大地测量与地球动力学
 
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2009 Vol.29 Issue.2
Published 2009-06-05
院士论坛
1 PROGRESS IN GNSS AND ITS INFLUENCE ON NAVIGATION AND POSITIONING
Chen Junyong;
Introduced the new developments of GPS and GLONASS, the differences in technique between them, and the three steps of the GPS modernization. Besides, the future developments of Galileo and Compass are also introduced. In few years navigation satellite system will step forward a new era, i.e. multiGNSS and hundred navigation satellites will exist simultaneously in the sky over the Earth, then it will obviously improve the availability, continuity and reliability in the navigation and positioning, and their costumer have to face how to use it in optimum.
2009 Vol. 29 (2): 1-3 [Abstract] ( 2107 ) PDF (372 KB)   ( 3152 )
地壳形变与地震
4 RESEARCH ON TECTONIC STRESS FIELD DISTRIBUTION WITHIN CRUST
Dang Yamin;Yang Qiang ;and Cao Xuewei
According to spherical harmonic coefficients of 360 orders of EGM96 Earth’s gravity field model, density anomaly and tectonic stress in different depth of crust have been calculated. We can draw the following conclusions:1) In the area that there is large variation of density anomaly, tectonic stress is also have a large variation. Thus the density anomaly may be the main cause of tectonic movement;2) If density anomaly is constant, tectonic stress will increase with the increase of depth;3) The average tectonic stresses of three spherical layers located in 25~20 km,32~25 km and 36~32 km are tensile stress, their typical values is 100 MPa,120 MPa and 150 MPa, respectively.
2009 Vol. 29 (2): 4-6 [Abstract] ( 2021 ) PDF (962 KB)   ( 3234 )
7 NUMERICAL SIMULATION OF GROUND STRESS FIELD AT ENDS AND VICINITY OF A FAULT
Sun Lijian ;Zhu Yuanqing ;Yang Guangliang ;and Yinjiyao
The effect of fault structure on ground stress field is studied by using finite element method. The results indicate that, fault scale, elastic modeling quantity of a fault and rockbody, the angle between maximum horizontal principal stress and fault direction, stress border and fault geometry are the main factors of ground stress distribution at the ends and vicinity of a fault.
2009 Vol. 29 (2): 7-12 [Abstract] ( 2181 ) PDF (5900 KB)   ( 3625 )
13 NUMERICAL SIMULATION OF ANNUAL CHANGE CHARACTERISTICS OF TECTONIC STRESS-STRAIN FIELD IN YUNNAN AREA
Li Yujiang ;Chen Lianwang ;and Li Hong
On the basis of the geological structure, 3D velocity structure and seismic activity in the Yunnan area a 3D finite element model is established. for simulating the presentday annual change characteristics of tectonic stressstrain fields in Yunnan area. The results indicate that: 1) The crustal movements in the north and west of the area are stronger than that in the south and east, also the Yunnan area is characterized by clockwise rotation around the eastern Himalayan syntaxis. 2) Because of the subduction of the India plate, the directions of the crustal movement are as follows: in the east of Red river fault, it’s from SEE in the north to SE in the south, while in the west it’s SE-NS-SW. 3)The maximum principal strain shows the pattern of higher value in the west and north but lower in the east and south, also the maximum value reaches 10 -8, it’s mainly on the western Yunnan area, both sides of the Anning river fault and the north segment of Xiaojiang fault. 4)The maximum principal stress are mostly located along the faults zones and their intersections, the distribution of the maximum differential stress accords with it.In addition, in the south of Yunnan area the differential stress is high, and is tensile, while that is mostly compressive in the other place.
