou-Ze,PENG Bi-Bo Key Laboratory of Dynamic Geodesy,Institute of Geodesy & Geophysics,Chinese Academy of Sciences,Wuhan,China,
周旭华
,吴斌,许厚泽,彭碧波

地球物理学报 , 2005,
Abstract: 从两个方面模拟研究了低低卫-卫跟踪观测技术恢复地球重力场的空间分辨率.利用重力位系数作为扰动量,积分30天的轨道,研究重力位系数变化引起低低卫-卫跟踪星间距离和速率变化,结果表明,对于地球重力场模型EGM96的前12 0阶,99 8%和97%的位系数扰动引起星间距离和速率变化的均方差大于1×10 - 5m和1×10 - 7m s ,并且星间距离观测值对地球重力场的反应更为敏感.不考虑非保守力误差的影响,用随机误差为1×10 - 5m和1×10 - 6 m s的星间距离和速率变化作模拟观测量,恢复了78阶地球重力场位系数,结果表明,采用随机误差为1×10 - 5m的星间距离恢复地球重力场的精度明显高于1×10 - 6 m s的星间速率结果,但是如果考虑非保守力误差影响,则星间测速的优越性大大增强.
ON OCEAN HEAT CONTENT CHANGES BY USING SATELLITE ALTIMETRY DATA
利用卫星测高资料研究海水热含量变化

Mi Renhuan,Zhong Min,Yan Haoming,Peng Peng,Jiang Min Key Laboratory of Dynamic Geodesy,
米仁欢
,钟敏,闫昊明,彭鹏,江敏

大地测量与地球动力学 , 2009,
Abstract: The seasonal heat content changes over North Pacific and South China Sea during 2001 to 2007 are estimated by using satellite altimetry data,and compared with the results from the ECCO ocean model data.The results show that both in the local regions and the global area,the observations by using satellite altimetry agree well with that from the ECCO ocean model.
Wavelet inversion of pre-stack seismic angle-gather based on particle swarm optimization algorithm
基于粒子群优化算法的叠前角道集子波反演

YUE Bi-Bo,PENG Zhen-Ming,HONG Yu-Gang,ZOU Wen,
岳碧波
,彭真明,洪余刚,邹文

地球物理学报 , 2009,
Abstract: A novel method for pre-stack seismic wavelet extraction based on particle swarm optimization (PSO) algorithm is presented in this paper. Under the framework of basic PSO algorithm, a mean filter is introduced for updating velocity of particles in order to obtain the inversion results of global optimal wavelet. Seismic wavelet vector is described in the form of particle that is composed of many elements. If elements of a certain particle are independent of others, the particle velocity updating will be in disorder, which will have an adverse effect upon the process of searching for the optimal moving trajectory of particles. Three-point mean filter is used in the process of particle velocity updating and in that way the relationship among the elements of a certain particle is strengthened, which avoid particle velocity shifting and particles converge to the optimal solution quickly. The proposed algorithm in this paper was successfully performed for wavelet extraction in real pre-stack seismic data, which demonstrates that the improved PSO algorithm is efficient and feasible in seismic wavelet inversion.
Efficient and rapid estimation of the accuracy of GRACE global gravitational field using the semi-analytical method
基于半解析法有效和快速估计GRACE全球重力场的精度

ZHENG Wei,HSU Houtse,ZHONG Min,YUN Mei-Juan,ZHOU Xu-Hua,PENG Bi-Bo,
郑伟

地球物理学报 , 2008,
Abstract: In this paper,firstly,the new combined error model of cumulative geoid height influenced by three error sources including the inter-satellite range-rate of K-band ranging system,orbital position of GPS receiver and non-conservative force of accelerometer from GRACE satellites is established using the semi-analytical method.Secondly,the dependability of error models is demonstrated based on matching relationship among the accuracy indexes of key payloads.Finally,the accuracy of global gravitational field up to degree and order 120 is effectively and rapidly estimated from GRACE Level 1B measured observation errors of the year 2006 publicized by the Jet Propulsion Laboratory(JPL) in the USA,and the cumulative geoid height error is 18.368 cm at degree 120,which preferably accords with the Earth's gravitational field model EIGEN-GRACE02S provided by the GeoForschungsZentrum Potsdam(GFZ) in Germany.This work can provide theoretical foundation and calculational guarantee for the efficient and rapid estimation of the accuracy of high-degree global gravitational field model in the future international satellite gravity measurement mission(e.g.GRACE Follow-On,degree 360).
Demonstration on the optimal design of resolution indexes of high and low sensitive axes from space-borne accelerometer in the satellite-to-satellite tracking model
卫星跟踪卫星测量模式中星载加速度计高低灵敏轴分辨率指标优化设计论证

