大地测量与地球动力学
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Current Issue
2010 Vol.30 Issue.6
Published 2011-01-30
地壳形变与地震
1
ANALYSIS OF MOVEMENT CHARACTERS OF PRESENT-DAY ACTIVE TECTONICS OF NORTHERN TIANSHAN REGION
Li Jie;Wang Xiaoqiang ;Tan Kai;Liu Daiqing ;Paerhati ;Jiang Jinxiang ;and Fang Wei
Using GPS measurements in the Northern Tienshan Mountains from 1998 to 2008, we obtain the presentday crustal movement velocity field for more than 30 sites, at the same time, estimate active rates on the major faults in the studied region. The GPS velocity results show that
there is nonuniformity for NS direction crustal shortening of northern Tianshan area and it shows the correlation between the differences of the absorption rate and frequency of the earthquake occurring. The active faults movement characters derived from the GPS measurement results are consistent with the geological results, but there are differences in the value.
2010 Vol. 30 (6): 1-5 [
Abstract
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1722
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6
PROCESSING AND ANALYSIS OF FOUR-COMPONENT BOREHOLE STRAIN OBSERVATIONS
Zhang Jing;and Liu Qi
On the basis of the borehole strain observations at Guza and Xiaomiao stations in the National Digital Seismological Observational Networks, the coupling coefficients and phase lag of tidal response are fitted by using solid tidal strain model. With comprehensive observation model which contains tidal response rate and phase lag and effects of air pressure disturbance, the changes within the tidal band are analyzed. The spatial and temporal changes are discussed from characteristics of geological structure and medium. The results show that anomalies of tidal response parameters and high frequency disturbance had been observed from several months to a year before Wenchuan Ms8.0, Huili Ms6.1 and Yaoan Ms6.0 earthquakes. The strain rosette at Guza station is stable relatively, the deformation is mostly dominated by geological structure.
2010 Vol. 30 (6): 6-9 [
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1694
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10
DISCUSS OF FREQUENCY-SPECTRUM CHARACTERISTICS ANDCLASSFIED PROBLEM OF SEISMIC EVENT ON THREE GORGES
Wu Haibo;Yao Yunsheng;and Xue Junrong
A great many of microearthquake activities have been recorded in the neighborhood of Three Gorges after reservoir impounding since 2003. Frequencyspectrum of 36 known seismic events are firstly calculated, and then the characteristics of frequencyspectrum parameters are concluded. After contrasting them with seismic events on the Three Gorges area, the results show that there are comparatively abundant low frequency, and lower dominant frequency, peak frequency and corner frequency by comparing them with tectonic earthquakes.
According to the characteristics of these frequencyspectrum, 29 seismic events on the Three Gorges area are classified to four types: tectonic, surface tectonic, event between tectonic and collapse, and collapse.
2010 Vol. 30 (6): 10-15 [
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1696
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16
ANALYSIS OF ANOMALY OF GROUND TITL AT LONGYAN SEISMOSTATION BEFORE TWO MEDIUM-STRONG EARTHQUAKES IN LONGYAN AREA
Liu Qishou;Wang Shaoran;Yang Peiqin;Zheng Jianzhi;Li Yuanxing;Lai Fulin;and Zheng Yongtong
The observations of the horizonal penbulum tiltmeter at Longyqn seismostation from 1989 to 1998 are arranged systematically, and then,the data are processed by using a variety of mathematical methods,and their result curves are drawn out and analyzed with software EIS2000.It can be seen that there were anomalous variation of the ground tilt value at the Longyan station before the two above Ms4.5 earthquakes in Longyan area.
