大地测量与地球动力学
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Current Issue
2013 Vol.33 Issue.1
Published 2013-02-19
地壳形变与地震
1
RELATION BETWEEN CRUSTAL VERTICAL MOTION AND 〖JZ〗EARTHQUAKE IN YUNNAN AREA
Guo Liangqian;Ta La;Chen Fucao;Zhou Haitao;Chen Juzhong;and Bo Wanju
On the basis of the multiphase releveling data of Yunnan area obtained from 1951 to 2011, the vertical variation rate chart of 1951-1980, 1980-1994, 1994-2011 and 1951-2011 been drawn. Through combining the earthquakes happened in this area, the relationship between the vertical variation and the earthquake had been researched as well. The results indicate that the earthquakes of stronger than 7 level were mainly happened in rising area. The earthquake mostly happened in the area of positive value in rate field of incremental vertical deformation.
2013 Vol. 33 (1): 1-5 [
Abstract
] (
1360
)
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6
CALCULATION AND ANALYSIS OF THREEDIMENSIONALCO-SEISMIC DEFORMATION FIELD CAUSED BY XINJIANGYUTIAN Mw7.2 EARTHQUAKE
Hong Shunying;Shan Xinjian;Liu Zhirong;Shen Xuhui;Dai Yaqiong;and Jing Feng
On the basis of the elastic halfspace model of OKADA, and under the constraint of interferograms, We obtained the parameters of three subfaults and simulative threedimensional(3D) deformation field of the Yutian Mw7.2 earthquake, Xinjiang. Furthermore, combining the simulative North direction deformation field with the interferograms of ascending and descending oribt, we calculated out the deformation fields in vertical and east direction.At last, we analyzed the characteristics of 3D coseismic deformation field of the Yutian earthquake. The analysis shows that in the vertical direction, the west wall of the fault subside with maximal value about -1097 cm, but the east wall uplifted with maximum value about 19.2 cm, and the dominant subsiding deformation feature indicates the mostly normal rupture feature of the earthquake; in the eastwest direction, the west wall majorly moved west wards with maximal value about -51.4 cm, but the east wall majorly moved east wards with maximal value about 98.5 cm; in the northsouth direction, the west
wall majorly moved south wards with maximal value about -665 cm, but the east wall majorly moved north wards with maximal value about 25.8 cm. The synthetic horizontal deformation field indicates that the west wall of the fault striked slip south wards, but east wall north wards.These characteristics reveal that the fault of Yutian Mw6.2 earthquake
appeared with some sinistral strikeslip with the obvious normal.
2013 Vol. 33 (1): 6-12 [
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] (
1317
)
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13
IONOSPHERIC ELECTRON DENSITY ANOMALIES DETECTED BY BP ARTIFICIAL NEURAL NETWORK BEFORE WENCHUAN EARTHQUAKE
Xiong Jing;;Wu Yun;;and Lin Jian;
On the basis of the F2 layer peak electron density(NmF2) from University Corporation for Atmospheric Research(UCAR), we constructed a Back Propogation(BP) artificial neural network(ANN) in order to detect preearthquake anomalies for the first time. The ANN provides NmF2 model value with five parameters:DOY,local time(LT), longitude(LON), latitude(LAT) and solar activity index of F10.7(FLUX). We compare the model value with observations during the Wenchuan earthquake. It is found that NmF2 around the forthcoming epicenter decreased remarkably in the afternoon period of day 6-4 before the earthquake, but enhanced day 3-2 before the earthquake.
2013 Vol. 33 (1): 13-16 [
Abstract
] (
1374
)
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17
SIMULTANEOUS INVERSION OF MULTI-LAYERDENSITY INTERFACE
Wang Sun;;and Shen Chongyang;
This paper is proposes a new method for inversing the multilayer density interfaces directly,the novel approach is based on the smooth constraining of density distribution. The purposes of the study are to compress the entire solution space and to lighten the image quality of the inversion result. The results of the theoretical model and field section show that this method is effective and can obtain a better geological interpretation than tradition ones.