2009 Vol. 29 (2): 13-18 [Abstract] ( 2242 ) PDF (6956 KB)   ( 3028 )
19 FORWARD SIMULATION OF GEOID IN MIDDLE-SHORT WAVELENGTH IN TIBETAN PLATEAU
Ke Xiaoping;Wang Yong;and Xu Houze
On the basis of the threedimensional(3D) layered models of crustal structures from the 3D forward simulation of gravity in Tibetan plateau and by use of the software of IGMAS the geoidal undulations caused by the inhomogeneity of threedimensional crustal structures in Tibetan plateau are simulated. The study shows that, the geoid in middleshort wavelength is produced by the inhomogeneity of density between each layer within the crust in Tibetan plateau, it means that the interface undulation is the main mechanism of geoid in middleshort wavelength. For each layer, the main reason of geoid changing in middlehigh frequency is the material inhomogeneity between lower crust and upper mantle, secondly, is the inhomogeneity between middle crust and lower crust, the influence of inhomogeneity between upper crust and middle crust on geoid is less. The material inhomogeneity because of the low velocity layer has a great effect on geoid.On the basis of the threedimensional(3D) layered models of crustal structures from the 3D forward simulation of gravity in Tibetan plateau and by use of the software of IGMAS the geoidal undulations caused by the inhomogeneity of threedimensional crustal structures in Tibetan plateau are simulated. The study shows that, the geoid in middleshort wavelength is produced by the inhomogeneity of density between each layer within the crust in Tibetan plateau, it means that the interface undulation is the main mechanism of geoid in middleshort wavelength. For each layer, the main reason of geoid changing in middlehigh frequency is the material inhomogeneity between lower crust and upper mantle, secondly, is the inhomogeneity between middle crust and lower crust, the influence of inhomogeneity between upper crust and middle crust on geoid is less. The material inhomogeneity because of the low velocity layer has a great effect on geoid.
2009 Vol. 29 (2): 19-23 [Abstract] ( 2173 ) PDF (4265 KB)   ( 3256 )
24 STATISTICAL TEST OF PRECURSORY WAVES BEFORE WENCHUAN Ms8.0 EARTHQUAKE
Zhou Longshou;Qiu Zehua;and Tang Lei
The precursory waves before Wenchuan 8.0 earthquake are statistically tested by use of the observed strain data with the 4component borehole strainmeters at 16 stations around the epicenter.In which, first of all, the influence of solid tide whose period is longer than 128 minutes is removed with highpass filter,and the secondly,airpressure influence is removed with linear regression method,
and then the signals for 2～128 minutes are decomposed into 6 different kinds of frequency bands with wavelet transform method.
The results indicat that wavelet transform can be used to identify small change existed in deformation signal.
On the basis of the characteristics of precursory wave indentified by wavelet transform,and the overrun rate method will be used to test
the details of wavelet decomposing,and then the regression line slope of the overrun rate time sequence of entire details will be statisticed,thus the average and standard deviation can be obtained.
These data show that precursory waves can not be generally detected during 15 day before earthquake.
2009 Vol. 29 (2): 24-28 [Abstract] ( 2224 ) PDF (3148 KB)   ( 3458 )
29 CO-SEISMIC RESPONSE AND POSTSEISMIC EFFECT OFGEOTHERM ON WENCHUAN Ms8.0 EARTHQUAKE
Zhao Gang ;Wang Jun ;He Anhua ;and Qing Jiugang
On the basis of data of 277 countrywide geothermal precursor stations, the response of China geothermal earthquake precursor network to Wenchuan Ms 8.0 earthquake is studied. It is found that there are coseismic and postseismic changes in 134 stations.
According to the form,co-seismic response and postseismic adjustment can be devided into four types:gradual change,step change and resuming,impulse and oscillation.In adition,it is found that the postseismic adjustment of geotherm contains the information of the adjustment of local strain status.
2009 Vol. 29 (2): 29-32 [Abstract] ( 2120 ) PDF (2510 KB)   ( 3091 )
33 EXPERIMENT ON FAULT TECTONICS WITH DEEP SEISMIC REFLECTION DETECTION IN YINCHUAN BASIN
Zhao Chengbin ;Fang Shengming ;Liu Baojin ;Ji Jifa ;Feng Shaoying ;Guo Xinjing ;Li Jichang ;and Qin Xueye
“Deep seismic reflection detection tests of faults in Yinchuang basin” is a detection method test of Urban active fault for
finding out the suitable working parameters and construction method in the seismic exploration work to meet the needs of active fault detection in large city areas. The tests include seismic wave excitation parameter test, observation system parameters test and seismic reflection data processing test.On the basis of various parameters test and data processing method test, we have too conducted urban active fault detection test in Yinchuan basin by use of the working parameters and methods acquired in above tests.Through the tests, the clear images of the deep and shallow structure of Yinchuan basin are obtained.