2010 Vol. 30 (6): 16-19 [
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1767
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20
MONITORING GROUND FISSURES IN XI’AN AREA BY USE OF CR-InSAR
Zhu Wu ;Zhang Qin;Zhao Chaoying;Yang Chengsheng ;and Wang Hongyu
Taking the ground fissures in Xi’an are as example, the ground fissures deformation is studied by use of CRInSAR.Using LAMBDA unwrapping method, the time series of ground deformation information of f
3
and f
11
fissures are obtained from 2009 to 2010.Comparing with other results, the CRInSAR data are consistent with leveling results, so it is proved that CR-InSAR is reliable for monitoring the ground fissures.
2010 Vol. 30 (6): 20-23 [
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1732
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24
FRACTAL CHARACTERISTIC ANALYSIS FOR REMOTE SENSING IMAGES BEFORE AND AFTER EARTHQUAKE
Chen Wenkai;He Shaolin ;Zhou Zhonghong ;and Zhang Suping
The triangular prism surface area method was used to analyze fractal dimension of the different ground objects in remote sensing images obtained from Wenchuan Ms8.0 earthquake. The experimental results show that fractal dimensions values in same region of optical image are different, image quality has great influence on fractal dimension and that fractal feature is able to be used for distinguishing the different degree of building damage, rolling stones and others.
2010 Vol. 30 (6): 24-30 [
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1847
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31
IMPROVED PARTICLE SWARM OPTIMIZATION ALGORITHM AND ITSAPPLICATION IN INVERSION OF SLIP VELOCITY OF FAULT
Duan Hurong;Zhang Yongzhi ;and Xu Haijun
According to the dislocation model and from the
simulated observation values of horizontal displacement
the threedimensional slip rate of the fault was deduced with the PSO algorithm, the genetic algorithm and Montecarlo algorithm respectively.The results show that the consuming time with three algorithms rises in accord with the increase of the inversion parameters range and the fitness value, but the PSO is better than the other two algorithms.At the same time the PSO and the improved PSO algorithm were compared. The results of comparison indicate that consuming time with the improved PSO is decreased by 26.50% when the fitness value is 0.95.
As an example,the threedimensional slip rate of faults was calculated in the middle and eastern segments of Qilianshan fault with PSO algorithm and improved one and the results show that the consuming time with improved PSO is decreased by 36.34% and it is verified that the factor of dynamic adjustment of the inertia weight is more prominent than the factor of mutation operation.Futhermore in the middle and eastern segments of Qilianshan fault the main movement
is leftlateral strikeslip with normal dipslip.
2010 Vol. 30 (6): 31-36 [
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1640
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37
APPLICATION OF BAYES ESTIMATION BASED ON ROBUST CYCLIC SEARCHING IN CRUSTAL DEFORMATION ANALYSIS
Zhao Lihua ;Zhang Qin ;and Wang Qingliang
When combining geophysical information with geodetic observation for crustal deformation analysis there may be unreliable parameters.The Bayes estimation based on robust cyclic searching is proposed,in which the deformation predicted by geophysical model as priori information in geodetic (GPS) measurements processing is used and the cyclic searching is adopted to modify improper priori information. Taking into account the abnormal observation station moving or outliers in measurements may influences the searching results, we calculate searching functions from selected stable stations by robust cyclic searching. The new method is applied in a GPS monitoring net. It is shown that the robust cyclic searching is effective in modifying priori information and improving the accuracy of model parameter.
2010 Vol. 30 (6): 37-41 [
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2129
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理论方法研究
42
ANALYSIS OF HEIGHT ANOMALIES RESULTED FROM INNER AND OUTER DISTURBING MATTERS OF THE EARTH
Zhang Chijun ;Luo Mingjin ;Wang Xinsheng;and Fang Jian
There are many plateaus with negative heigth anomalies (geoid undulation) around the world, they are really positive or negative? It needs to be proved theoretically. We have derived the positive and negative discriminant of the elevation anomalies, which result form
disturbing matters inner and outer of the earth. The conclusion is also proved from model calculation. Moreover, the effects of terrain in heigth anomalies calculation are expatiated.
