大地测量与地球动力学
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Current Issue
2010 Vol.30 Issue.第3期
Published 2010-08-13
院士论坛
1
ON PROGRESS IN TECHNOLOGY AND MODERNIZATION OF GPS
Chen Junyong;
The new progress of GNSS, and the three steps of the GPS modernization are introduced,it is to broadcast new civilian navigation codes: L1C, L2C and L5; new military navigation codes: M1 and M2; and launch the 3rd generation GPS satellite GPSⅢ. The development of GPS modernization in the recent two years is introduced as well. The L2C and L5 civilian navigation codes have been broadcast, though they are not decode till now. The space configuration of GPS satellites is in reconstruction, and the number of GPS active satellite will increase to 27 even to 30.
2010 Vol. 30 (第3期): 1-4 [
Abstract
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2070
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地壳形变与地震
5
CHARACTERISTIC ANALYSIS OF COSEISMIC DEFORMATIONOF YUSHU Mw6.9 EARTHQUAKE FROM InSAR IMAGES
Shen Qiang ;Qiao Xuejun ;Wang Qi ;Zhang Jingfa ;Tan Kai ;and Yang Shaomin
The coseismic surface deformation information of Yushu earthquake on April 14,2010 is firstly extracted by using ALOS PALSAR and ENVISAT ASAR based on interferometry technique. Analysis of displacement fields shows that there were surface ruptures three times,at least, the deformation along the fault was much larger than that of the perpendicular, where the effect is in range of 10 km. Maximum displacement reaches 54 cm in line of sight, 180 cm in horizontal deriction. Deformation distributions and characteristics are very consistent with that of sinistral strike slip. The consistency is found between the two results from ALOS PALSAR and ENVISAT ASAR separately. In addition, the location of macroepicenter derived from InSAR very close to that from field investigation. It means that InSAR is a simple and quick means to locate macroepicenter of an earthquake.
2010 Vol. 30 (第3期): 5-9 [
Abstract
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2061
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10
CURRENT TECTONIC MOVEMENT OF SOUTH CHINA SEA AND ITS SURROUNDING AREAS
Li Yanxing ;Zhang Jinghua ;Zhou Wei ;Luan Xiwu ;Hu Xinkang ;and Zhang Zhongfu
We collected and processed the site velocities of South China Sea(SCS) and its surrounding areas and obtained unified velocity field in ITRF2005. By analyzing the spatial variation of the velocity field and strain field, and relative motions between blocks it is discovered that the SCS extends still up to now. The western part of SCS is opening gradually NWSE from its northern margin to south, but the eastern part of SCS is opening gradually from its central part to north and to south. On the basis of computed results of strain field, the average extension rate in about
SN is 3.1 mm/a in the CSB and extension rate in SN is 9.3 mm/a in eastern part of SCS 117°E between 11°N and 22°N which is smaller than the average extension rate of 13.0 mm/a along NNWSSE since 65 Ma. The expansive motion of the SCS is resulted from the common effects between Indian plate, Pacific plate, Philippine Sea plate and Eurasian plates, and the upwelling of the mantle matters of SCS area.
2010 Vol. 30 (第3期): 10-16 [
Abstract
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1922
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17
ANALYSIS OF COSEISMIC TILT AND STRAIN VARIATIONS FOR WENCHUAN Ms8.0 EARTHQUAKE
Zhao Bin;Lu Pinji ;Chen Zhiyao ;Li Zhengyuan ;and Tan Kai
Coseismic tilt and strain offsets for Wenchuan Ms8.0 earthquake had been recorded by almost all of the continuous tilt and strain instruments in China. These offsets can be interpreted as qui-static tectonic changes after the earthquake. We calculate coseismic tit and strain offsets at the stations around about 450 km of the epicenter and coseismic tilt and strain offsets are simulated with halfspace elastic dislocation model, particalarly using finite slip models inversed from farfield broadband seismic waveforms and from nearfield geodetic data (GPS&InSAR). Consequently, comparisons between the observed and modeled offsets for tilt and strainmeters are analyzed. Our preliminary study demonstrates that the directions of observed ~75% tilt offset and ~33.3% strain offset are consistent with that modeled, respectively, and the magnitude of the observed tilt offsets are 1-2 orders larger than that of modeled, whereas the observed strain offsets are coherent with the modeled or 1 orders of magnitude larger than that of modeled.
