|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | An improved regularization method to resolve integer ambiguity in rapid positioning using single frequency GPS receivers显示文摘A new approach is employed in GPS rapid positioning using several-epoch single frequency phase data.Firstly, the structure characteristic of the normal matrix in GPS rapid positioning is analyzed. Then, in the light of the characteristic, based on TIKHONOV regularization theorem,a new regularizer is designed to mitigate the ill-condition of the normal matrix. The accurate float ambiguity solutions and their MSEM (Mean Squared Error Matrix) are obtained using several-epoch single frequency phase data. Combined with LAMBDA method, the new approach was used to fix the integer ambiguities correctly and quickly using MSEM instead of the cofactor matrix of the ambiguities. Finally, a baseline over 3 km is taken as an example. The fixed integer ambiguities by the new approach using five epoch single frequency phase data are the same as those fixed by Bernese software using long time data. The success rate of fixing the integer ambiguities is 100 percent using 197 group data.Compared with the traditional methods, the new approach provides better accuracy and efficiency in GPS rapid positioning. So, the new approach has an extensive application outlook in deformation monitoring, pseudokinematic relative positioning, and attitude determination, etc. | OUJikun WANGZhenjie | 2004 | Chinese Science Bulletin2004，49，2： | 26 |
| 2 | A generalized trigonometric series function model for determining ionospheric delay显示文摘A generalized trigonometric series function (GTSF) model, with an adjustable number of parameters, is proposed and analyzed to study ionosphere by using GPS, especially to provide ionospheric delay correction for single frequency GPS users. The preliminary results show that, in comparison with the trigonometric series function (TSF) model and the polynomial (POLY) model, the GTSF model can more precisely describe the ionospheric variation and more efficiently provide the ionospheric correction when GPS data are used to investigate or extract the earth’s ionospheric total electron content. It is also shown that the GTSF model can further improve the precision and accuracy of modeling local ionospheric delays. | YUANYunbin OUJikun | 2004 | Progress in Natural Science:Materials International2004，14，11： | 20 |
| 3 | Positioning accuracy and reliability of GALILEO, integrated GPS-GALILEO system based on single positioning model显示文摘A kind of uniform reliability index suitable for the code and phase observations is presented and used in reliability evaluation of satellite systems. Then, based on 25 stations of Crustal Movement Observation Network of China, satellite visibility, positioning availability and observationreliability of GPS, GALILEO and integrated GPS- GALILEO are calculated and analyzed in detail. Simulation results reveal that the satellite visibility of GALILEO is superior to that of GPS. Given positioning accuracy, horizontal positioning availability of GALILEO is consistent with that of GPS, but its vertical positioning availability is superior to that of GPS. However, the integrated GPS-GALILEO is shown to be superior to each of the single systems in the aspects of positioning accuracy and availability. The reliability of code and phase observationsbased on GALILEO and integrated GPS-GALILEO system is superior to that of GPS both in spatial and temporal domains on the whole. The new reliability index presented is simple to calculate and reflects reliability differences ofdifferent satellite systems. | ZHAOChunmei OUJikun YUANYunbin | 2005 | Chinese Science Bulletin2005，50，12： | 14 |
| 4 | Application of adaptive filtering by selecting the parameter weight factor in precise kinematic GPS positioning显示文摘A new method of adaptive filtering by selecting the parameter weight factor is introduced in this paper. Based on the theoretical analysis and research, this method is firstly used for precise kinematic GPS positioning with single frequency double-differenced (DD) carrier phase observations. Two numerical examples are given to illustrate the feasibility and validity of the method. The preliminary results show that precise positioning results can be obtained by using only the GPS single frequency DD carrier phase measurements for short baselines with the new method. | RENChao OUJikun YUANYunbin | 2005 | Progress in Natural Science:Materials International2005，15，1： | 11 |
| 5 | The diurnal variations, semiannual and winter anomalies of the ionospheric TEC based on GPS data in China显示文摘With the spherical harmonic (SH) function model and the dual frequency GPS P code phase data from the Crustal Movement Observation Network of China (CMONOC) during the period from year 2000 to 2002, time series of total electron content (TEC) in the area of China is calculated. The diurnal variations, semiannual, and winter anomalies of the ionosphere in the area of China are analyzed and discussed, especially according to the results of year 2001. | HUOXingliang YUANYunbin OUJikun WENDebao LUOXiaowen | 2005 | Progress in Natural Science:Materials International2005，15，1： | 6 |
| 6 | Partial continuation model and its application in mitigating systematic errors of double-differenced GPS measurements显示文摘Based on the so-called partial continuation model with exact finite measurements,a new stochastic assessment procedure is introduced.For every satellite pair,the temporal correlation coefficient is estimated using the original double-differenced(DD)GPS measurements.And then,the Durbin-Watson test is applied to test specific hypothesis on the temporal correlation coefficient.Unless the test is not significant with a certain significant level,a data transformation is required.These transformed measurements are free of time correlations.For purpose of illustration,two static GPS baseline data sets are analyzed in detail.The experimental results demonstrate that the proposed procedure can mitigate effectively the impact of systematic errors on DD GPS measurements. | GUOJianfeng OUJikun RENChao | 2005 | Progress in Natural Science:Materials International2005，15，3： | 6 |
| 7 | Ionospheric eclipse factor method (IEFM) for determining the ionospheric delay using GPS data显示文摘By establishing the ionospheric eclipse factor (IEF) λ of the ionospheric pierce point (IPP) and its ionospheric influence factor (IFF) , and combining λ, with t of IPP, a new method of modeling high precision ionospheric delay using GPS data—ionospheric eclipse factor method (IEFM)—is presented in this paper. The IEFM can effectively select the proper ionospheric models to model the total electron content (TEC) with different changes corresponding to annual, seasonal and diurnal variations. Initial experimental results show that the correction precision of ionospheric delay modeled by the IEFM seems to be close to that of using L3 GPS observations to directly correct the corresponding ionospheric delay. | YUANYunbin OUJikun | 2004 | Progress in Natural Science:Materials International2004，14，9： | 3 |
| 8 | Double-Epoch Algorithm in Rapid Positioning Using Single Frequency GPS Receivers显示文摘A new algorithm, called as Double-Epoch Algorithm (DEA) is proposed in GPS rapid positioning using two epoch single frequency phase data in this paper. Firstly, the structure characteristic of the normal matrix in GPS rapid positioning is analyzed. Then, in the light of the characteristic, based on TIKHONOV regularization theorem, a new regularizer is designed to mitigate the ill-condition of the normal matrix. The accurate float ambiguity solutions and their MSEM (Mean Squared Error Matrix) are obtained, using two epoch single frequency phase data. Combined with LAMBDA method, DEA can fix the integer ambiguities correctly and quickly using MSEM instead of the covariance matrix of the ambiguities. Compared with the traditional methods, DEA can improve the efficiency obviously in rapid positioning. So, the new algorithm has an extensive application outlook in deformation monitoring, pseudokinematic relative positioning and attitude determination, etc. | WANGZhenjie OUJikun LIUGenyou RENChao | 2004 | Geo-Spatial Information Science2004，7，4： | 0 |
| 9 | Variation properties of ionospheric eclipse factor and ionospheric influence factor显示文摘 | ZHAOChunmei YUANYunbin OUJikun CHENJinping | 2005 | Progress in Natural Science:Materials International2005，15，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员