2010 Vol. 30 (6): 42-46 [
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1852
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47
SOLUTION OF SEMIPARAMETRIC MODEL WITH DERAILIZED LEAST SQUARE AND STATISTIC CHARACTERISTICS OF ESTIMATOR
Ding Shijun;and Jiang Weiping
The semiparametric model is a combination of classical linear model and nonparametric regression model.
The two didfferent computing methods on the resolution of the semiparametric model under the principle of penalized least squares are discussed and the computation formulas of the resolutions and estimate accuracy are detailed.On the basis of the statistic characteristics of random error，the statistic characteristics of the semiparametric model estimators are discussed about mathematical expection,variances of estimates and mean square error of the parameter estimate.Finally, a simulated example is demonstrated and some conclusions are drawn.
2010 Vol. 30 (6): 47-50 [
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1902
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51
REGULARIZATION HOMOTOPY METHOD FORSOLVING ILL-POSED NONLINEAR LEAST SQUARE PROBLEM AND ITS APPLICATION
Tang Limin;and Zhu Jianjun
A regularization homotopy function is constructed for solving the illposed nonlinear least squares problem whose Jacobian matrix is rankdeficient or very illconditioned. A regularization homotopy iterative formula is established for illposed nonlinear least squares problem. The iterative process is derived in detial and the continuity and convergence conditions are given as well. Two new regularization parameter selecting strategies are proposed, which called as direct search method and interval division method. The calculation results of nonlinear least squares problems show that the method is correctly and applicable. Calculation results of nonlinear adjustment of free networks with rank deficiency examples also show that the method not only decrease the iterative matrix condition number, but also make the condition number small fluctuation in the total iterative process, so that a smaller stable norm solution can be obtained.
2010 Vol. 30 (6): 51-56 [
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1796
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57
A NEW VARIANCE COMPONENT ESTIMATION METHOD USED FOR COLLOCATION
Li Weiwei ; and Shen Yunzhong;
For the collocation model, the quasiobservation equation usually is introduced to signals, and then the variance components for both observation errors and signals estimates are computed by use of the Helmert equation. A new formula to estimate the variance components for collocation model is derived based on the quadratic forms of residuals and signals. The numerical example indicates that the new method can get the same results as that based on quasiobservation equation, thus the method is proved to be true.
2010 Vol. 30 (6): 57-59 [
Abstract
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1968
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60
STUDY ON GRIDDING METHODS OF SATELLITE GRAVITY GRADIENT DATA
Liu Xiaogang ;Wu Xiaoping ;Wang Baojun;and Pang Zhenxing
Four gridding methods: the moving average method, the inverse distance weighting method, the weighted moving trend surface method and the ordinary Kriging method, which are in common use to deal with the scattered data, are introduced. The gridding effects of the four methods are analyzed and compared with each other by using simulated satellite gravity gradient data.The results show that there should be enough information to be included to reflect the spatial distribution characteristics of the original data and the requirement of computational velocity in the choice of the searching radius; the influence of the distance between the known points and the computational points must be considered in the gridding of the scattered data.It is shown that the inverse distance weighting method is suitable for gridding the scattered satellite gravity gradient data in view of the accuracy of the gridding results, the computational velocity and the approaching effect to the original data.
2010 Vol. 30 (6): 60-65 [
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1891
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66
ERROR EFFECT ANALYSIS OF KINEMATIC PRECISE ORBIT DETERMINATION FROM SATELLITE-BORNE GPS UN-DIFFERENTIAL PHASE OBSERVATIONS
Zheng Zuoya;Dang Yamin;Lu Xiushan;and Yang Fanlin;
In the undifferential phase kinematic precise orbit determination from satelliteborne GPS data, besides ionospheric delay, multipath effect, relativistic effect and phase center offset, LEO satellite orbit accuracy is prone to be affected by GPS precise ephemeris from different data centers, spatial geometric distribution of GPS satellite and so on. Taking satelliteborne GPS observations on CHAMP satellite as example, we analyze error effect on kinematic precise orbit determination from GPS precise ephemeris, satellite clock bias, phase center offset, relativistic effect and GPS satellite geometric distribution, and achive some helpful results,the main ones are as follows.1)The difference among the GPS orbits obtained from different data processing centers are small.2)The clock error changes between neighboring epochs of the some data centers are small,1-2 cm and the differences of the correction clock error of different data center are large.3)The accuracy of the clock error correction of GPS satellite is better than 5 ns.