2009 Vol. 29 (2): 33-38 [Abstract] ( 2079 ) PDF (4056 KB)   ( 3656 )
39 ANALYSIS OF APPLICATION OF AIR GUN TO DEEP CRUST EXPLORATION
Yang Guangliang ;Zhu Yuanqing ;and Sun Lijian
On the basis of the drilling data at a seismostation in Shanghai, the absorption medium model of cover and deep crust layer was established. The absorption and attenuation of airgun wavelet in the absorption medium were analyzed. The relation between the fault length which can be resolved and the depth of the earth layer. The results show that the signal’s energy decays faster within 5 km than within deep crust, and with the increases depth of the attenuation rate reduces. In depth of 25 km, the attenuation reaches 93 dB. When main frequency of the air gun’s wavelet is 6 Hz,the attenuation of wavelet is very small (the decay rate of lowfrequency can be ignored), the depth of the earth layer which can be resolved from 75 m increases to 290 m gradually.
2009 Vol. 29 (2): 39-42 [Abstract] ( 1972 ) PDF (927 KB)   ( 3201 )
43 SYNTHETIC CHARACTERISTICS OF SEA TIDE DISTURBANCE IN GROUND TILT OBSERVATION AT XIAMEN SEISMOSTATION
Xiong Xianbao;Huang Xiaohua;Yang Jie;Lin Lifeng and;Xu Zhiming
The characteristics of the sea tide disturbance from the ground tilt observations at Xiamen seismostation was studied.
The results show that 1) The diversity and complexity of the tide disturbance in observations are caused by tide loading, tidal current, azimuth of instruments establishment and special geographical location of the station t;2) The degrees of magnitude and phase disturbing are intensively correlated with azimuth of instruments establishment.
2009 Vol. 29 (2): 43-47 [Abstract] ( 2058 ) PDF (2221 KB)   ( 3172 )
48 ON IMPACTS OF SOLID EARTH TIDE MODELS ON GPS COORDINATE TIME SERIES
Yin Haitao;Li Jie;Ma Pifeng;and Xu Dan
The effects of the IERS2003 and IERS1992 models on GPS baselines, radial coordinate and zenith tropospheric delay are analyzed by use of the data from crustal movement GPS continuous observation network of Shandong and around IGS stations. The results show that the effects on baselines are at submm level, the differences of vertical component is proportional to latitude of stations. In addition, the amplitudes of diurnal signals in ZTD time series are about 0.6-1.0 mm, which is about 6%-8% of solid earth tide difference.
2009 Vol. 29 (2): 48-52 [Abstract] ( 1998 ) PDF (1562 KB)   ( 3799 )
53 ACCURACY EVALUATION OF AIRBORNE GRAVIMETRY OVER MODERATE MOUNTAIN AREA
Sun Zhongmiao;Xia Zheren;Li Yingchun;and Zhai Zhenhe

The state of airborne gravity survey using CHAGS over a certain moderate mountain is introduced, and the observed data are analyzed. The results indicate that the standard derivations of the crossover points errors is 5.0×10 -5 ms -2 and the external accuracy of the 5′×5′ mean gravity anomaly compared with reference gravity is about 5.5×

10 -5 ms -2 under moderate turbulence.
2009 Vol. 29 (2): 53-56 [Abstract] ( 2156 ) PDF (1686 KB)   ( 3441 )
57 GRAVITY ANOMALY CORRECTION IN PRECISE LEVELING
Wang Jianhua;Wang Xiong;Hu Yaxuan;Liang Weifeng;Su Rui;and Hao Ming
In order to study the gravity anomaly correction affected by the different density of gravity stations in the uneven terrain when the precise leveling is performed, the gravity anomaly corrections are calculated in Hexi area ,where the leveling circuit have enough observaions.Having compared the gravity anomaly corrections with that calculated from Bouguer anomalies map, the results show that the correction value is affected by the distribution and density of the gravity sites. When they are good, the quality of the precise leveling will be improved.