2010 Vol. 30 (第3期): 17-21 [
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1854
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22
DEFORMATION CHARACTERISTICS OF SOUTHERN SEGMENT OF XIANSHUIHE FAULT BEFORE AND AFTER WENCHUAN Ms8.0 EARTHQUAKE
Fang Ying;Jiang Zaisen;Yang Yonglin;Gu Guohua;and Wu Yanqiang
The GPS observation results showed that an obvious change took place in two southern profiles of Xianshuihe fault after the Wenchuan Ms8.0 earthquake. Movements of sites close to the fault were of from preseismic leftlateral strikeslip to postseismic dextral
strikeslip, from preseismic compression to postseismic tensile.
The impact of the Wenchuan earthquake on profile Shimian is bigger than that on profile Kangding in dextral strikeslip, tensile and scope. The impact of the Wenchuan earthquake wasn’t obvious on sites farther away from the fault. The seismic hazard of southern segment of Xianshuihe fault might declined in a certain extent with the Wenchuan earthquake, because of background of leftlateral strikeslip.
2010 Vol. 30 (第3期): 22-26 [
Abstract
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1832
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27
STATIC AND KINEMATIC ANALYSIS OF COSEISMIC DEFORMATION OF WENCHUAN Ms8.0 EARTHQUAKE
Xu Shaoguang ;Xiong Yongliang ;Liao Hua ;Wu Yaoqiang ;and Lu Yipei
Before and after the Wenchuan \%M\%s8.0 earthquake on 12th May 2008,the coseismic deformation changes greatly,
the horizontal deformation at PIXI, MYAN, ZHJI and CHDU GPS stations reached 70 cm,31 cm,23 cm,20 cm respectively. The most deformations are towards northwest 45°, nearly the orthogonal direction of the fault, and the right region,i.e. Chengdu plain of the fault appears downward. The results of kinematic GPS data processing show that the maximum deformation of PIXI reached about 1 m during the earthquake.
At last, on the basis of the region time recorded at the stations of the Sichuan GPS network,the average S wave velocities from Wenchuan to all the GPS stations of the network are computed.
2010 Vol. 30 (第3期): 27-30 [
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2388
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31
ON METHODS OF CRUST DEFORMATION ANALYSIS OF MEDIUMSMALL AREA BY USING DISPLACEMENT VELOCITY DATA OF GPS STATIONS
Bo Wanju;Hu Xinkang;Dong Yunhong;and Zhang Fengshuang
The displacement velocity data of 28 GPS stations in TianjinBeijing area under the ITRF2005 are further processed and analyzed as a whole. In a local area, it is unavoidable that local crust moves rigidly on the whole relative to ITRF2005, and this disturbs us in interpreting the magnitude and characters of crust relative deformation inside the area. The method for dividing the parallel components of the velocity vectors is studied. Through the analysis
of practical data, it is concluded that with both of parallel component average method and Euler vectors method,
good results can be obtained respectively from the data of 28 GPS stations in Tianjin and Beijing area,
however, the parallel components average method is of more simplicity and clarity.
2010 Vol. 30 (第3期): 31-34 [
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1787
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35
RESEARCH ON DEFORMATION FIELD AND STRAIN FIELD IN WESTERN SICHUAN AREA BY BEM
Jiao Long ;Wu Yun ;and Zhang Yuegang
Takes Bayan Har and Sichuan crustal block as object of study, and takeing GPS displacement on boundary as input data and solves the variation of stress on block boundary,the variation of stress on block bounhdary is solved with Boundary Element Method and the distributions of displacement and strain in the two blocks are calculated and ploted from the stress.It is found out that NS
trending tensile strain decreased quickly from west to east in Bayan Har crustal block before Wenchuan \%M\%s8.0 earthquake, thus made the Longmen mountains fault locked, great strain energy accumulated and the earthquake occured.