2010 Vol. 30 (6): 66-70 [
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1987
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71
AN IMPROVED SATELLITE CLOCK BIAS DETERMINATION METHOD OF HIGH SAMPLING RATE
Yi Zhonghai ;Zhu Jianjun ;Chen Yongqi ;and Dai Wujiao
As there are several shortcomings in current clock bias determination methods, an improved high sampling rate satellite clock bias determination method is proposed.At first, satelliteepoch differenced satellite clock bias is estimated station by station using undifferenced ionofree phase observations from a GPS network, IGS precise ephemeris and lowrate satellite clock bias product and then averaged. After completing satelliteepoch differenced satellite clock bias calculation, satellite differenced clock bias at each epoch is derived using summation method. Finally,satellite clock bias at each epoch is determined. During satellite clock bias determination, reference satellite change problem should be considered, precise troposphere zenith delay value is used to correct troposphere delay and other errors, e.g. phase windup, solid earth tide are also corrected. Theory analysis and experiment results show that the improved method has several advantages, such as less unknown parameters, simple algorithm, high computation efficiency and high accuracy, and could be used in highrate satellite clock bias determination.
2010 Vol. 30 (6): 71-76 [
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2408
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77
PHASE UNWRAPPING WITH HYBRID PARTICLE SWARM OPTIMIZATION ALGORITHM
Fan Hongdong;Deng Kazhong ;Xue Jiqun;and Zhu Chuanguang;
Aiming at the disadvantages of phase unwrapping methods for the Goldstein branch cutting and ant colony optimization, a new phase unwrapping algorithm with hybrid particle swarm optimization algorithm (HPSO) is proposed. At first, the residues were divided into dipoles, border points and inner points by preprocessing, and then, the inner points were separated in several areas, where the shortest paths were generated by the HPSO, finally, the shortest paths were segmented into some small branch cuts with the balance charges, and the border points and the disconnected residues were connected with window expanding method. The experimental results show that the algorithm proposed is much better than the classical phase unwrapping method of Goldstein branch cut.
2010 Vol. 30 (6): 77-81 [
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1646
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3710
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82
GPS HEIGHT TRANSFORMATION BASED ON MOVING SURFACE FITTING
Ding Haiyong ;Yang Yanzhen ;Wang Xinzhi ;and Wang Xiaoying
To improve the accuracy of GPS height transformation from geodetic height to normal height, the moving surface fitting algorithm is presented to fit every subregion. The point whose normal height is unknown is selected as the circle center. Given the original value of the region semidiameter, a conicoid is fitted by use of the known points in the region. For the illposed equations appeared during the surface fitting, ridge estimation algorithm is used to improve the accuracy of parameter estimation. Some numerical experiments show the feasibility and higher accuracy of moving surface fitting algorithm by compared with other methods
2010 Vol. 30 (6): 82-85 [
Abstract
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1742
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2500
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86
REAL-TIME PRECISE NORMAL HEIGHT SURVEYINGBASED ON VRS SYSTEM
Li Jiangwei;Liu Jingnan ;Xiao Jianhua ;and Bai Jie
An appropriate strategies for realtime precise normal height positioning is proposed.The testing results show that the approach can improve the accuracy of realtime normal height to about 3 cm and can evidently increase the users’ working efficiency.