2013 Vol. 33 (1): 17-20 [
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] (
1327
)
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21
ANALYSIS OF RELIABILITY AND STABILITY OF INVERSION RESULT WITH NEGATIVE DISLOCATION MODEL OF DEFNODE
Zhao Jing;Jiang Zaisen ;Wu Yanqiang ;Liu Xiaoxia ;Wei Wenxin ;Wang Yuebing ;Li Qiang ; and Xu Jing
Using analog data and measured GPS velocity field, we analyzed the influence of different fault dip angles, different weight f and data spatial distribution on the negative dislocation inversion program of Defnode. The inversion results of analog data show that the inversion results both have a high degree of reliability under conditions of low dip angle and high dip angle.Measured GPS velocity field inversion results of the Longmenshan fault zone show that they have good stability and the weight f has little influence on the inversion results, and the distribution of GPS observation stations (especially the quantity and location of stations near the fault zone) has certain influence on the inversion results, but it can not change the fact that the southern segment is a little less locked than the middlenorthern segment.
2013 Vol. 33 (1): 21-24 [
Abstract
] (
1548
)
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25
ANALYSIS OF ABSOLUTE GRAVITY DETERMINATION AT FIDUCIAL STATIONS NEAR OCEAN
Zhang Hongwei;Xiao Fan;He Zhitang ;Wang Yingjian;Zhao Dongming ;and Xia Chen
The FG5 absolute gravimeter was applied to the absolute gravity measurement at the 12 absolute gravity fiducial stations of the Crustal Movement Observation Network of China near the ocean. The Earth tide and ocean loading correction were analyzed in the absolute gravity determination. As a result, the FG5 absolute gravimeter at Shanghai fiducial station precisely detected the coseismic response to Japan Ms6.0 earthquake. The standard deviation of Set Scatter of all stations was proved to be better than 5×10
-8
ms
-2
.
2013 Vol. 33 (1): 25-28 [
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] (
1380
)
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29
TEMPORAL AND SPATIAL EVOLUTION CHARACTERISTICS OF FAULT ACTIVITY BEFORE AND AFTER ZHANGBEI Ms6.2 EARTHQUAKE
Li Layue;;Xing Chengqi;Wu Anxu;and Hu Leyin
We analyzed 24 observational data of temporary faultcrossing leveling measurement in the Capital region of China and calculated the vertical fault deformation rate.With the principal component analysis method, we made a rate synthesizing from the vertical fault displacement rate in the study area, and then carried out a deep analysis of the deformation anomaly characteristics before and after the Zhangbei earthquake in the view from space and time. The results show that the part of stations in the Capital Region had some certain anomalies before the Zhangbei earthquake. In the view from time, the observation curves generally began to appear acceleration or turning simultaneously from 1994, the earthquake broke out after restoring to its original level, or exception to the maximum. From the point of space, 2 to 3 years before the earthquake the studied area as a whole converted to pressure from the tensile, and gradually formed a pressure zone around the epicenter area and the pressure gradually decreased in the area far from the epicenter. After the Zhangbei earthquake, the studied area emerged a wide range of tensile in a relatively stable spatial distribution, which may be related to the full release of the stress.
2013 Vol. 33 (1): 29-34 [
Abstract
] (
1407
)
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35
TIDAL EFFECT OF WATER LEVEL OF CONFINED ANDNON-CONFINED WELL AND IT’S QUANTITATIVE ANALYSIS
Liu Xuyan;Zheng Xiaojing;Chen Ying;Zhang Qingxiu;and Wang Lin
The tital effect of water level of confined and nonconfined well are studied and a quantitative analysis method is given.
2013 Vol. 33 (1): 35-39 [
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] (
1155
)
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理论方法研究
40
RESEARCH ON PERTURBATION ANALYSIS OF THE TOTAL LEAST SQUARES
Wang Leyang;
On the basis of the condition number definition of coefficient matrix and from the viewpoint of numerical analysis, the perturbation analysis equations of least squares (LS) and data least squares (DLS) are deduced,
in following cases when the perturbation is only contained in the observation data, the perturbations are contained in the observation data and coefficient matrix, and the perturbation is only contained in the coefficient matrix. On the basis of the closedform expression of the total least squares (TLS) solution and with the tool of the singular value decomposition (SVD), the perturbation analysis equation of TLS is deduced. Through the analysis, the perturbation analysis equation of TLS is the unified form of the perturbation analysis equation of LS and DLS.
