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APPLICATION OF SEPARABILITY ORITERION IN DESIGN OF DEFORMATION MONITORING NETWORKS
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作者 CHEN Yongqi TANG Hongwai 《Geo-Spatial Information Science》 1998年第1期70-73,共4页
A monitoring scheme must be so designed that several possible mod-els can be efficiently separated in the stage of analysis of deformation measure-ments.Based on the concept of separability developed by Chen and Chrza... A monitoring scheme must be so designed that several possible mod-els can be efficiently separated in the stage of analysis of deformation measure-ments.Based on the concept of separability developed by Chen and Chrzanowski,a methodology for the design of monitoring schemes has been developed by the au-thors.In the method a computer simulation technique is employed,into whichsome rules have been elaborated allowing minimal human intervention.In this pa-per the criterion is first presented and the design technique using the step one up-dating procedure is discussed.Finally,design of a simulated monitoring networkis made as a demonstrating example. 展开更多
关键词 OPTIMAL DESIGN DEFORMATION MONITORING NETWORK SEPARABILITY
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OUTLIER DETECTION AND RELIABILITY OF ADJUSTMENT MODELS WITH SINGULAR COVARIANCE MATRICES 被引量:1
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作者 WANG Jinling CHENG Yongqi TAO Benzao 《Geo-Spatial Information Science》 1998年第1期55-59,共5页
Up to now,outlier detection and reliability theory are generallybased on the regular Gauss-Markov models,in which the covariance matrix of ob-servations is positively definite.For the adjustment models with singular c... Up to now,outlier detection and reliability theory are generallybased on the regular Gauss-Markov models,in which the covariance matrix of ob-servations is positively definite.For the adjustment models with singular covari-ance matrix,the statistics for outlier detection are derived by the authors.Thecorresponding reliability theory is developed.And the application of the theory isdemonstrated with a practical example. 展开更多
关键词 SINGULAR adjustment MODELS OUTLIERS RELIABILITY THEORY
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A MORE GENERAL FORM OF ERROR DISTRIBUTION
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作者 SUN Haiyan 《Geo-Spatial Information Science》 1998年第1期50-54,62,共6页
This paper deduced a more general error distribution,the p-th pow-er norm distribution,based on the foundational properties of random errors.
关键词 p-th power norm DISTRIBUTION DISTRIBUTION density FUNCTION (d. d. f. ) least SQUARES method (LSM) least SQUARES ESTIMATION (LSE) MAXIMUM LIKELIHOOD method (MLM) MAXIMUM LIKELIHOOD ESTIMATION (MLE) characteristic FUNCTION (c. f. )
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THE ESTIMATION OF VARIANCE AND COVARIANCE COMPONENTS FOR GPS BASELINE NETWORK BY MINQUE METHOD
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作者 WANG Xinzhou LIU Jingnan TAO Benzao 《Geo-Spatial Information Science》 1998年第1期63-69,73,共8页
This paper studies the estimation of variance and covariance compo-nents for GPS baseline network by MINQUE method.The fundamental rule forselecting variance-covariance model has been presented,and the alternative alg... This paper studies the estimation of variance and covariance compo-nents for GPS baseline network by MINQUE method.The fundamental rule forselecting variance-covariance model has been presented,and the alternative algo-rithm which simultaneouly estimates fixed variance components and scalled vari-ance components of the distance,azimuth and geodetic height difference for a GPSbaseline vector has been developed. 展开更多
关键词 GPS BASELINE VECTOR variance and COVARIANCE ALTERNATIVE ESTIMATION MINQUE METHOD
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APPLICATION OF THE HARTLEY TRANSFORM IN THE COMPUTATION OF THE GEOID IN CHINA
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作者 NING Jinsheng LI Jiancheng CHAO Dingbo 《Geo-Spatial Information Science》 1998年第1期43-49,共7页
This paper presents a method for the computation of the Stokes for-mula using the Fast Hartley Transform(FHT)techniques.The algorithm is mostsuitable for the computation of real sequence transform,while the Fast Fou... This paper presents a method for the computation of the Stokes for-mula using the Fast Hartley Transform(FHT)techniques.The algorithm is mostsuitable for the computation of real sequence transform,while the Fast FourierTransform(FFT)techniques are more suitable for the computaton of complex se-quence transform.A method of spherical coordinate transformation is presented inthis paper.By this method the errors,which are due to the approximate term inthe convolution of Stokes formula,can be effectively eliminated.Some numericaltests are given.By a comparison with both FFT techniques and numerical integra-tion method,the results show that the resulting values of geoidal undulations byFHT techniques are almost the same as by FFT techniques,and the computation-al speed of FHT techniques is about two times faster than that of FFT techniques. 展开更多
关键词 FHT FFT NUMERICAL INTEGRATION
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Using repeated precise gps campaigns for research of present-day crustal movement and strain in the Qinghai-Tibetan Plateau 被引量:8
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作者 LIU Jingnan XU Caijun +3 位作者 SONG Chenghua SHI Chuang JIANG Weiping DONG Lixiang 《Chinese Science Bulletin》 SCIE EI CAS 2001年第8期694-698,共5页
The problem of crustal movement in the Qing-hai-Tibetan Plateau is a hotstopic of the present-day international geodetic world. GPS observations in 1993, 1995 and 1997 are used to survey the three-dimensional displace... The problem of crustal movement in the Qing-hai-Tibetan Plateau is a hotstopic of the present-day international geodetic world. GPS observations in 1993, 1995 and 1997 are used to survey the three-dimensional displacement of GPS monitoring station in the Qinghai-Tibetan Plateau, and to calculate and analyze the present-day crustal movement and strain in the Qinghai-Tibetan Plateau. The result of repeated campaign shows that the crustal movement in the Qinghai-Tibetan Plateau is still compressing in the north and south directions, extending in the west and east directions, and uplifting in the vertical direction. The relative convergence velocity of the Himalayan block is approximately (19.5±1.7)mm/a, the strain velocity is about (5.5±6.0) mm/a, and the uplifting velocity is some (7.6±5.2) mm/a. The compression velocity of the Tibet block relative to Golmud in the north and south directions is (9.3±4.6) mm/a, the strain velocity of the middle part in the west and east directions is (15.6±6.3) mm/a, 展开更多
关键词 GPS SURVEYING Qinghai-Tibetan Plateau CRUSTAL move- ment STRAIN analysis.
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