2010 Vol. 30 (6): 86-90 [
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1688
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3128
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91
GPS HEIGHT CONVERSION BASED ON COMBINATION METHODSOF SURFACE FITTING AND BP NEURAL NETWORK
Hou Dongyang ;and Zhang Shubi;
In the GPS height conversion, it is unable to obtain high accuracy only using surface fitting method and there exist great risk by using BP neural network. To solve the problems, six kinds of combination methods based on the surface fitting and neural network are designed.These methods are compared and analyzed through one example. The results show that the accuracy of the six combination methods are higher than by use of single surface fitting method or BP neural network method, especially the threeinput surface fitting method has highest accuracy.
2010 Vol. 30 (6): 91-94 [
Abstract
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1826
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3138
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95
LINE-MASS HARMONIC ANALYSIS METHOD BASED ON SATELLITE GRAVITY GRADIENT DATA
Wu Xing;Zhang Chuanding ;Wang Kai ;and Feng Wei
Targeting at the new type data called gravity gradient, the basic formulae and equations of the global line mass model and harmonic analysis are derived. The line mass models based on radius real component, horizontal complex component and full tensor are studied,so are the least squares solutions. The harmonic analysis formulae of line mass models are shown completely, which have various advantages such as eliminating the disperse errors and dealing with multitypes data compared with point mass harmonic analysis.
The line mass method is better than the point mass method as the former is with consideration of different depths and with various frequencies. Finally, the availability and validity are proved through simulation experiments.
2010 Vol. 30 (6): 95-99 [
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1732
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100
A GPS PRECISE CLOCK ERRORS PREDICTION MODEL BASED ON WAVELET AND ARMA
Zhang Qinghua;Sui Lifen;and Mu Zhongkai
The quadratic polynomial model and grey model used in short and long period clock errors predictions are analyzed, considering that these models only think about trend item but not random item. An improved method is given,which combines wavelet and ARMA. The computation results show that through an example by using the precise clock errors from IGS (International GPS Service) the improved model has higher accuracy.
2010 Vol. 30 (6): 100-104 [
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1786
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105
RESULTS OF VTEC INFLUENCED BY DIFFERENT WEIGHTING METHODS
Ye Xiaozhou ;Chen Peng ;and Wu Han
The ionosphere delay is an important source of error in GPS measurements. TEC can be calculated by using dual-frequency GPS observations, and then highprecision region Ionosphere Model can be established. The quality of GPS observations and satellite elevation angle are closely related and different data processing methods have some influence on the results. Two different weighting methods are used and their results are analyzed .It shows that using a high elevation angle for weighting will get more accurate results.
2010 Vol. 30 (6): 105-107 [
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1650
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108
RESEARCH OF ALGORITHM FOR GENERATING-NETWORKOF CORS FIDUCIAL STATION BASED ON DTIN
Guo Ying;Cheng Pengfei ;and Lü Hongbiao
Seeing the application situation of Continuously Operating Reference Station Service System (CORS), its development prospect is analyzed. The projection function of plane, sphere and ellipsoid and the projection coordinates of points expressions are given with the existing Delaunay triangulation network configuration algorithm. Meanwhile, the construction process of CORS reference station network is summed up. With respect to some specific subsets of fiducial stations which are with many points in a same circle, the best structure of corresponding web method is studied. According to the demand of adjacent CORS network for linking, deleting, and adding fiducial stations (network), a new local network update algorithm is also presented and feasibility and effectiveness of the algorithm is proved.