2013 Vol. 33 (1): 40-44 [
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] (
1365
)
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45
PARAMETERS ESTIMATION OF AUTOREGRESSION WITH STRUCTURED TOTAL LEAST SQUARES
Hu Chuan ;and Chen Yi;
The structured total least squares not only take into account the errors of coefficient but also consider the identical elements have attained the same correction value in coefficient or in argument of vector of observation
L
and coefficient matrix
A
. This method make the adjustment theory more strict than others such as least squares and total least squares.In this contribution that we give an simply iteration algorithm for structured total least squares,and give a numerical example to demonstrate the efficiency and feasibility,as well as the advantages of the structured total least squares for AutoRegresion parameters estimation at last .
2013 Vol. 33 (1): 45-47 [
Abstract
] (
1355
)
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48
AN IMPROVED WEIGHTED TOTAL LEAST SQUARES ALGORITHM
Yang Shiping ;Fan Dongming ;and Long Yuchun
In connection with the problem of EIV model’s coefficient matrix containing repetitive elements, The author improves the available weighted total least squares method through making the repeat element’s correction equal,taking into account the correlation between the elements of coefficient matrix, Then, the improved method is applied to the linear fitting,
to solve the small rotation angle of 3D datum transformation model.The examples show that, compared with toprevious parameter estimation methods, the improved weighted total least squares (IWTLS ) method can obtation a more rational residual matrix of coefficient matrix.
2013 Vol. 33 (1): 48-52 [
Abstract
] (
1497
)
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53
ACCURACY ANALYSIS OF TWO GPS BROADCAST EPHEMERIS FITTING AND EXTRAPOLATION ALGORITHM
Dai Xiaolei;Lou Yidong;and Li Wen
A parameter fitting algorithm was studied for the current broadcast ephemeris and the modernizing broadcast ephemeris which were used to analyze the orbit fitting accuracy and orbit extrapolating accuracy respectively. It was shown that the 18parameter algorithm is an order of magnitude higher than the 16parameter algorithm for the orbit fitting accuracy in the same fitting interval, and the 18parameter algorithm is better than the 16parameter algorithm for the 2hour orbit extrapolation. According to the current GPS broadcast ephemeris update strategy, the 4hour orbit fitting by the 16parameter algorithm could have the accuracy by 14cm, while the 3hour orbit fitting by the 18parameter algorithm could have the accuracy by 1cm.
2013 Vol. 33 (1): 53-58 [
Abstract
] (
1538
)
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59
RESEARCH ON SHORT-TERM PREDICTION OF SATELLITE CLOCK ERRORS BASED ON IMPROVED GREY ARMA MODEL
Li Xiaoyu;Yang Yang;Hu Xiaofen; and Jia Ruixi
As one of the key factors for realizing real time precise point positioning, the precision of clock errors prediction has direct effect on the capability of navigation system. Through considering that the clock errors are composed of trend item and random item, a integrated model is proposed, which combines improved Grey with ARMA model. Using the improved Grey model to establish trend item model at first, and then we extract the random item to build the ARMA model, add them to the predicted results at last. The simulation results verify the feasibility and validity of this integrated method through an example using the precise clock errors from IGS(International GPS Service).
2013 Vol. 33 (1): 59-63 [
Abstract
] (
1571
)
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64
COMPARISON AMONG FAST FOURIER TRANSFORM ALGORITHMSFOR DOWNWARD CONTINUATION OF AIRBORNE GRAVITY DATA
Zhou Boyang;Luo Zhicai;Xu Chuang; and Wu Yihao
Downward continuation is one of the major parts in the postprocessing of airborne gravity data. The formulae of inverse Possion integral, iteration method and analytical continuation by FFT are introduced briefly, then observations of gravity disturbance at flight level which are simulated with gravity potential model EGM2008 are downward continued to geoid level with these mentioned methods. A conclusion is drawn that inverse Possion integral can obtain the best results when terrain effect is neglected.