ZHENG Wei,XU Hou-Ze,ZHONG Min,YUN Mei-Juan,ZHOU Xu-Hua,PENG Bi-Bo,
郑伟

地球物理学报 , 2009,
Abstract: 本文利用改进的能量守恒法开展了GRACE星载加速度计与K波段星间测速仪及GPS接收机精度指标之间的匹配模拟论证. 结果表明:(1)采用GRACE公布的其他载荷精度指标,当加速度计分辨率指标设计为ACCX=(1~10)×10-9m/s2, ACCY,Z=(1~10)×10-10m/s2时,在120阶处恢复累计大地水准面的精度为19~80 cm,恢复1.5°×1.5°累计重力异常的精度为0.3~1.3 mGal;(2)建议我国将来卫星重力测量计划中星载加速度计三轴分辨率指标设计为ACCX=(1~5)×1010-9m/s2,ACCY,Z=(1~5)×10-10m/s2较合适,与GRACE其他载荷精度指标基本匹配.
Influence of the adjusted accuracy of center of mass between GRACE satellite and SuperSTAR accelerometer on the accuracy of Earth''''s gravitational field
GRACE星体和SuperSTAR加速度计的质心调整精度对地球重力场精度的影响

ZHENG Wei,XU Hou-Ze,ZHONG Min,YUN Mei-Juan,ZHOU Xu-Hua,PENG Bi-Bo,
郑伟许厚泽

地球物理学报 , 2009,
Abstract: 本文利用改进的能量守恒法开展了GRACE星体和星载加速度计检验质量的不同质心调整精度影响地球重力场精度的模拟研究论证.结果表明:第一,在120阶处,当质心调整精度设计为0 m,恢复累计大地水准面精度为17.616 cm;当质心调整精度分别设计为5×10-5m、1×10-4m和5×10-4m时,恢复精度各自降低至18.106 cm、19.033 cm和27.329 cm.第二,以德国GFZ公布的EIGEN-GRACE02S地球重力场模型的实测累计大地水准面精度为标准,当质心调整精度设计为(5~10)×10-5m时,其和K波段星间测量系统、GPS接收机、SuperSTAR加速度计、恒星敏感器等GRACE核心载荷的精度指标相匹配,对地球重力场恢复精度的影响较小,因此建议我国将来研制的首颗重力卫星的星体和星载加速度计检验质量的质心调整精度设计为(5~10)×10-5m较优.
Effective processing of measured data from GRACE key payloads and accurate determination of Earth''s gravitational field
GRACE卫星关键载荷实测数据的有效处理和地球重力场的精确解算

ZHENG Wei,HSU Houtse,ZHONG Min,YUN Mei-Juan,ZHOU Xu-Hua,PENG Bi-Bo,
郑伟
,许厚泽,钟敏,员美娟,周旭华,彭碧波

地球物理学报 , 2009,
Abstract: 首先对美国喷气推进实验室(JPL)公布的2007-06-01~2007-12-31时间段内的GRACE Level 1B卫星GPS轨道位置和速度、K波段系统星间速度、加速度计非保守力以及恒星敏感器姿态实测数据对应进行了轨道拼接、粗差探测、线性内插、重新标定、坐标转换、误差分析等有效处理;其次,基于改进的能量守恒法恢复了120阶GRACE地球重力场,在120阶处累计大地水准面精度为25.313 cm;最后,检验了本文地球重力场模型IGG-GRACE的可靠性,同时分析了IGG-GRACE解算精度在低频部分略优于德国波兹坦地学研究中心(GFZ)公布的EIGEN-GRACE02S地球重力场模型,而在中高频部分略低的原因.
Controlling Ginger Bacterial Wilt of Soil by Using RAPD Analysis
应用RAPD分析技术研究生姜青枯病的土壤防治

LU He,ZHANG Bi-Bo,
陆 合
,张碧波

微生物学通报 , 2009,
Abstract: 利用随机扩增多态性技术(RAPD)研究生姜连作地、施加有机肥后的生姜连作地及新开地中土壤微生物多样性与生姜青枯病的关系, 结果发现, 连作地的青枯病发病率为100%, 新开地没有发病, 而施加有机肥的连作地生姜青枯病发病率降至37%。发现施加有机肥连作地的真菌、放线菌数量增加, 平板上不同菌落形态的真菌、细菌、放线菌增加明显。多样性指数分析发现Shannon指数、Simpson指数等均显著增加。随机扩增条带出现连作地的条带丰富度较少、新开地的条带最多、施加有机肥连作地的RAPD条带明显多于连作地, 接近新开地, 并出现了一些连作地没有的特异条带。结果表明, 施加有机肥可以改善土壤微生物群落结构。
Role based Access Control Model
角色访问控制

MAO Bi-Bo SUN Yu-Fang,
毛碧波
,孙玉芳

计算机科学 , 2003,
Abstract: Role based access control (RBAC) was proposed in 70's, and prevailed in 90's, and then Sandhu etc proposed formal RBAC model. Now RBAC is attracting increasing attention, and many governmental and commercial organizations have adopted it, its importance is more and more apparent. In this paper we illuminates the distinctions and similarities of role and user groups, and based the model that was proposed by Sandhu, we examine the relationship of role hierarchies and role constraints and formally describes that, and explain the most important part of role constraints ,which is separation of duties.
Living System Theory of Agile Manufacturing Enterprise
敏捷制造企业的生命系统理论研究

XIONG Bin,QIAN Bi-bo,TAN Jian-rong,
熊斌
,钱碧波,谭建荣

系统工程理论与实践 , 2002,
Abstract: This paper applies living system theory to the study of agile manufacturing enterprise, proposes living system frame and semantic model of agile manufacturing enterprise, and analyses the living system characteristics of agile manufacturing enterprise.
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