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測(cè)繪工程畢業(yè)設(shè)計(jì)外文翻譯-其他專業(yè)(編輯修改稿)

2025-02-24 03:49 本頁(yè)面
 

【文章內(nèi)容簡(jiǎn)介】 vailability in the field of the related theoretic research and engineering application. The experimental results show that the model can indicate the characteristic of ionospheric actions, improves further the modeling ability of local ionosphere and may be used to correct efficiently ionospheric delay of the single frequency GPS uses serviced by DGPS. (2) Different calculating schemes are designed which are used to analyze in detail the characteristics of the effect from instrumental bias (IB) in GPS observations on determining ionospheric delays. IB is different from noise in GPS observations. The experimental results show that the effect of IB is much larger than that of the noise on estimating ionospheic delay, and IB can cause ionospheric delay measurements to include systematic errors of the order of several meters. Therefore, one must significantly take notice of IB and remove its negative effect, and should not casually consider IB as part of noise whenever GPS data are used to fit ionospheric model or to directly calculate ionospheric delay. (3) Stability of IB is studied with a refined method for separating it from ionospheric delay using multiday GPS phasesmoothed code data. The experimental results show that, by using averaging of noise with phasesmoothed code observation, the effect of noise on separating IB from ION can be efficiently reduced, and satellite bias plus receiver bias are relatively stable and may be used to predict the IBs of the next session or even that of the next several days. (4) A new algorithm about static real time determination of ionospheric delay is presented on the basis of the predicted values of IB and the technique of real time averaging of noise and weightedadjustment of dual Pcode and carrier phase measurements. The preliminary results show that the new method, which is by postprocessing phasesmoothed code data to calculate the IB and then with them to predict and to correct the IB of data needed to remove its effects in real time in the next observation periods, has relatively better accuracy and effectiveness in estimating ionospheric delay. It is very obvious that the scheme can relatively decrease the number of unknown parameters, can efficiently reduce the main negative effect from instrumental bias, and can be easily used to directly and precisely determine ionospheric delay with dualfrequency GPS data. Hence, the method may be considered as an available scheme to determine ionospheric delays for WAAS and many other large range GPS application systems. 2 A method of constructing large range (regional and global) highprecision grid ionospheric model─—the Different Area for Different Stations (DADS) and its application in China Based on the systematic and further research of the principle and methods of establishing grid ionospheric model (GIM), a new method of establishing a GIM Different Areas for Different Stations (DADS) is investigated which is advantageous for considering the local characters of ionosphere, avoiding the effects of the geometrical construction of GPS reference work on estimating the external precision of the GIM, and improving the precision of calculating model parameters. The above results are used to make a preliminary estimation of the latent precision that can be obtained by establishing a large range high precision grid ionospheric model based on the Chinese crust movement observation work, and to investigate the possibility that the GIM provides highprecision ionospheric correction, and to identify the relevant problems which need to be solved for the planned GPS Wide area Augmentation System (WAAS) of China. 3 A method of efficiently correcting ionospheric
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