2013 Vol. 33 (1): 64-68 [
Abstract
] (
1314
)
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69
REGIONAL IONOSPHERIC MODELING AND ITS APPLICATION IN SINGLE POINT POSITIONING ANALYSIS
Zhang Rui;Yao Yibin; and Zheng Yanli
We extracted ionospheric delay from the combination observations, built the regional ionospheric model and then tested the WHU products by processing single point positioning for rover stations data. The validation of a provincial CORS (Continuously Operating Reference Stations) network confirms that the singlefrequency SPP of WHU product results present significantly better than CODE product and dualfrequency SPP, at the same time, singlefrequency PPP accuracy increases by about 10%×30% in three directions compared with CODE product, can reach up to about 11.5dm in the north and east direction, and 22.5 dm in the up direction. Finally, we processed dualfrequency PPP with WHU ionospheric product, the experimental results show that the precision ionospheric products play a significant role to improve the initial positioning accuracy, and accelerate dualfrequency PPP convergence and interrupt reconvergence.
2013 Vol. 33 (1): 69-73 [
Abstract
] (
1347
)
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74
AN IMPROVED ALGORITHM OF PARAMETER ESTIMATION AND ACCURACY ASSESSMENT OF LARGE-SCALE NORMAL EQUATIONS
Chen Qiujie;Zhang Xingfu; and Shen Yunzhong;
A largescale normal equation is often demanded in modern geodetic data processing, whereas the traditional algorithm performs very slowly in parameter estimation and accuracy assessment. This paper presents an improved algorithm of largescale normal equations by using Cholesky decomposition and the OpenMP parallel library. The simulation experiments show that the improved algorithm can obtain the same results as the traditional algorithm do,but have a better performance in parameter estimation and accuracy assessment compared with traditional algorithm, and the OpenMP parallel library is more suitable for solving largescale normal equations.
2013 Vol. 33 (1): 74-77 [
Abstract
] (
1547
)
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2960
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78
ANALYSIS OF GPS SEASONAL SYSTEMATIC ERRORBASED ON COLLOCATION SITES
Tian Liang;Duan Jinmei;Wang Qiang;ZhaoYaping;and QiaoYaming
This paper makes comparison among seasonal nonlinear variations of site coordinates of GPS,SLR and VLBI with the collocation site’s coordinate vertical residuals. There is some comparability with those seasonal movements calculated by three space technologies. But the amplitude of vibration is different. The amplitude of vibration calculated
with SLR is nearly the same with VLBI, but different with GPS, the maximum difference is about 7mm. And the errors may be related to the GPS seasonal systematic error.
2013 Vol. 33 (1): 78-80 [
Abstract
] (
1304
)
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2487
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81
ANALYSIS OF AVAILABILITY OF DOP TO FORECAST GNSS RELATIVE POSITIONING
Cao Xinyun;Wang Jian; and Liu Chao
On the basis of principles of GNSS pseudorange single point positioning and relative positioning,the formulas of absolute positioning factor of precision DOP and relative positioning factor of precision RDOP were deduced. This paper also analyzes the relation between two factor of positioning and their variation law and give the applicability scope for using DOP to forecast the GNSS relative positioning. The result indicates that DOP and RDOP have similar variation trend, but not agreed in some part. With the increasing of the number of the observed noncommonview satellites and the asymmetry of geometric strength of satellite， the deviation of using DOP to forecast relative positioning would increase correspondingly. In this case, we had better choose PDOP to conduct relative positioning prediction.
2013 Vol. 33 (1): 81-85 [
Abstract
] (
1544
)
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2333
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86
RESEARCH ON THREE KINDS OF CARRIER FREQUENCY COMBINATION VALUE OF GLONASS
Xu Jun;Tao Tingye;and Gao Fei
The third carrier will be provided by modernized GLONASS satellites frequency program. With the GLONASS carrier phase observation model as a prerequisite, three frequency carrier phase combination of GLONASS method was researched.
The effects of ionospheric delay and observation noise on the observations combined from three frequency were analyzed. According to long wavelength standard, weak ionospheric delay standards, weak observation noise standards, some useful linear combination was put forward to improve the positioning accuracy and speed.
2013 Vol. 33 (1): 86-89 [
Abstract
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1405
)
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2703
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90
PLANE FITTING OF POINT CLOUD FROM 3D LASER SCANNING BASED ON COOK DISTANCE
Yan Jianfeng;and Deng Kazhong;
Traditional leastsquares can not ensure high accuracy and stability for plane fitting when many outliers and error are mixed in original data. To solve this problem, a leastsquares method based on Cook distance is proposed. The method determines strong impact points by Cook distance value from point cloud data optimally and then accurately fitted plane can be achieved by leastsquares. The result of experiment and analysis shows that the fitted plane is closer to the real plane. The method can improve accuracy and stability of the process of point cloud reducing and model building effectively.