2009 Vol. 29 (2): 57-60 [Abstract] ( 2466 ) PDF (1538 KB)   ( 4153 )
61 PLATE BOUNDARY MODEL PB2002 AND SOME THOUGHTS ON ESTABLISHMENT OF PLATE BOUNDARY MODEL IN CHINA
Zhang Xiguang;Li Jian;and He Shun
Plate tectonic models have developed successfully for a long time,
but there are no generallyaccepted standard references on plate boundary locations worldwide. Peter Bird gives a model of present plate boundaries on the Earth in digital form, based on sources in the literature. The paper presents the PB2002 given by Peter Bird and his research method for this model and results briefly. The establishment of PB2002 refers hardly any geoscience research of Chinese scholars in Chinese regions. Considering the complexity of lithosphere motion in Chinese regions, there are several methods for dividing the plate boundary according to different hypothesis. In addition, considering that the plate boundary model are given in the form of smallscale maps or sketchs, the paper brings forward some thoughts on establishing plate boundary model in Chinese regions.
2009 Vol. 29 (2): 61-65 [Abstract] ( 2039 ) PDF (2973 KB)   ( 3430 )
66 APPLICATION OF L-CURVE TO THE INVERSION OF PRESSURE SOURCE PARAMETERS IN VOLCANO AREA
Hu Yaxuan;Hao Ming;Wang Xiong;Wang Qingliang;and Cui Duxin
When inversing the pressure source parameters of a volcanic area by use of deformation data, the condition of coefficient matrix after linearization is too bigger to get a stable inversion of normal matrix.
Lcurve method is used for determining ridge parameter with the theoretical and real data in ChangbaishanTianchi volcano. The results indicate that Lcurve can solve illposed problem fast and conveniently.
2009 Vol. 29 (2): 66-70 [Abstract] ( 2112 ) PDF (1596 KB)   ( 3143 )
71 PRESENT SITUATION AND PROGRESS OF WIDE SWATH SAR FOR MONITORING CRUSTAL DEFORMATION
Jiang Tingchen;Li Tao ;Liu Jingnan ;Zhang Shiyu ; and Long Sichun
The wide swath SAR (ScanSAR model) has some advantage,such as wider swath and short interval, and it can form interferometry with else SAR models for example IM model,so that more interference images can be generated in data processing.Therefore, ScanSAR model can be used in deformation, especially small deformation survey in the future. In this paper, wide swath SAR imaging algorithm is introduced and the interference of different SAR models are expatiated.In the end, development direction about wide swath SAR，for example, interferometry between WSM and IM model, atmosphere correction algorithm based on WSM , application and study of CR and PS technique for WSM, are introduced especially.
2009 Vol. 29 (2): 71-75 [Abstract] ( 2069 ) PDF (1061 KB)   ( 3248 )
理论方法研究
76 INFLUENCE OF TIDE PERTURBATION ON AUTONOMOUS ORBIT DETERMINATION OF NAVIGATION SATELLITE
Li Zhenghang;Gong Xiaoying;and Liu Wanke
The paper discusses the existence and unobservability of the constellation rotation error of autonomous orbit determination of navigation satellites with crosslink ranging observation as well as the rank defect problem; then analyzes the influence of tide perturbation on
the constellation rotation error and autonomous orbit determination. The processing results of simulation data indicate that tide perturbation has a great impact on the error of alongtrack and cross of autonomous orbit determination(the relative error is about 4 m in the 110th day) and the impact will become bigger with the increase of days of the autonomous orbit determination. Therefore, the influence of tide perturbation must be considered in the highprecise and longtime autonomous orbit determination.
2009 Vol. 29 (2): 76-81 [Abstract] ( 1964 ) PDF (2640 KB)   ( 2979 )
82 STUDY ON MODEL BUILDING IN RHA OF LOCAL OCEAN GEOMAGNETIC FIELD
Zhao Jianhu;Liu Hui;and Wang Shengping
In order to analyze the local geomagnetic field model according to the potential theory, based on studying and analyzing the theories and method of rectangular harmonic analysis (RHA) for building local geomagnetic model, several key problems, such as quality control of geomagnetic data, the representness and resolution of data, the choice of truncation order of geomagnetic model and boundary effect and its elimination, are discussed. At the same time, a kind of idea for building model by subarea is presented and applied to an actual China marine region. The new method is compared with the method of spherical cap harmonic analaysis (SCHA) and Talyor ploynimial method.
A conclusion is that RHA has high accuracy in building local marine geomagnetical model.