2010 Vol. 30 (第3期): 35-38 [
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1830
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39
AUTOMATIC DENOISING ALGORITHM OF EARTHQUAKE SIGNAL BASED ON HHT DECOMPOSITION
Yang Guangliang;Zhu Yuanqing ;and Yu Haiying
According to the HilbertHuang mode decomposition of earthquake signal, combined with STA / LTA algorithm for automatic identification of signal and noise mode,an automatic denoising algorithm of earthquake signal based on the HHT decomposition and STA/LTA algorithm is presented. This method does not require analysis of the spectral characteristics of the signal and could filter the signal with highpass, low pass and bandpass automatically in timedomain. The algorithm was successfully applied in automaticly denoising the Ms2.9,Ms3.8 and Ms3.7 earthquake signal separately occurred in Rudong Sea, Yancheng Coastal, Jurong County in Jiangsu province.
2010 Vol. 30 (第3期): 39-42 [
Abstract
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2509
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43
INTERPOLATION METHOD BASED ON LEAST SQUARESCOLLOCATION FOR DYNAMIC GRAVITY CHANGES
Peng Zehui;Li Hui;Shen Chongyang;and Sun Shaoan;
The method of least squares collocation for making grid of discrete data was used to obtain the petlern of dynamic gravity changes. Comparing with the several commonly used interpolation methods,such as Kriging, the results show that the accuracy is as well as or slightly better than those with other methods, and the images are smooth relief and with flowlines.It is shown that this method can efficiently describe the morphological and characteristics of the dynamic changes of gravity field.
2010 Vol. 30 (第3期): 43-46 [
Abstract
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1952
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47
DISCUSSION ON BASELINE CORRECTION OF STRONG MOTION DATA
Zheng Shuiming;Zhou Baofeng ;Wen Ruizhi ;and Wang Lan;
The sources of some primary low frequency noise effecting on strong motion acceleration are analyzed. To remove the noise, three schemes of baseline correction are introduced, and the effect of the schemes on the velocity and displacement time series integrated the processed acceleration is pointed out. Apply the schemes, three typical accelerations of Wenchuan Ms8.0 earthquake are corrected, and some questions are also put forward for the consideration of baseline correction.
2010 Vol. 30 (第3期): 47-50 [
Abstract
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2305
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51
ANALYSIS OF SOLAR ECLIPSE IONOSPHERIC ANOMALIESON JULY 22,2009 AT WUHAN STATION
Zheng Yanli;Nie Guigen;and Ren Yongchao
On the basis of the GPS observations obtained at the Wuhan IGS station of CMONOC, the TEC and ROT of satellite transmission path on July 22 and the days before and after it were calculated. The results show that ionospheric anomalies existed during the solar eclipse, the TEC is lower than those on the days before and after it.8 hours after the solar eclipse, the ROT experienced a process of going down and recovery, the largest degradation is almost 0.3TECU/minute.
2010 Vol. 30 (第3期): 51-54 [
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2296
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55
RESULT ANALYSIS OF IONOSPHERIC TOMOGRAPHYINVERSION FROM GPS DATA OVER CHINA
Wen Debao ;and Zhou Yiyan
For the limitations of singlelayer ionospheric model, the annual timeseries variations of electron density distributions over China are inverted by using the ionospheric tomography technique and the dualfrequency GPS observations from Curstal Movement Observation Network of China (CMONOC) in 2003. The diurnal varying characteristics of ionospheric electron density over China, especially the development and disappearance of the equatorial anomaly core and the variations of the vertical structure of ionosphere are investigated. The difficulties and problems for using GPS data to inverse the electron density profiles in China are discussed and some suggestions are given for further investigation.
2010 Vol. 30 (第3期): 55-58 [
Abstract
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1819
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59
STUDY ON IMPROVING DEFORMATION MONITORING ACCURACY BY USING INTEGRATED GPS AND InSAR
Chen Hua ;and Gan Weijun
On the basis of comprehensively integrating the current GPS and InSAR techniques, a method of integrating GPS, InSAR and Corner Reflectors(CR) is proposed. Through some demonstrations and preliminary empirical work,it is proved that the method is feasible, and can reduce the number of error factors, greatly improve the accuracy of deformation monitoring.