2013 Vol. 33 (1): 90-92 [
Abstract
] (
1305
)
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(686 KB) (
2511
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93
DESIGN OF MULTI/WIDE BANDS RECEIVER WITH PRIORI SPECTRUM INFORMATION
Zhang Peng;Xu Zhengguang ;Zou Jingui;and Sun Fuyu
As a compressivesensingbased receiver platform, random demodulator can sample and reconstruct multi/wide bands signals meeting the requirement of sparse spectrum
with low sampling rate. This research simplifies this reconstruction algorithm utilizing the priori spectrum information. We propose a novel reconstruction algorithm: inverse matrix, which not only simplifies the calculation but also enhances the performance of signal reconstruction.
2013 Vol. 33 (1): 93-97 [
Abstract
] (
1327
)
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(1206 KB) (
2340
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98
ACCURACY ASSESSMENT OF CONVERSION BETWEEN REFERENCE ELLIPSOID CENTRIC COORDINATE AND GEOCENTRIC COORDINATE IN REGIONAL SCALE
Yang Xiaowei;Wang Yuhong;and Wu Zhihuan
A software was programmod,which can transform the result between the reference ellipsoid centric coordinate system and the geocentric coordinate system with seven parameter BURSA model. By using this model, the accuracy of the coordinate conversion is assessed and emphatically analyses the accuracy of conversion, the adoptability and the error distribution of the model are analyzed.
2013 Vol. 33 (1): 98-102 [
Abstract
] (
1520
)
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2575
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103
METHODS FOR FITTING LOCAL QUASIGEOID AND THEIR APPLICABILITY ANALYSIS
Guo Chunxi;Nie Jianliang;Wang Bin;and Jiang Guangwei
The character and applicability several fitting methods for refining local quasigeoid are systematically analyzed
in some examples which have the different area, the terrain complexity, the diverse accuracy of GPS/leveling data and the various resolutions of gravity quasigeoid. Finally,those methods are applied successfully in three typical projects of refining quasigeoid, and the good effects are obtained.
2013 Vol. 33 (1): 103-107 [
Abstract
] (
1356
)
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2558
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108
REFINING PRIOR FILTERING MODEL OF GNSS/INS INTEGRATED NAVIGATION BASED ON TIME-FREQUENCY ANALYSIS
Gan Yu ;Sui Lifen ;Zhang Qinghua ;and Sang Bo
Exact prior information is of great importance to both classical Kalman filtering and adaptive filtering. In applications concerned with Kalman filtering, prior model is generally determined arbitrarily and experientially, lacking methodology. Taking the GNSS/INS integrated navigation as an example,the stochastic character of errors, which is subsequently transformed into proper prior information, is obtained from inertial data based on timefrequency analysis. This method avoids the complicated tuning in utilizing Kalman filtering.
2013 Vol. 33 (1): 108-112 [
Abstract
] (
1544
)
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(1025 KB) (
2383
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113
ANALYSIS OF LONG-TERM STABILITY OF REFERENCE STATIONS IN GPS DEFORMATION MONITORING SYSTEM
Liu Hongfei ;Xiao Yugang ;Deng Liansheng ;and Bi Gang
This paper analyzes the longterm stability of two reference stations in GPS deformation monitoring system. The combined adjustment of deformational monitoring network with the Shanxi CORS network is carried out in ITRF2005 consistent coordinates and by using data for one year.and velocities of each point are obtained.Comparison was made between the estimated secular movement rates of reference stations in our calculation and results from stations in the North China region of CMONC (the Crustal Movement Observation Network of China) in 150km range together with grid mean value from velocity filed of Mainland China,it indicats that no obvious nontectonic trends are found at both reference stations. This paper also analyzes short baseline series between the two reference stations. It is shown that linear movement and annual movement exist in N component with rate and amplitude to be 1mm/a and 0.5-1 mm respectivel. Such signals are not obvious in E and U components. Meanwhile, variations were found in all three components with amplitudes of 0.1-0.5 mm.