2010 Vol. 30 (6): 108-111 [
Abstract
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1735
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2214
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112
ANALYSIS OF INFLUENCE OF SAMPLING INTERVAL AND VTECMODEL ON ESTIMATION OF GPS INSTRUMENTAL BIASES
Gao Shuzhao;and Huang Dingfa
In the calculation of ionosphere distribution, it is a key to eliminate the instrumental biases of satellite and receiver from
GPS dualfrequency observations. The effects of changing sampling interval and VTEC fitting model were analyzed. The calculation results indicate that the 3hour sampling interval and cubic fitting model are sufficient for computing the instrumental biases on continuous GPS stations. \
2010 Vol. 30 (6): 112-115 [
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1779
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116
APPLICATION OF INTEGER PROGRAMMING FOR DETERMINING TRIPLEFREQUENCY OBSERVATIONS
Chen Yu;Bai Zhengdong;and Yuan Bo
With the wide application of the multifrequency of GNSS, Triplefrequency phase can form a lot of longwavelength, weak ionospheric delay and lownoise linear combinations. These features can effectively make the value of ambiguity to be quickly identified and the impact of ionospheric delay to be weakened. As the ambiguity of combination observation is necessary to be an integer, every combination coefficient so as to be an integer. The integer programming algorithm is presented, adopting the wavelength of combination observation as the objective function and weak ionospheric delay and lownoise of observation as the constraint conditions for the establishment of integer programming mathematical model in order to obtain global optimal integer solution. GPS data analysis shows that integer programming algorithm to determine the triplefrequency combination observation is a valuable algorithm.
2010 Vol. 30 (6): 116-119 [
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1671
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120
ANALYSIS OF TRANSFORMATION OF DATUM CONSISTENCY AND SENSITIVITY IN DEFORMATION MONITORING NETWORKS
Huang Bingjie;Zhou Jian ;Bai Jie ;and Wang Xiang
An appropriate method and flow for data processing and stability analysis of deformation monitoring network with no stable datum is proposed.
So the consistency of graphics and datum of observational data in several periods can be achieved.
Futhermore,the point’s stability of the network can be judged by use of the method of mean gap and we will obtain the deformation model, and analyze the model’s sensitivity.A computational example shows the feasibility and superiority of the method.
2010 Vol. 30 (6): 120-125 [
Abstract
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1685
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126
STUDY ON GREY MARKOV PREDICTION MODEL FOR OLD GOAF RESIDUAL SUBSIDENCE
Wang Zhengshuai;and Deng Kazhong;
On the basis of analyzing the shortcomings of GM(1,1) in predicting fluctuant residual subsidence series of old goaf, a new model for residual subsidence prediction named grey Markov prediction model (GMMarkov) was proposed. In this model, particle swarm optimization (PSO) is used to optimize the parameters of background and initial disturbance values of GM(1,1) so that the trend could be predicted and separated fully from the subsidence series; then, Markov chains is selected to correct the prediction value. The model of GMMarkov was applied to predict the residual subsidence of an old goaf and the prediction values were compared with that of GM(1,1).
Compared with GM(1,1), the result of GMMarkov model show good qualities in terms of prediction accuracy and stability.
2010 Vol. 30 (6): 126-130 [
Abstract
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1709
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(484 KB) (
2714
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131
RESEARCH ON METHOD OF GML INDEXING BASED ON IMPROVED QUAD-TREE
Zhang Xiaodong ;Wang Liang ;Han Liqin ;Lan Xiaoji ;and Wang Zhihong
GML is an international standard, it solves the spatial data sharing problem perfectly. For the existing GML indexing technologies, QuadTree indexing technique has a high efficeency. In order to diminish spatial data redundancy, the traditional indexing method had been amended.Then LINQ and joining spatial operation methods had been used to support GML query operation. The experiment proves that the improved traditional QuadTree has raised the performerce of the GML indexing technique efficientcy.
2010 Vol. 30 (6): 131-134 [
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2144
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3089
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135
A NEW REAL-TIME KINEMATIC PRECISE POINT POSITIONING ALGORITHM BASED ON REFERENCE-STATION CORRECTIONS
Huang Guanwen ;Tu Rui ;Zhang Qin ;Wang Li ;Li Yuehua ;and Lin Yuting
Traditional kinematic Precise Point Positioning (PPP) technology is affected easily by dynamic noise and complex observation errors, and also has a low instability of accuracy. A new realtime kinematic precise point positioning algorithm based on referencestation corrections is proposed to solve these problems. The algorithm can effectively resolve same observation errors between reference station and mobile station, and then modify accuracy of observations at mobile station. New algorithm is still using traditional PPP ionosphere-free combination observation model, and its processing steps are also consistent with common kinematics PPP software. The simulation results prove that new algorithm can obtain equivalent results with kinematic relative positioning.