2010 Vol. 30 (第3期): 59-62 [
Abstract
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1867
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理论方法研究
63
CONCISE ALGORITHM AND ACCURACY ANALYSIS OF CIRCLE PILE POSITIONING WITH TOTAL STATION BY ADOPTINGMETHOD OF ONE POINT AND ONE DIRECTION
Yao Lianbi;and Xie Yilin
Up to now,there are no sophisticated and effective methods of circle pile position in piling engineering.
A concise, stable and reliable algorithm to position circle pile is introduced, which is surveying one 3D point coordinate on pile surface and one tangent direction of pile side in the same level. The tangent coordinate system and ellipse coordinate system were built in this position model. According to the restraint relationship between the measurements, the coordinate of circle pile center can be obtain. At last, the
achievable accuracy of this algorithm is analyzed. The field test data and calculated results verifly the correctness of this algorithm.
2010 Vol. 30 (第3期): 63-66 [
Abstract
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2090
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67
GPS HEIGHT CONVERSION METHOD WITH ADDITIONAL STOCHASTIC MODEL
Wu Han;and Yao Yibin
The method based on existing GPS height transformation function model with increasing the stochastic model is put forward to improve the accuracy of GPS height transformation. Through a case of increasing stochastic model on the secondorder polynomial fitting model, it proved that with this method the accuracy of GPS height transformation can be improved more.
2010 Vol. 30 (第3期): 67-70 [
Abstract
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1836
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71
AN IMPROVED BURSA MODEL FOR COORDINATE TRANSFORMATION
Chen Yu;Bai Zhengdong;and Luo Teng
Considering the graph error and surveying error of common points centralized in a small region in solving unknown transformation parameters of Bursa model,an improved transformation model by moving the origin point of the coordinate system to the barycentre of the common points is introduced. The new method has been proved to be better than the traditional Bursa model by using real data and simulated results.
2010 Vol. 30 (第3期): 71-73 [
Abstract
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2452
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74
SOLVING COORDINATE TRANSFORMATION PARAMETERS BASED ON TOTAL LEASTSQUARES REGRESSION
Kong Jian;Yao Yibin;and Xu Shuang’an
On the basis of the mathematical meaning of the overall leastsquares,through transformating conditional extremum to direct extremum, the formulas of solving transformation parameters by overall leastsquares regression are derived
and the nonlinear problem in parameters estimation is solved with the parameter transformation method to
avoid the issue of linearization. The feasibility of this new algorithm is verified by measurement data and the problem of theory defect in traditional method was solved. Futher more in order to meet the different conversion models used in different regions, the parameter estimation formula for affine transformation mode is derived.
2010 Vol. 30 (第3期): 74-78 [
Abstract
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1851
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79
A PREDICTING MODEL OF IONOSPHERIC BASED ON ARIMA(p,1,1)
Liu Jun ;Chai Hongzhou;Liu Xiandong;and Chen Ke
Modeling point by point of the grid data of ionospheric released by IGS with ARIMA(p,1,1), the prediction results with linearity least variance prediction method (common prediction method) and correcting prediction method are compared. The experimental results show that accuracies of most points are higher with the correcting prediction method in a short time, but larger deviation will appear at the extreme point of VTEC. Common prediction method can reach a satisfied accuracy in a long time.
2010 Vol. 30 (第3期): 79-82 [
Abstract
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1924
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83
EFFECTS OF HORIZONTAL VARIATION OF TROPOSPHERIC DELAY ON GPS SURVEYING
Chen Zhaohua;and Dai Wujiao
There are weather condition differences in different location in small areas, as a result，the tropospheric delay can not be completely eliminated with the usually used double difference technology. In order to analyze the residual tropospheric delay effect which caused by the different weather condition between the ends of the baseline, several tests with baselines of different length were carried out by using the data from Hong Kong CORS. The followings conclusions can be drawn from these test results.1) When the baseline is more than 15 kilometers, the residual tropospheric delay is the main error sources affecting the accuracy of GPS height measurement, and the longer the baseline length is, the bigger the error of the residual tropospheric delay is. 2)When the baseline length is close to or over 30 kilometers, baseline solution often fails because of the lange residual tropospheric delay.3)The tropospheric delay in horizontal direction is more diversed in the humid and hot weather conditions, and the accuracy of the GPS height measurement decreases more.