2009 Vol. 29 (2): 82-87 [Abstract] ( 1969 ) PDF (3080 KB)   ( 3182 )
88 STUDY ON FAST CONVERGENCE METHOD IN PRECISE POINT POSITIONING
Hao Ming;Wang Qingliang ;and Cui Duxin
The current mathematical model and parameter estimation method in Precise Point Positioning (PPP) are introduced, and then the way to improve convergence in PPP is introduced. The improvement includes: 1) the adaptive filtering by selection of the parameter weights is applied in the parameter estimation; 2) the selecting weight fitting method is employed to determine the initial parameters and corresponding variancecovariance. According to the new method, the paper develops the PPP using IGS rapid precise ephemeredes products (latency of 17 hours).The calculation examples demonstrate that the position precision can achieve decimeter to centimeter in the short time, and satisfy the requirement of efficiency.
2009 Vol. 29 (2): 88-91 [Abstract] ( 2005 ) PDF (1957 KB)   ( 3333 )
92 ALGORITHM FOR SOLVING ADJUSTMENT MODELWITH INEQUALITY CONSTRAINED PARAMETERS
Song Yingchun; Liu jie ;and Hui Shenying
The work is on using the Lemke algorithm to solve adjustment model with inequality constrained parameters,but some improvements are made.Firstly, the inequality constrained leastsquare problem is translated to convex quadratic programming problem, and then translated to the linear complementarity problem (LCP) using KuhnTucker conditions of quadratic programming, at last,the Lemke algorithm is used to obtain the optimum solution and a general form of leastsquares estimation in adjustment model is given. A comparative calculation on a simulated example indicates that the improved algorithm can praclically be applied to adjustment computation.
2009 Vol. 29 (2): 92-95 [Abstract] ( 2142 ) PDF (347 KB)   ( 3140 )
96 COMPARISON AND INVESTIGATION OF VAV AND ETERNA TIDAL ANALYSIS METHODS
Tian Guie ;Chen Xiaodong ;Sun Heping ;Chen Guang ;Song Lijie ;and Liu Nannan
The drift model,regression factor of airpressure and disturbance eliminating of VAV and ETERNA tide analysis methods
are compared and studied theoretically. Then further,the data observed with superconducting gravimeters at Wuhan station are analyzed by use of these two relevant softwares,we can get smaller stand deciation after interation from VAV than ETERNA method,
but the differences between the analyzed value and the theoretical amplitude factor is at the same level.
2009 Vol. 29 (2): 96-99 [Abstract] ( 2033 ) PDF (573 KB)   ( 3778 )
100 OPTIMAL DESIGN OF ORBITAL ALTITUDE IN SATELLITE-TO-SATELLITE TRACKING MODEL
Zheng Wei;Xu Houze ;Zhong Min ;Yun Meijuan ;Zhou Xuhua ;and Peng Bibo
The GRACE Earth’s gravitational field complete up to degree and order 120 is recovered based on different orbital altitude
according to the improved energy conservation principle. The simulative results show: Firstly, with the decrease of orbital altitude per 100 km, atmospheric drag will increase 10 times approximately, and the unstable work environment of satellite platform will influence the measuring accuracy of GRACE key payloads.Secondly, the highfrequency signals of Earth’s gravitational field will be attenuated quickly. Attenuation factor comes to 0.221 based on 500 km orbital altitude at degree 20, and attenuation effects increase 9.621 times, 92.857 times, 418.957 times and 1895.369 times at degree 50th, degree 80th, degree 100th and degree 120th, respectively. Thirdly, low orbital altitude is good for improving the accuracy of Earth’s gravitational field recovery. Cumulative geoid height error is at the level of 17.316 cm using 500 km orbital altitude at degree 120th, and the accuracies improve 1.566 times, 4.502 times and 10.871 times as using 450 km, 400 km and 350 km orbital altitude combined with GRACE other indexes published by JPL, U. S., respectively; Lastly, orbital altitude designed as 350 ~ 400 km for future satellitetosatellite tracking model will be propitious to the Earth’s gravitational field recovery complete up to degree and order 120.
2009 Vol. 29 (2): 100-105 [Abstract] ( 2929 ) PDF (1600 KB)   ( 3356 )
106 ANNUAL PERIOD CHANGES OF ZENITH TROPOSPHERIC DELAY OF CORS STATIONS IN TIANJIN DISTRICT
Tang Chaohua;Li Tao;Shi Chuang;and Zhang Shiyu
The annual period changes of zenith tropospheric delay for two years were calculated from the observations of 9 GPS continuously operating stations in Tianjin area as well as 4 IGS reference staions, and the timespace correlations of zenith tropospheric delay at different locations were analyzed. The results show that the mean values of differences among stations are about ±4 mm , the standard errors are better than 1cm; the mean values of differences between the data of 2006 and 2007 are about 9mm , the standard errors are better than 4cm.
