本文選題：GNSS　切入點(diǎn)：廣播電離層模型　出處：《長(zhǎng)安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：廣播電離層模型是削弱電離層延遲誤差的重要手段,是單頻接收機(jī)提高導(dǎo)航、定位精度的有效途徑。GNSS(包括GPS/BDS/Galileo)通過(guò)向用戶發(fā)播電離層參數(shù)實(shí)現(xiàn)電離層延遲修正,同時(shí)GNSS系統(tǒng)通過(guò)不斷完善監(jiān)測(cè)網(wǎng)與處理策略優(yōu)化和發(fā)展其全球廣播電離層模型。隨著GNSS應(yīng)用日益廣泛,各系統(tǒng)之間的兼容與互操作也相繼開展。因此,在統(tǒng)一標(biāo)準(zhǔn)下開展衛(wèi)星導(dǎo)航系統(tǒng)性能評(píng)估十分必要,其中,廣播電離層精度監(jiān)測(cè)評(píng)估是一項(xiàng)主要內(nèi)容。為及時(shí)、準(zhǔn)確地評(píng)估廣播電離層精度需選擇精度更高、可靠性更強(qiáng)的電離層評(píng)估基準(zhǔn)以及適當(dāng)?shù)脑u(píng)估方法。目前,主要采用IGS(CODE)電離層格網(wǎng)(GIM)作為GNSS廣播電離層精度評(píng)估的基準(zhǔn),然而考慮到CODE模型在我國(guó)區(qū)域內(nèi)布站的不足,本文開展了基于改進(jìn)CODE模型電離層格網(wǎng)評(píng)估,以及基于基準(zhǔn)站實(shí)測(cè)電離層評(píng)估等方法的研究,并對(duì)GNSS廣播電離層精度監(jiān)測(cè)評(píng)估展開試驗(yàn)。主要研究?jī)?nèi)容與成果概括如下:(1)詳細(xì)闡述了GNSS電離層建模及評(píng)估的基本理論,分析了電離層延遲誤差的影響,給出了GNSS電離層延遲改正的模型與方法。(2)開展了以CODE GIM為基準(zhǔn)的廣播電離層精度的監(jiān)測(cè)評(píng)估,分析了GPS/BDS/Galileo廣播電離層模型改正精度。(3)顧及CODE模型在我國(guó)境內(nèi)布站的不足,提出改進(jìn)CODE模型(亦稱CODE+模型)電離層格網(wǎng)評(píng)估法,通過(guò)增加國(guó)內(nèi)監(jiān)測(cè)站數(shù)據(jù),提高了我國(guó)及周邊地區(qū)的電離層建模精度,在此基礎(chǔ)上開展了GPS/BDS/Galileo廣播電離層精度監(jiān)測(cè)評(píng)估試驗(yàn)。(4)基于實(shí)測(cè)數(shù)據(jù)建立的全球電離層基準(zhǔn),以基準(zhǔn)站實(shí)測(cè)站星視線上電離層延遲為參考,實(shí)現(xiàn)了基于基準(zhǔn)站實(shí)測(cè)電離層的GNSS廣播電離層精度評(píng)估。(5)比較了基于CODE GIM、改進(jìn)CODE模型GIM,以及基準(zhǔn)站實(shí)測(cè)電離層評(píng)估三種GNSS廣播電離層精度監(jiān)測(cè)評(píng)估的優(yōu)缺點(diǎn)。通過(guò)試驗(yàn)分析,結(jié)果表明三種方法評(píng)估結(jié)論一致,中國(guó)及周邊區(qū)域BDS廣播電離層模型精度高于GPS與Galileo,改正率平均75%左右,GPS模型精度最差;Klobuchar模型中、高緯度精度高于低緯度,表現(xiàn)出電離層明顯的緯度相關(guān)特性。
[Abstract]:Broadcast ionospheric model is an important means to weaken the ionospheric delay error, and it is an effective way for single-frequency receiver to improve navigation and positioning accuracy. GNSS (including GPS / BDS / Galileo) realizes ionospheric delay correction by broadcasting ionospheric parameters to users. At the same time, the GNSS system optimizes and develops its global broadcast ionospheric model by continuously improving the monitoring network and processing strategy. With the increasing application of GNSS, the compatibility and interoperability among the various systems are carried out one after another. It is necessary to carry out the performance evaluation of satellite navigation system under the unified standard, in which the monitoring and evaluation of broadcast ionospheric accuracy is a main content. In order to evaluate the broadcast ionospheric accuracy in a timely and accurate manner, it is necessary to select a higher accuracy. Ionospheric evaluation datum with higher reliability and appropriate evaluation methods. At present, the ionization grid (GIMM) is mainly used as the benchmark for the accuracy evaluation of the GNSS broadcast ionosphere. However, considering the shortage of the CODE model in the regional distribution of stations in our country, In this paper, the methods of ionospheric grid evaluation based on the improved CODE model and the ionospheric evaluation based on the reference station are studied. The main research contents and results are summarized as follows: (1) the basic theory of GNSS ionospheric modeling and evaluation is described in detail, and the influence of ionospheric delay error is analyzed. The model and method of GNSS ionospheric delay correction are given. The monitoring and evaluation of broadcast ionospheric accuracy based on CODE GIM are carried out. The correction accuracy of GPS/BDS/Galileo broadcast ionospheric model is analyzed. An improved CODE model (also called CODE model) is proposed to evaluate the ionospheric grid. The accuracy of ionospheric modeling in China and its surrounding areas is improved by increasing the data of monitoring stations in China. On this basis, the GPS/BDS/Galileo broadcast ionospheric accuracy monitoring and evaluation test. 4) the global ionospheric datum is established based on the measured data, and the ionospheric delay at the satellite line of sight of the reference station is taken as the reference. The accuracy evaluation of GNSS broadcast ionosphere based on the measured ionosphere at the reference station is realized. The advantages and disadvantages of the three kinds of GNSS broadcast ionospheric accuracy monitoring and evaluation are compared based on the CODE Gims, the improved CODE model and the base station ionospheric evaluation. The results show that the accuracy of BDS broadcast ionospheric model in China and its surrounding regions is higher than that of GPS and Galileo, and the average correction rate is about 75%. In Klobuchar model, the accuracy of high latitude is higher than that of low latitude. The ionospheric latitudinal correlation is evident.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P228.4

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 歐明;張紅波;劉鈍;甄衛(wèi)民;;NeQuick電離層修正模型中國(guó)區(qū)域適用性初步分析[A];第三屆中國(guó)衛(wèi)星導(dǎo)航學(xué)術(shù)年會(huì)電子文集——S05衛(wèi)星導(dǎo)航增強(qiáng)與完好性監(jiān)測(cè)[C];2012年

，

本文編號(hào)：1588980