【摘要】：DORIS技術(shù)以其全天候、周期短、數(shù)據(jù)多等優(yōu)點成為國內(nèi)外衛(wèi)星導航定位領(lǐng)域的研究開發(fā)的熱點。本文以DORIS系統(tǒng)為基礎(chǔ),采用動力學定軌和批處理算法,研究了衛(wèi)星相位中心偏差、對流層延遲、重力場模型等因素對定軌精度的影響程度,并利用DORIS數(shù)據(jù)基于平均距離變化率的測量模型實現(xiàn)了 ERP參數(shù)的解算。本文的主要研究內(nèi)容及所得結(jié)論如下:(1)衛(wèi)星相位中心偏差對定軌精度的影響將利用DORIS數(shù)據(jù)中的修正值進行相位中心偏差修正和使用固定矢量模型進行相位中心偏差修正兩種方案獲得的定軌結(jié)果進行比較,結(jié)果表明:利用所得數(shù)據(jù)中的修正值進行相位中心偏差修正,獲得的定軌精度要優(yōu)于使用固定矢量模型進行相位中心偏差修正的定軌精度。因此在使用DORIS2.0格式數(shù)據(jù)進行精密定軌時,可優(yōu)先選擇使用數(shù)據(jù)中提供的修正值進行衛(wèi)星相位中心修正。(2)重力場模型對DORIS定軌精度的影響主要分析了 JGM-3、GGM02C、EGM96、EGM-2008、EIGEN-GL04C 和ITUGRACE-16重力場模型在展開到40、50、60、70、80和90階次的情況下對于Jason-2衛(wèi)星的定軌結(jié)果。結(jié)果表明:在相同的展開階次下,采用ITUGRACE-16重力場模型所獲得的定軌精度最好;在同一重力場模型的不同展開階次中,上述幾種重力場模型對于JASON-2衛(wèi)星的定軌精度在50階次達到最好。(3)對流層延遲修正對定軌精度的影響對比分析了利用數(shù)據(jù)中的對流層延遲修正值和使用Saastamoinen大氣模型改正對流層延遲的定軌精度,結(jié)果表明:利用數(shù)據(jù)中的對流層折射修正值進行對流層延遲修正所得到的定軌結(jié)果較差,而利用Saastamoinen模型進行對流層修正結(jié)果則滿足海洋測高衛(wèi)星定軌精度的需求,因此在利用DORIS技術(shù)進行精密定軌時,推薦使用相應(yīng)的對流層模型進行對流層延遲修正。(4) ERP參數(shù)的解算以平均距離變化率觀測方程為基礎(chǔ),以解算ERP參數(shù)的理論模型為依據(jù),基于動力學定軌原理與批處理算法,編寫了 ERP參數(shù)解算軟件,實現(xiàn)了利用DORIS數(shù)據(jù)解算ERP參數(shù)。為了驗證定軌過程中軌道精度和ERP參數(shù)解算精度的關(guān)系,采用優(yōu)化后的定軌方案分別利用DORIS 2.0和DORIS 3.0格式數(shù)據(jù)進行了 ERP參數(shù)的解算。結(jié)果表明,定軌精度與ERP參數(shù)解算精度成正比關(guān)系,要提高ERP參數(shù)的解算精度可以從選擇更加優(yōu)化的定軌策略入手。
[Abstract]:DORIS technology has become a hot spot in the research and development of satellite navigation and positioning field at home and abroad for its advantages of all-weather, short period and many data. Based on DORIS system, the influence of satellite phase center deviation, tropospheric delay and gravity field model on orbit determination accuracy is studied by using dynamic orbit determination and batch processing algorithm. The calculation of ERP parameters is realized by using the measurement model based on the average distance change rate of DORIS data. The main research contents and conclusions are as follows: (1) the effect of satellite phase center deviation on orbit determination accuracy will be corrected by using the correction value in DORIS data and by using the fixed vector model. The orbit determination results obtained by the two schemes are compared. The results show that the accuracy of orbit determination is better than that of using the fixed vector model to correct the phase center deviation. Therefore, in the use of DORIS2.0 format data for precise orbit determination, the satellite phase center correction can be made by using the correction value provided in the data first. (2) the influence of gravity field model on the precision of DORIS orbit determination is mainly analyzed in this paper. (2) the influence of gravity field model on the precision of DORIS orbit determination is mainly analyzed. The orbit determination results of EGM-2008,EIGEN-GL04C and ITUGRACE-16 gravity field models for Jason-2 satellites under the conditions that the gravity field models are developed to the order of 40,50,60,7080 and 90th order. The results show that the orbit determination accuracy obtained by using ITUGRACE-16 gravity field model is the best under the same expansion order. In the different expansion order of the model of the same gravity field, Several gravity field models mentioned above have the best orbit determination accuracy for JASON-2 satellites in 50 orders. (3) the effect of tropospheric delay correction on orbit determination accuracy is analyzed and compared with the tropospheric delay correction values and the use of the tropospheric delay correction values in the data. The Saastamoinen atmospheric model corrects the orbit determination accuracy of tropospheric delay. The results show that the results of tropospheric delay correction based on the tropospheric refraction correction in the data are poor, while the tropospheric correction by using Saastamoinen model can meet the requirements of the orbit determination accuracy of marine altimetry satellites. Therefore, it is recommended to use the corresponding tropospheric model for tropospheric delay correction when using DORIS technique for precise orbit determination. (4) the solution of ERP parameters is based on the observation equation of average distance change rate. Based on the theoretical model of solving ERP parameters, based on the principle of dynamic orbit determination and batch processing algorithm, a software for solving ERP parameters is developed, which realizes the calculation of ERP parameters by using DORIS data. In order to verify the relationship between orbit accuracy and ERP parameter resolution in orbit determination process, the optimized orbit determination scheme is used to calculate ERP parameters using DORIS 2.0 and DORIS 3.0 format data, respectively. The results show that the orbit determination accuracy is proportional to the precision of ERP parameter solution. To improve the accuracy of ERP parameter determination, we can choose a more optimized orbit determination strategy.
【學位授予單位】：山東科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P228

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