本文選題：完好性監(jiān)測 + 地基增強系統(tǒng)��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：導(dǎo)航系統(tǒng)的定位精度、連續(xù)性、完好性和可用性等是導(dǎo)航服務(wù)性能中最為核心的幾個指標,日益受到用戶的重視。其中,完好性的性能要求是導(dǎo)航服務(wù)性能指標中最難滿足的一項。為了提高導(dǎo)航系統(tǒng)的性能,在全球?qū)Ш叫l(wèi)星系統(tǒng)中,引入BOC信號調(diào)制方式,提高衛(wèi)星星歷的預(yù)測精度,使用多個頻段的載波信號等。在此背景下,地基增強系統(tǒng)為了確保飛機的精密進場與安全著陸,必然要解決其中許多與傳播信號相關(guān)、與廣播數(shù)據(jù)相關(guān)和與測量數(shù)據(jù)相關(guān)的完好性問題。本文主要對地基增強系統(tǒng)的完好性監(jiān)測關(guān)鍵技術(shù)進行研究,主要內(nèi)容如下:1.本文以飛機精密進場著陸為基礎(chǔ),分析了地基增強系統(tǒng)的整體結(jié)構(gòu),介紹了參考接收機利用載波相位測量值平滑偽碼測量值的計算方法和數(shù)據(jù)處理中心差分計算誤差修正量的方法,重點介紹了完好性監(jiān)測算法以及執(zhí)行監(jiān)測(EXM)處理監(jiān)測算法中所產(chǎn)生的報警標識的邏輯過程。2.針對SV19號衛(wèi)星所出現(xiàn)的二階階躍信號異常模型導(dǎo)致定位精度下降的事件,本文將事件中的BPSK調(diào)制信號畸變模型擴展到BOC調(diào)制信號中,分別對BOC信號的數(shù)字畸變和模擬畸變模型進行分析研究,從時域和頻域上得出BOC調(diào)制信號的數(shù)字畸變模型相關(guān)函數(shù),從頻域上得出模擬畸變模型相關(guān)函數(shù)。根據(jù)BOC信號相關(guān)峰對稱性的特點設(shè)計出利用多對相關(guān)器對來對BOC調(diào)制信號的模擬畸變模型進行監(jiān)測,提出利用直線擬合的方法對數(shù)字畸變模型進行監(jiān)測。3.無論是突變的電離層風(fēng)暴還是漸變的電離層斜坡模型對飛機的精密進場與安全著陸都有較大的影響,本文針對Shewhart監(jiān)測算法不能監(jiān)測較小的變化以及CUSUM監(jiān)測算法不能一步監(jiān)測較大變化的缺點,將Shewhart-CUSUM組合監(jiān)測算法對電離層風(fēng)暴進行監(jiān)測,并利用實際參考接收機的電離層數(shù)據(jù)對組合算法的性能進行驗證。4.針對衛(wèi)星所廣播的導(dǎo)航電文數(shù)據(jù)中可能存在的較大誤差,通過利用新-舊星歷比較檢測法和歷書-星歷比較檢測法來對新播發(fā)的衛(wèi)星星歷的有效性進行檢測。根據(jù)多個月的正常衛(wèi)星星歷和歷書數(shù)據(jù)計算出衛(wèi)星位置,利用SPSS軟件統(tǒng)計出推導(dǎo)2小時新-舊星歷的衛(wèi)星位置差和推導(dǎo)10小時歷書-星歷的衛(wèi)星位置差,得出當前的新-舊星歷比較檢測法和歷書-星歷比較檢測法的門限值。
[Abstract]:The positioning accuracy, continuity, completeness and availability of navigation system are the most important indexes in the performance of navigation service, which are paid more and more attention to by users. Among them, the performance requirement of integrity is the most difficult to satisfy the performance index of navigation service. In order to improve the performance of navigation system BOC signal modulation is introduced to improve the prediction accuracy of satellite ephemeris and carrier signals of multiple frequency bands are used in GNSS. In this context, in order to ensure the precise approach and safe landing of the aircraft, the ground-based enhancement system must solve many of the problems related to the propagation signal, the broadcast data and the measurement data. In this paper, the key technologies of the integrity monitoring of the foundation strengthening system are studied, the main contents are as follows: 1. Based on the precision approach landing of aircraft, the whole structure of the ground strengthening system is analyzed in this paper. This paper introduces the calculation method of the reference receiver using carrier phase measurement value to smooth the pseudo code measurement value and the method of difference calculation error correction in the data processing center. This paper mainly introduces the completion monitoring algorithm and the logical process. 2. 2. In this paper, the BPSK modulation signal distortion model in SV19 satellite is extended to the BOC modulation signal. The digital distortion model and analog distortion model of BOC signal are analyzed and studied respectively. The correlation function of digital distortion model of BOC modulation signal is obtained from time domain and frequency domain, and the correlation function of analog distortion model is obtained from frequency domain. According to the characteristic of correlation peak symmetry of BOC signal, a multi-pair correlator pair is designed to monitor the analog distortion model of BOC modulation signal, and the method of line fitting is proposed to monitor the digital distortion model. Whether it is a sudden ionospheric storm or a gradual ionospheric slope model, it has a great influence on the precise approach and safe landing of the aircraft. Aiming at the shortcoming that Shewhart monitoring algorithm can not monitor small changes and CUSUM monitoring algorithm can not monitor large changes in one step, the Shewhart-CUSUM combined monitoring algorithm is used to monitor ionospheric storms. The performance of the combined algorithm is verified by the ionospheric data of the actual reference receiver. In view of the possible errors in the satellite broadcast navigation message data, the validity of the newly transmitted satellite ephemeris is tested by using the new and old ephemeris comparison detection method and the almanac ephemeris comparison detection method. According to the normal satellite ephemeris and almanac data for many months, the satellite position is calculated, and the satellite position difference between the new and the old ephemeris for 2 hours and the satellite position difference for 10 hours for the new and old ephemeris are calculated by using the SPSS software. The threshold values of the new-old ephemeris comparison detection method and the ephemeris-ephemeris comparison detection method are obtained.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN967.1

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本文編號：2016045