2009 Vol. 29 (2): 106-110 [Abstract] ( 3018 ) PDF (2785 KB)   ( 3104 )
111 A NEW METHOD FOR GPS PRECISE EPHEMERIS INTERPOLATION
Chen Peng;Chen Zhengyang;and Li Xiao
The generalized extension interpolation is used to interpolate the IGS precise ephemeris,and the interpolation accuracy and its relation with the three parameters are dicussed.The technique is compared with Lagrange polynomial interpolation and Chebyshev polynomial fitting. The results indicate that the generalized extension interpolation method is with higher accuracy.
2009 Vol. 29 (2): 111-114 [Abstract] ( 2219 ) PDF (1029 KB)   ( 3448 )
115 APPLICATION OF GREY MODEL BASED ON WAVELET ANALYSIS IN DAM SAFETY MONITORING
Jiao Minglian ;and Jiang Tingchen;
Through analyzing the characteristics of wavelet theory and grey model，the grey forecast model based on wavelet analysis is proposed. By the wavelet transform, the deformation sequence is decomposed and then each subsequence is forecasted with grey model. After reconstruction, the forecasted results are obtained. At the same time, the results are compared with that forecasted only by use of grey model. The research shows that the new forecasting method can improve forecast precision.
2009 Vol. 29 (2): 115-117 [Abstract] ( 2225 ) PDF (428 KB)   ( 3067 )
118 APPLICATION OF DYNAMIC ROBUST SUPPORT VECTOR MACHINE TO PREDICTION OF DAM DEFORMATION
Li Xiao ;and Xu Jinjun
In view of the deficiencies of support vector machine(SVM),it has been improved in two aspects.On the one hand,
the paper presents a robust LSSVM model and its accuracy and reliability are verified through the simulation test.On the other hand,with respects of the nature of mathematics of SVM,a new dynamic LSSVM method is proposed.Finally, the dynamic robust LSSVM model is formed based on the combination of the dynamic LSSVM and the robust LSSVM, and applied to the prediction of dam deformation, which has achieved good prediction results.
2009 Vol. 29 (2): 118-120 [Abstract] ( 2222 ) PDF (650 KB)   ( 3166 )
121 PRECISE ORBIT DETERMINATION OF LOW EARTH ORBIT SATELLITE AND GPS SATELLITE BASED ON COMBINEDORBIT DETERMINATION STRATEGY
Kuang Cuilin ;Liu Jingnan ;and Zhao Qile
The combined orbit determination method for low earth orbit satellite and GPS satellite using ground and spacebased GPS tracking data is studied.
Some tests were designed according to different number and distribution of ground GPS tracking stations and implemented by use of PANDA (Positioning And Navigation Data Analysis) software. Numerical results
show that better orbit precision with the method can be obtained as compared to “twostep orbit determination method”, because this method profits from the low earth orbit satellite which has greatly enhanced the spatial measurement geometry.
2009 Vol. 29 (2): 121-125 [Abstract] ( 2207 ) PDF (2168 KB)   ( 4145 )
126 CONTRASTIVE ANALYSIS OF COMMON COMPUTING METHODSOF ULTRAHIGH DEGREE AND ORDER FULLY NORMALIZED ASSOCIATED LEGENDRE FUNCTION
Wang Jianqiang ;Zhao Guoqiang ;and Zhu Guangbin
The numerical stability of the construction and application of the ultrahigh degree and order earth’s gravity model lies on the computing methods of the ultrahigh degree and order normalized associated legendre functions (ALFs). Four computing methods of ALFs including standard forward column method, standard forward row method, Belikov column method and recursive method between every other order and degree, are discussed and their calculation programs are improvied. Advantages and disadvantages of these methods are analyzed and compared in two aspects: numerical efficiency and numerical accuracy, when the degree and order are up to 3 060. Numerical tests prove that recursive method between every other order and degree is excellent.