2013 Vol. 33 (1): 113-116 [
Abstract
] (
1410
)
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117
ANALYSIS OF EFFECTS ON LOCATION ACCURACY OF SENSORS IN NARROW SPACE
Hou Quanwu;Wang Jian ;Hu Hong;and Zhang Hong
According to the coverage characteristics of sensors network in indoor and underground location technology, a scheme of threedimensional (3D) complete coverage was proposed for the location in the narrow space in a tunnel. Besides,the Time Difference of Arrival (TDOA) location technology was employed, meanwhile, the Dilution of Precision (DOP) was selected as the accuracy evaluation index. Thereafter, the changing law of DOP values and positioning accuracy was analyzed while sensors’ spacing increased or decreased. The research shows that positioning accuracy primarily depends on sensor’s radius, width of narrow space, and sensors’ spacing, etc. A simulated insitu test of linear tunnel was carried out, and the result shows that optimization scheme of sensors’ location based on the changing law of DOP can thus dramatically improve the positioning accuracy and reliability.
2013 Vol. 33 (1): 117-122 [
Abstract
] (
1312
)
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123
ANALYSIS OF THERE ALGORITHMS OF ATTITUDEDETERMINATION BASED ON TWO BASELINES
Liu Xiaohui;Dang Yamin;Wang Qianxin; and Yang Lei
This paper introduces the concept of attitude determination, the method for attitude expression and means of attitude determination, and then attitude determination algorithms based on two baselines are presented. In order to investigate the calculating quality with the three algorithms in different conditions, the simulation data is divided into eight cases on the basis of ratio precision of the two baselines. Through the analysis of the computation accuracy of the attitude angles, the cost function and the computation time with the three algorithms in different cases, we found out that the computation results with the optimized TRIAD algorithm and the QUEST algorithm are exactly the same, the cost function decreases with the reduction of precision ratio of the two baselines, the precision of attitude angle is inconsistent with the variation of the cost function, the computation time with TRIAD algorithm is less than those with the other two algorithms.
2013 Vol. 33 (1): 123-127 [
Abstract
] (
1362
)
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(1635 KB) (
2312
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128
IMPROVED STANDARDIZATION METHOD BASED ON CONCAVE-CONVEX FEATURES OF GPS ORBITS
Zhao Ziqiang;and Liu Zhiping
Through analyzing and investigating the concaveconvex features of dynamic GPS orbits, the improved standardization method based on Chebyshev polynomial fitting is presented. The novel method effectively improves fitting interval division, optimal order determination and weighted fitting coefficients calculation. Finally, a case is studied from precise orbits of 32 GPS satellites using existing methods and the novel method respectively and results show that the presented method is superior to the traditional methods in efficiency and accuracy.
2013 Vol. 33 (1): 128-132 [
Abstract
] (
1438
)
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(1089 KB) (
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133
PRELIMINARY STUDY ON MONITORING URBAN SURFACE DEFORMATION WITH SBAS
Yu Yong;Bian Zhengfu;Liu Zhenguo;and Lei Shaogang
The application of conventional differential SAR interferometry (DInSAR) is limited because of temporal and spatial decorrelation. Although the permanent scatterers (PS) method could deal with the problem of decorrelation and phase delay, it must be based on a Darge number of SAR images (generally more than 25). However, the small baseline subsets (SBAS) method has the advantage. So, in this paper, 8 of SAR data acquired from January 2008 to August 2010 by the ENVISAT satellite are taken as the test data and then, the deformation of Taiyuan city is obtained with the SBAS method, and the maximum deformation rates of three sites:Wanbolin, Wujiabao and Xiaodian are -27.11 mm/a, -55.92 mm/a and -67.61 mm/a respectively. The results of deformation rate and timeseries deformation maps are consistent with the previous results,thus it has verified that the SBAS method is feasible to monitor surface deformation.
2013 Vol. 33 (1): 133-136 [
Abstract
] (
1561
)
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(1445 KB) (
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137
PWV INVERSION BASED ON CNES REAL-TIMEORBITS AND CLOCKS
Wang Min;Chai Hongzhou;Xie Kai; and Chen Yanli
The accuracy of PWV results derived from IGS predicted ultrarapid product is limited by its quality, PWV values are estimated with precise point positioning method with CNES realtime orbits and clocks. The inversion results are compared separately with PWV values released by SuomiNet and those estimated from IGS final product. The analysis demonstrates a good agreement between those PWV results derived from different data. The errors of CNES realtime orbits and clocks could influence PWV results in millimeter level.