2010 Vol. 30 (第3期): 83-87 [
Abstract
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1704
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88
OPTIMAL EXPRESSION OF A REGIONAL GPS GEODETIC NETWORK IN TERRESTRIAL REFERENCE FRAME
Wang Peng;Lu Zhiping ;and Zhang Xiguang
Aiming at the basic requirement of maintenance of Terrestrial Reference Frame(TRF) ，the deficiency in dataprocessing for regional GPS Geodetic Network(GeoNet) is analyzed currently and then the minimum constraints (MC) approach to solve or reconstruct the solution of regional GPS GeoNet is described. Through comparing several constrained solutions，
the results show that the MC approach is an optimal method to express the regional GPS GeoNet in TRF finally.
2010 Vol. 30 (第3期): 88-91 [
Abstract
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1775
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92
APPLICATION BASED ON SECONDGENERATION WAVELET IN SIGNALDENOISING OF GPS DOUBLE DIFFERENCE OBSERVATIONS
He Yonghong ;Wen Hongyan ;and Jin Pengwei
The principle and procedures of second-generation wavelet transform and application in the de-noising of GPS data processing are discussed.An example for GPS data processing proved that the lifting scheme is effactive.
2010 Vol. 30 (第3期): 92-95 [
Abstract
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1833
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96
INFLUENCE OF STATISTICS OF ERRORS AND INITIAL PARAMETERS ON ROBUST ESTIMATION
Li Jinlong ;and Xu Junyi;
In robust estimation，it is very difficult to obtain robust initial parameters, so a new method which estimate initial parameters based on initial equivalent weights of high breakdown point is proposed to more effectively
reject the effcets of gross errors. It is demonstrated that initial parameters estimated with the proposed method
may have more reasonable equivalent weights. When the observations are seriously contaminated by gross errors, this method remains effective.
2010 Vol. 30 (第3期): 96-99 [
Abstract
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1785
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3314
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100
EULERWAVELET METHOD AND ITS APPLICATION IN IDENTIFICATION OF COMMONMODE ERROR FROM TIME SEQUENCES OF HORIZONTAL COMPONENTS OF GPS CONTINUOUS STATIONS
Yang Bo;Zhang Fengshuang;and Han Yueping
The commonmode error is the main component of GPS time sequences. The available Eulerfiltering method
is valid for identification and estimation of white noise which is a only part of the commonmode error. Combining with the priori error, Euler and wavelet methods, and the characteristics of crustal deformation analysis, the identification and estimation style of the commonmode error are further discussed, and different processing techniques corresponding to different situations are proposed. Through these kinds of processing, the commonmode error can decrease to the most extent.
2010 Vol. 30 (第3期): 100-104 [
Abstract
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2125
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105
ON MODEL COMBINED FORECASTING OF TEMPORAL DATA BASED ON PURSUIT PROJECTION LEARNING NETWORK
Yan Yong ;Yang Bisheng ;and Wang Ying
Aiming at observed time series data, a new forecast model which has the advantages of combination prediction and Pursuit Projection Learning Network(PPLN) is put forward. The model uses several static forecasting models to obtain the tendency part and uses the regression model for periodic part, then takes them as input signals of PPLN, calculates the weights between the models by PPLN which has the ability to approximate the complex nonlinear function. The model resolves a difficult problem of combination prediction.The experimental results show that new forecast model has a higher accuracy than traditional curvefitting or combination forecasting method with variable weight, can be applied to other data prediction problems in the subject of surveying and mapping.
2010 Vol. 30 (第3期): 105-109 [
Abstract
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2413
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110
STUDY ON PRECISE POINT POSITIONING ACCURACY AFFECTED BY DCB
Huang Jian ;Wang Ping ;Ruan Rengui ;Lin Yuying ;and Zhang Yong
The satellite clock error which includes satellite differential code bias(DCB) in observation model of precise point positioning is analyzed and the expressions of DCB is given when satellite clock error being corrected by IGS precise clock products. Experimental results show that in staticly positioning the influence of DCB error is very small, so it can be ignored, but in dynamicly positioning it can make the postioning results some centimeter error, so it must be dealt with carefully.