2009 Vol. 29 (2): 126-130 [Abstract] ( 2230 ) PDF (1634 KB)   ( 4055 )
131 REGULARIZED TOTAL LEAST-SQUARES SOLUTION TO ILL-POSED ERROR-IN-VARIABLE MODEL
Yuan Zhenchao ;Shen Yunzhong;and Zhou Zebo
Total leastsquares method is preferrable to estimate the parameters in the linear observation models when both the observaion and designed matrix are contaminated by random errors. However, the conventional total leastsquares solution cannot deal with the illposed problems, so the regularization algorithm must be used in this case. The formulas of regularized total leastsquares solution based on Tikhonov regularization criterion are derived and the variancecovariance matrices of the estimated parameters are computed by numerical method. Finally, a simulated example is investigated to verify the regularized total least squares solution by use of the Fredholm integration equation of the first kind. The result shows that the accuracy of estimates is significantly improved with this regularized algorithm.
2009 Vol. 29 (2): 131-135 [Abstract] ( 2262 ) PDF (1432 KB)   ( 3597 )
135 REALIZATION AND MAINTENANCE OF TERRESTRIAL REFERENCE FRAME
Wei Na;and Shi Chuang
The paper gives the definition of ideal ITRF (International Terrestrial Reference Frame). Taking ITRF, WGS84 and so on for example, the realization and maintenance of ITRF are introduced and then the relationships and differences among them are induced. The combination principle of ITRF and the realication method for ITRF2005 which is the latest version of ITRF are introduced.
2009 Vol. 29 (2): 135-139 [Abstract] ( 2769 ) PDF (411 KB)   ( 3679 )
140 ZERO-DIFFERENCE KINEMATIC PRECISE ORBITDETERMINATION OF LOW EARTH ORBIT SATELLITE
Wang Wei ;Wang Haihong;Luo Jia;and Zhong Bo;
The approaches to precise orbit determination (POD) for satellites in Low Earth Orbit (LEO) were sumed up, and the theory,
the steps and the factor influencing the accuracy of zerodifference kinematic POD were analyzed. Futhermore, by comparing the zerodifference kinematic orbit determination with doubledifference kinematic, zerodifference reduceddynamic and doubledifference reduceddynamic orbit determination it is found that with this method not only the accuracy close to that with other three methods can be attained, but also it is simple for computing.
2009 Vol. 29 (2): 140-142 [Abstract] ( 1966 ) PDF (1042 KB)   ( 3416 )
观测技术
143 DESIGN OF A NEW DIGITAL PHASE TRANSFER CIRCUIT
Li Ying;Li Shude;Du Ruilin;Zhao Fenghua;and Xia Jiening
By use of inverter,counter,trigger and some other simple chips, a kind of digital phase transfer circuit was designed.
The range of phase angle which can be transfered is from 0° to 360°. In the same time, the digital phase transfer circuit was tested and analyzed with a crystal oscillator circuit after frequency division. The results show that this phase transfer circuit is stable and reliable, the accuracy can reach to 2.8°.
2009 Vol. 29 (2): 143-145 [Abstract] ( 1852 ) PDF (1635 KB)   ( 4610 )
146 DESIGN OF AUTOMATICALLY ZEROING DEVICE OF DZW-TYPE GRAVIMETER
Wu Pengfei;Hu Guoqing;and Du Ruilin
The mechanical structure and circuits of a new type of automatic zeroing device are designed, which can make the precision of DZW-type gravimeters’ zero conrol reach to 40×10 -8 ms-2 .The design not only accelerates the zeroing operation but also avoids excess and lack of adjustment as well. Moreover, the device can fulfill automatic zero by distant control.
2009 Vol. 29 (2): 146-148 [Abstract] ( 2952 ) PDF (2195 KB)   ( 3162 )
149 APPLICATION OF VEHICLEBORNE DATA ACQUISITION SYSTEM TO POWER LINE DETECTION
Ou Tonggeng;Geng Xuexian ;and Yang Boxiong;
An advanced vehicleborne laser data acquisition system is introduced, which uses the vehicleborne laser scanner to scan the power line, and get the parameters of the spatial distribution of power line by use of the data obtained with the leastsquare fitting algorithm.
2009 Vol. 29 (2): 149-151 [Abstract] ( 2158 ) PDF (1351 KB)   ( 3251 )
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