2013 Vol. 33 (1): 137-140 [
Abstract
] (
1606
)
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2621
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141
RESEARCH ON HIGH PERFORMANCE GNSS NORMAL EQUATION PROCESSING METHOD BASED ON OPENMP
Yang Kai
The whole network data processing of LargeScale GNSS reference station network can avoid the technical problems such as subnetwork division and common station selection of the subnetwork processing strategy. The number of stations whose observation data to be processed should be less than 100. The least square adjustment and SRIF are compared with each other, and then we point out that the least square adjustment is better than the later for large data processing. Further, the high performance computing methods for normal equation are researched; the existing normal equation computing methods are compared with each other, and it is pointed out that the Cholesky matrix decomposition method is better in computing efficiency. At last, the parallel Cholesky matrix decomposition method based on OPENMP is achieved, which can take full advantage of multicore/thread processor to improve the computing efficiency in personal computer platform.
2013 Vol. 33 (1): 141-144 [
Abstract
] (
1563
)
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145
APPLICATION OF POINT MASS MODEL AND LEAST SQUARECOLLOCATION IN MULTI-SOURCE GRAVITY DATA FUSION
Gao Xinbing;;Li Shanshan;Li Hai;Zhang Hongwei;and Wang Yingjian
For the multisource gravity data, the fusion methods such as Least Square Collocation (LSC) and point mass assumption are studied and then tested within a certain region in Australia with both airborne and ground gravity measurement data. The results show that the accuracy of multiresolution LSC proposed is ±36×10
-5
m/s
2
, while that of the least square total collocation is ±8.4×10
-5
m/s
2
.The accuracy of four layers point mass model including airborne dada is ±4.6×10
-5
m/s
2
, while that of the three layers point mass model with ground data only is ±5.6×10
-5
m/s
2
. And the illposed problem in LSC vanishes in the point mass model.
2013 Vol. 33 (1): 145-149 [
Abstract
] (
1290
)
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(1405 KB) (
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150
RESEARCH ON REFINEMENT OF REGIONAL QUASI-GEOID OF POYANG LAKE
Peng Xiangguo;Wan Xianbin;and Wang Hailong
This paper proposes the BP neural network method which is based on particle swarm optimization algorithm to refine the regional quasigeoid, it by selecting the neural network weights and thresholds reasonably can effectively avoid the defect that the network slow convergence and easily trapped into the local optimal. This method is verified through the data of Poyang Lake and the results show that PSOBP neural network model can still obtain a good effect in the compared with the two surface partition fitting method
absence of considering terrain conditions, which is selected according to the height anomaly variation.
2013 Vol. 33 (1): 150-152 [
Abstract
] (
1477
)
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2346
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观测技术
153
RESEARCH ON IN-SITU CALIBRATION TECHNIQUE OF RZB BOREHOLE STRAINMETERS
Ouyang Zuxi
Two previous generations of RZB borehole strainmeters carry the measurement based on the transformer bridge consisting of the ratio arms and two differential capacitences of the transducer. The insitu calibration of the strainmeter was achieved by manual electric calibration methord. Because being unable to realize insitu calibration without the ratio arms the third generation of RZB borehole strainmeters using digital capacitance displacement transducers is unqualified for the technical requirements of instruments in network for earthquake monitoring. For these digital capacitance displacement transducers the research on new micro displacement calibration technique choosing REMA Magnetostrictive Alloys is carried through recently, the configuration and primary experimental results of new regulator are introduced and causes resulting in calibration error are also discussed.
2013 Vol. 33 (1): 153-156 [
Abstract
] (
1571
)
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157
STUDY ON RELATIONSHIP BETWEEN COMPACTION DEGREE AND DYNAMIC ELASTIC MODULUS OF SILTY SOIL
Luo Denggui;and Lin Song;
This paper tries to use the effective vertical and horizontal velocity to obtain the dynamic elastic modulus,and then we can use the dynamic elastic modulus to measure the soft subgrade compactedness.
2013 Vol. 33 (1): 157-159 [
Abstract
] (
1169
)
PDF
(617 KB) (
2419
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