2010 Vol. 30 (第3期): 110-112 [
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2403
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113
STUDY ON IMPACT OF ANTENNA PHASE CENTEROFFSETS,VARIATION AND THEIR CORRECTION MODELS ON GPS PRECISE POINT POSITIONING ACCURACY
Tu Rui ;Huang Guanwen ;and Zou Shun
Firstly,the methods and models for correcting antenna phase center offsets(PCO) and phase center variations(PCV) in highaccuracy GPS positioning are introduced,then using precise point positioning procedures the measured data of IGS stations are calculated and analyzed.The results show that in horizontal direction,
PCO and PCV less influence on precise point positioning precision,while in elevation direction,
PCV brings about cm level effect and the effect of PCO is in 5 mm.Compared with the relative antenna phase correction model,the absolute phase correction model has more advantages, especially in high precision GPS clocking.
2010 Vol. 30 (第3期): 113-117 [
Abstract
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1923
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118
CORRECTION OF IONOSPHERIC DELAY FOR REALTIME ORBITDETERMINATION BY USING ONBOARD SINGLEFREQUENCY GPS DATA
Zheng Lei ;Li Zhenghang ;and Liu Wanke
The method of “ionospheric scale factor” is modified and implemented and the universal and effectivity of the method to correct the ionospheric delay are validated by using the CHAMP LEO’s data of different solar activities and orbit altitude conditions.
2010 Vol. 30 (第3期): 118-121 [
Abstract
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1820
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122
EXCHANGE OF DELAUNAY TIN BETWEEN MATLAB AND GMT IN CRUSTAL STRAIN CALCULATION
Xiao Genru;Gan Weijun ;and Chen Weitao
The traditional method for crustal strain calculation is constructing triangulation with all the GPS sites first, and then calculating the strain of every triangulation. If the different algorithms:Matlab and GMT are adopted,then for the same data set the different trianggulation outputs will be obtained.By the study of the data formats output from the constructed triangulation results with Matlab and GMT we have programmed the transform between both the results in the Peal language thus realized the transform to each other between the software Matlab and GMT in mapping Delaunay triangulation and constructed the same triangulation results.When in mapping we combined the geographic manuscriptmap,thus we have achieved a good expressing results.
2010 Vol. 30 (第3期): 122-126 [
Abstract
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2029
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127
DInSAR ATMOSPHERIC DELAY CORRECTION BASED ON MODIS AND GPS
Yang Chengsheng;Zhang Qin;Zhao Chaoying;Zhu Wu;Wang Ya’nan;and Wang Hongyu
The radar signal propagation delay caused by the spatiotamporal change of atmospheric water vapor contents changing
is one of the major error sources for interferometry SAR (InSAR).
By using GPS observation data of seven terms from July 2006 to July 2009, and the corresponding MODIS data in Xi’an,the MODIS water vapor correction model is studied, and an experiment of DInSAR atmospheric delay correction in Xi’an area is carried out.
Compared with GPS observations, the results show that MODIS data can be used to correct atmospheric delay in DInSAR results when the atmosphere state change slowly, though the accuracy improvement is not very obvious.
2010 Vol. 30 (第3期): 127-131 [
Abstract
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1895
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132
STUDY ON ZENITH TROPOSPHERIC DELAY INTERPOLATION METHODS FOR DIFFERENT TERRAIN
Wang Yong;Jiao Jian ;Zeng Qiming ;and Liu Yanping
It is one of the key issues to further enhance the accuracy of interferometry that how to effectively improve the atmospheric effects in InSAR. Using GPS technique to correct atmospheric delay of InSAR is the most effective method.
