本文關(guān)鍵詞：GNSS多系統(tǒng)自主完好性監(jiān)測(cè)與信號(hào)質(zhì)量評(píng)估技術(shù)研究　出處：《國(guó)防科學(xué)技術(shù)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 衛(wèi)星導(dǎo)航系統(tǒng) 完好性 RAIM 多故障 信號(hào)質(zhì)量監(jiān)測(cè)

【摘要】：隨著衛(wèi)星導(dǎo)航技術(shù)的飛速發(fā)展,其應(yīng)用不僅在海、陸、空、天等軍事領(lǐng)域開(kāi)花結(jié)果,同時(shí)也在航空、運(yùn)輸、農(nóng)業(yè)、建筑等諸多民用領(lǐng)域落地生根。隨著導(dǎo)航精度的不斷提高,人們對(duì)導(dǎo)航系統(tǒng)完好性的要求也愈加嚴(yán)格。本文對(duì)此展開(kāi)研究,具體研究?jī)?nèi)容包含如下:第一部分針對(duì)基于識(shí)別門(mén)限的雙星故障識(shí)別算法存在故障抵消識(shí)別率低的問(wèn)題,利用奇偶空間矩陣任意兩個(gè)列向量生成的子空間,通過(guò)判斷無(wú)噪聲條件下奇偶矢量與其在該故障特征空間投影的相關(guān)性來(lái)識(shí)別故障衛(wèi)星。同時(shí),通過(guò)分析雙星故障矢量方向和故障偏差幅值大小,給出了雙星故障條件下的用戶(hù)誤差保護(hù)水平計(jì)算方法。最后對(duì)雙系統(tǒng)下基于故障特征空間的雙星故障識(shí)別算法進(jìn)行了仿真分析,仿真結(jié)果表明,與基于識(shí)別門(mén)限的RAIM算法相比,本文提出的算法故障識(shí)別率能夠從60%提高到90%以上。第二部分針對(duì)ARAIM基本算法中完好性風(fēng)險(xiǎn)平均分配,而現(xiàn)有RAIM算法中針對(duì)完好性風(fēng)險(xiǎn)動(dòng)態(tài)分配理論計(jì)算復(fù)雜的問(wèn)題,通過(guò)給定初值減少計(jì)算迭代次數(shù)得到次優(yōu)解,改善了危險(xiǎn)誤導(dǎo)信息概率動(dòng)態(tài)分配方案。與完好性風(fēng)險(xiǎn)平均分配算法相比,改進(jìn)后的算法能有效降低保護(hù)水平,提高系統(tǒng)可用性,同時(shí)降低了完好性風(fēng)險(xiǎn)最優(yōu)配置理論算法的計(jì)算復(fù)雜度。最后對(duì)ARAIM算法在不同應(yīng)用場(chǎng)合下的可用性進(jìn)行了仿真分析,仿真結(jié)果表明,多系統(tǒng)組合應(yīng)用能有效提高系統(tǒng)完好性性能,BDS+GPS雙系統(tǒng)應(yīng)用下已基本能滿(mǎn)足中國(guó)區(qū)域LPV-200的要求。第三部分針對(duì)導(dǎo)航參數(shù)未知的GNSS離線(xiàn)信號(hào),無(wú)法利用捕獲跟蹤方式估計(jì)信號(hào)參數(shù)實(shí)現(xiàn)對(duì)信號(hào)監(jiān)測(cè)評(píng)估的背景,結(jié)合工程實(shí)踐需求,利用滑動(dòng)相關(guān)和數(shù)據(jù)累加的方法實(shí)現(xiàn)了對(duì)基于窄波束天線(xiàn)的導(dǎo)航信號(hào)參數(shù)估計(jì)。根據(jù)導(dǎo)航信號(hào)自相關(guān)特性,通過(guò)一小段切片數(shù)據(jù)與原始信號(hào)作相關(guān)處理估計(jì)GNSS信號(hào)碼周期、載波多普勒等參數(shù),通過(guò)信號(hào)周期累積平均提高信噪比,進(jìn)一步估計(jì)信號(hào)載波相位、初始碼相位等信號(hào)參數(shù),利用仿真信號(hào)驗(yàn)證了該方法的有效性。最后將該方法引入GNSS在軌信號(hào)質(zhì)量的監(jiān)測(cè)與評(píng)估,搭建導(dǎo)航信號(hào)質(zhì)量監(jiān)測(cè)分析的軟硬件平臺(tái),實(shí)現(xiàn)了對(duì)GNSS實(shí)測(cè)信號(hào)的分析評(píng)估。最后,對(duì)本文的研究成果和工程價(jià)值進(jìn)行了總結(jié),并指出了目前研究工作中還存在的不足以及未來(lái)待完善的部分。本文的研究?jī)?nèi)容對(duì)衛(wèi)星導(dǎo)航系統(tǒng)完好性具有重要指導(dǎo)意義,其研究成果可直接應(yīng)用于在軌衛(wèi)星導(dǎo)航信號(hào)質(zhì)量的監(jiān)測(cè)與評(píng)估。
[Abstract]:With the rapid development of satellite navigation technology, its application not only in the sea, land, air, and other military field, but also in aviation, transportation, agriculture, construction and other fields. With the air plant navigation accuracy continues to improve, people on the navigation system integrity requirements more strict. In this study, specific the research contents include as follows: the first part is the fault offset the low recognition rate to solve the problem of fault detection algorithm based on the recognition threshold, using the parity space matrix of any two column vector subspace generated by judging the correlation, noise free conditions and the fault feature parity vector space projection to identify fault satellites. At the same time, through the analysis of fault detection and fault vector direction deviation amplitude, gives the user error protection level binary fault condition calculation method. At the end of Fault feature space based on binary fault identification algorithm of dual system is simulated. The simulation results show that compared with the RAIM algorithm to identify the threshold based fault identification algorithm is proposed in this paper can rate increased from 60% to more than 90%. The second part of the integrity risk the average distribution of the basic ARAIM algorithm, and the existing RAIM algorithm for integrity risk allocation theory of the computational complexity of the problem, given by the initial reduction of the number of iterations to obtain suboptimal solutions, improve the risk of misleading information dynamic probability distribution scheme. Compared with the average integrity risk allocation algorithm, the improved algorithm can effectively reduce the level of protection, improve system availability, and reduce the calculation of integrity risk the optimal allocation theory of the complexity of the algorithm. Finally the availability of the ARAIM algorithm in different application situations are simulated, the simulation results table The multi system combination can effectively improve the system integrity performance, application of BDS+GPS double system can basically meet the requirements of LPV-200 GNSS. China area for navigation offline signal with unknown parameters in third parts, can not be used to evaluate the acquisition and tracking method to estimate signal monitoring background signal parameters, combined with the engineering practice, using the method of sliding and the related data accumulated for estimation of navigation signal parameters based on narrow beam antenna. According to the navigation signal autocorrelation, estimation of GNSS channel number cycle through a short section data and original signal processing, signal parameters such as carrier Doppler, through the cumulative average cycle to improve the signal-to-noise ratio, further estimation of signal carrier phase, initial code phase signal parameters, verify the validity of the method by using the simulation signal. Finally the method of introducing GNSS on signal quality Monitoring and assessment, setting up the hardware and software platform analysis of signal quality monitoring, the evaluation and analysis of the measured GNSS signal. Finally, this paper summarizes the research results and the value of the project, and points out the deficiencies in current research and future need to be improved. The research content of this paper is an important guiding significance to the satellite navigation system integrity, monitoring and evaluation of the research results can be directly applied to the satellite navigation signal quality.

【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN967.1

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