2010 Vol. 30 (6): 135-139 [
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1793
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140
STUDY ON THE VARIFICATION METHOD OF SOLAR ECLIPSE SOLAR BASED ON GAMIT
He Lina ;and Wang Jiexian;
Study on the algorithm for getting realtime position of the sun and the moon and drawing their orbits are the main purposes of this paper. On the basis of famous GPS data processing software GAMIT, the theory and method for getting 3D coordinates in the inertial coordinate system is introduced, and the way to transform inertial coordinate system to bodyfix coordinate system is discussed,and the formula for solving solar and lunar apparent place is given. Taking into account of the solar eclipse chronometer phenomena happened on 22/07/2009 in China, data at nineo’clock, thirtynine minutes and eighteen seconds in Shanghai is used to analyze the track of the sun and the moon, and the methods are proved correct.
2010 Vol. 30 (6): 140-143 [
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1625
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144
ON APPLICATION OF UKF IN AUTONOMOUS NAVIGATION BASED ON GEOMAGNETIC FIELD
Wang Xianglei;and Zhao Dongming
Autonomous navigation based on geomagnetic field was studied, the system state equations based on the dynamic equation of satellite orbit were built and the observation equations with geomagnetic field vector as the observable were derived. To solve the nonlinear problem of the system, the UKF method for nonlinear system was introduced into the autonomous navigation system based on geomagnetic field.Finally,the simulations were made for the autonomous navigation system based on geomagnetic field with Matlab, and the effects of filtering period, errors of initial values and measurement errors on the performance of UKF were analyzed. The results show that the UKF has good performance in stability and convergence.
2010 Vol. 30 (6): 144-149 [
Abstract
] (
1947
)
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观测技术
150
A NEW PRECISELY POSITIONING METHOD FOR MICROTREMOR ARRAY POSITIONING
Liao Chengwang;Deng Tao;Ding Wei;Wang Hao;and Wei Wei;
A new method combining GPS and leather ruler is presented and its principle and procedure are introduced and test results are given. It is shown that the positioning accuracy with the new method is at centimeter level that can fully meet the requirements of microtremor array disposition, and the presented method has the characteristics of reliability and easy operation.
2010 Vol. 30 (6): 150-153 [
Abstract
] (
1672
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154
DESIGN OF AUTO-ZERO FOR HIGH-PRECISION TILTMETER
Wu Yanxia;Hu Guoqing ;Ma Wugang;and Tan Yechun
The major incentives of zerodrift of highprecision tiltmeter are analyzed and two kinds of zeroing methods:
remotely zeroing and automatically zero of highprecision tiltmeter are introduced. The two circuits for remotely zeroing and automatically zeroing are applied in vertical pendulum tiltmeter to solve the zeroing problems.So the zeroing accuracy reaches 200mV(the range of the instrument is 2000mV).
2010 Vol. 30 (6): 154-156 [
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] (
1639
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157
ANALYSIS OF OBSERVATIONS OF SUPERCONDUCTING GRAVIMETER SG-053
Liu Ziwei;Li Hui;Hao Hongtao;Wei Jin;and Xing Lelin;
The observations of superconducting gravimeter SG053 at observing station of Gravity Network Center of China
from Feb. to Sept., 2009 are analyzed. The results show that the ambient noise level reaches to 1.146×10
-8
ms
-2
, and the precisions of tidal factors of O1, M2 waves reach to 0.01%, which indicates that the observation by the SG053 can be use as the datum of earthquake continuous gravity observation network for earthquake monitoring.
2010 Vol. 30 (6): 157-160 [
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] (
1727
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3346
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