From the GPS data of Beijing and Wuhan, the Inverse Distance Weighted and Kriging interpolation methods are adopted to study the effect on tropospheric delay interpolation for different terrain. It is concluded that there are the same effect between Inverse Distance Weighted method and Kriging interpolation method. The effects on tropospheric delay interpolation are different in Wuhan and Beijing. The interpolation effect in Wuhan region with the methods are the same,they amounts to millimeters, while the effects are different from eath other in Beijing,that it can be to millimeter in the flat region, while to centimeter in mountain area. Thus the terrain correction should be made for interpolation in order to apply the atmospheric correction of InSAR with GPS zenith tropospheric delay.
2010 Vol. 30 (第3期): 132-136 [
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2269
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137
COMPARISON OF EMD WITH WAVELET DECOMPOSITION FORDYNAMIC DEFORMATION MONITORING
Luo Feixue;and Dai Wujiao
Both wavelet decomposition and empirical mode decomposition (EMD),a new signal processing method,
can be used for denoise and multiscale decompose GPS measurements to obtain the deformation information.
To analyze the feasibility and effect of this method, the simulated data and GPS data collected from the table test are used to test the ability of EMD and wavelet in signal denoising and multiscale decomposition.
From these tests,the following conclusions that both the EMD and wavelet are good for extracting the vibration of the structure. However, when the data is noised heavily, the stability of wavelet is better than EMD in denoising and multiscale decomposition, while the EMD is an adaptive method based on the data itself, and free from the choise of wavelet base and the number of decompose layer.
2010 Vol. 30 (第3期): 137-141 [
Abstract
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2015
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142
ERROR EFFECT OF DISTURBING GRAVITY VECTOR ON INERTIAL NAVIGATION SYSTEM
Li Shanshan;Wu Xiaoping;and Wang Kai
The mathematic methods of position and velocity errors in Inertial Navigation System caused by disturbing gravity vector are discussed.Through the calculation of the data of a certain oceanic area where the gravity anomalies are known
the magnitude and characteristics of the errors are also studied. The output information of gravity sensor in GravityAided Inertial Navigation System can be applied in gravity matching to correct gyroshifting errors of inertial navigation cumulated with time and also be used in gravity correction to eliminate Schuler errors caused by the fact that the normal gravity rather than the actual gravity is used in the mechanical equation.
2010 Vol. 30 (第3期): 142-146 [
Abstract
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1847
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147
GIVENS TRANSFORMATION WITH WEIGHTED PARAMETERAND ITS APPLICATION IN NAVIGATION SATELLITE BROADCAST EPHEMERIS FITTING
Cui Xianqiang;
The formula of Givens transformation with weighted parameter
which is used to control the estimator range of the navigation satellite ephemeris parameters is deduced.
The results show that Givens transformation with weighted parameter not only is steady in numerical computation and efficient in calculation but also can easily give the prior weight of the ephemeris parameters and expediently make the abnormal navigation satellite parameters back into the prescriptive range.
2010 Vol. 30 (第3期): 147-150 [
Abstract
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1879
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观测技术
151
TRANSFER FUNCTIONS AND RESPONSES OF DZW GRAVIMETER AND VS-1 TILTMETER
Jiang Jun;Chen Decong;Lin Gang;Zhang Yanbin;Ma Xiaofei;and Li Chang
DZW gravimeter and VS1 tiltmeter are important technical equipments for earthquake monitoring. “abnormal tremor waves” observed by the two instruments were reported at HUST station. The composition and principle of the system of the instruments are introduced. The transfer function of the instrument is given at the first time, and the characteristics and the parameter verification of them
are described, the observation phenomenon is analyzed.
2010 Vol. 30 (第3期): 151-155 [
Abstract
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2072
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156
STUDY ON PROGRAM OF PRECURSOR INSTRUMENTS INTO NETWORK
He Anhua ;Huang Xiaohua ;Chen Yide ;Xiong Xianbao ;and Zhao Gang
Under retaining the original “Ninth Five Year Plan” communication mode, completing the “Ninth Five Year Plan” precursor instruments’ access to the “Tenth Five Year Plan” precursory data management system at Xiamen seismostation. Experimental results show that the program is running stably with low error rate, fully compatible with “Ninth Five Year Plan” standard and with “Tenth Five Year Plan” regulation.
2010 Vol. 30 (第3期): 156-159 [
Abstract
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1862
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