本文關(guān)鍵詞：衛(wèi)星導(dǎo)航信號(hào)聯(lián)合處理技術(shù)研究　出處：《國(guó)防科學(xué)技術(shù)大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 全球衛(wèi)星導(dǎo)航系統(tǒng) 聯(lián)合捕獲 廣義似然比檢驗(yàn) 差分相干檢測(cè) 矢量延遲鎖定環(huán) 奇偶空間 抗差估計(jì) 完好性

【摘要】：隨著衛(wèi)星導(dǎo)航芯片在電子設(shè)備中的廣泛應(yīng)用和全球衛(wèi)星導(dǎo)航系統(tǒng)的蓬勃發(fā)展,衛(wèi)星導(dǎo)航定位在城市峽谷、室內(nèi)和密林等弱信號(hào)環(huán)境下的應(yīng)用需求不斷增加,研發(fā)具有高靈敏度和高可靠性接收機(jī)的任務(wù)更加迫切。本文以利用冗余衛(wèi)星和輔助信息實(shí)現(xiàn)性能提升為背景,在聯(lián)合捕獲、矢量跟蹤、抗差定位以及完好性監(jiān)測(cè)等方面進(jìn)行了探索和研究。(1)與傳統(tǒng)捕獲分別對(duì)單個(gè)衛(wèi)星信號(hào)進(jìn)行時(shí)間和頻率的二維搜索方法不同,聯(lián)合捕獲在接收機(jī)概略位置、速度和時(shí)間(PVT,Position Velocity and Time)等初值附近進(jìn)行搜索,充分利用衛(wèi)星信號(hào)間相關(guān)性和星歷等輔助信息,提高捕獲靈敏度。針對(duì)當(dāng)前聯(lián)合捕獲缺少理論分析的問(wèn)題,詳細(xì)推導(dǎo)了聯(lián)合捕獲的廣義似然比檢測(cè)量及其虛警概率和檢測(cè)概率的解析式,定量分析了時(shí)延和多普勒估計(jì)誤差引起的檢測(cè)損耗,為捕獲門限確定和參數(shù)優(yōu)化提供理論依據(jù)。針對(duì)聯(lián)合捕獲檢測(cè)量計(jì)算復(fù)雜的問(wèn)題,提出了一種簡(jiǎn)化實(shí)現(xiàn)結(jié)構(gòu)和選星算法。仿真結(jié)果表明:聯(lián)合捕獲靈敏度隨著可見(jiàn)衛(wèi)星數(shù)增多而提高;在12顆衛(wèi)星可見(jiàn)和相干積分時(shí)間為1ms的相同條件下,簡(jiǎn)化后的聯(lián)合捕獲比傳統(tǒng)單星捕獲靈敏度提高了7.5d B左右。(2)針對(duì)當(dāng)前播發(fā)的衛(wèi)星導(dǎo)航信號(hào)普遍存在電文調(diào)制情況,提出了一種基于改進(jìn)差分相干的聯(lián)合捕獲算法以及相應(yīng)統(tǒng)計(jì)量的概率密度函數(shù)解析式,有效地解決了電文比特翻轉(zhuǎn)導(dǎo)致的捕獲統(tǒng)計(jì)量峰值與PVT真值不對(duì)應(yīng)的問(wèn)題,為相干積分時(shí)間和差分相干后積累次數(shù)的最優(yōu)參數(shù)設(shè)計(jì)提供理論基礎(chǔ)。提出了一種基于統(tǒng)計(jì)量概率密度函數(shù)解析式的優(yōu)化參數(shù)方法,解決了數(shù)值仿真法在參數(shù)優(yōu)化設(shè)計(jì)中存在的精度和計(jì)算量難以平衡問(wèn)題。此外,通過(guò)搭建GPS(Global Positioning System)模擬射頻信號(hào)采集和處理的實(shí)驗(yàn)平臺(tái),驗(yàn)證了改進(jìn)差分相干的聯(lián)合捕獲算法抑制比特翻轉(zhuǎn)的有效性。(3)圍繞矢量延遲鎖定環(huán)的跟蹤精度和有偏性問(wèn)題展開(kāi)。首先,針對(duì)收斂速度和跟蹤精度難以平衡的問(wèn)題,提出了一種環(huán)路帶寬自適應(yīng)調(diào)節(jié)的矢量延遲鎖定環(huán)改進(jìn)算法。其次,針對(duì)可見(jiàn)衛(wèi)星大于4顆時(shí)收斂點(diǎn)不唯一而出現(xiàn)的跟蹤有偏問(wèn)題,提出了基于奇偶空間投影的偏差檢測(cè)和修正算法,該改進(jìn)算法包含兩種不同的實(shí)現(xiàn)結(jié)構(gòu):一是在傳統(tǒng)矢量延遲鎖定環(huán)結(jié)構(gòu)上通過(guò)增加碼相位殘差投影變量檢測(cè)實(shí)現(xiàn)跟蹤偏差監(jiān)測(cè),二是對(duì)位置域在奇偶空間的投影矢量進(jìn)行自適應(yīng)變維跟蹤。相同仿真場(chǎng)景的數(shù)據(jù)處理結(jié)果表明:在特定的條件下,傳統(tǒng)的矢量跟蹤算法最大碼跟蹤偏差為16.706m,改進(jìn)后最大僅為1m,實(shí)現(xiàn)了近似無(wú)偏的跟蹤;基于變維跟蹤的實(shí)現(xiàn)結(jié)構(gòu)由于采用了環(huán)路帶寬自適應(yīng)調(diào)節(jié)算法,在收斂速度和跟蹤精度的平衡上優(yōu)于殘差監(jiān)測(cè)的實(shí)現(xiàn)結(jié)構(gòu),但實(shí)現(xiàn)結(jié)構(gòu)更加復(fù)雜。(4)針對(duì)傳統(tǒng)定位算法和接收機(jī)自主完好性監(jiān)測(cè)(RAIM,Receiver Autonomous Integrity Monitoring)算法無(wú)法有效抑制多個(gè)偽距粗差的問(wèn)題,提出了基于M-估計(jì)的抗差定位算法和相應(yīng)的抗差自主完好性監(jiān)測(cè)算法,該抗差自主完好性監(jiān)測(cè)算法采用改進(jìn)的保護(hù)級(jí)別來(lái)評(píng)估最壞情況下抗差定位誤差。結(jié)合具體GPS觀測(cè)數(shù)據(jù)的實(shí)驗(yàn)結(jié)果表明:在12顆衛(wèi)星可見(jiàn)情況下,所提出的抗差定位算法有效抑制3顆衛(wèi)星信號(hào)中的粗差;抗差自主完好性監(jiān)測(cè)算法的水平保護(hù)級(jí)別約為傳統(tǒng)RAIM的50%,垂向保護(hù)級(jí)別約為傳統(tǒng)的33%,能夠滿足更加嚴(yán)格的保護(hù)級(jí)別要求。最后,對(duì)論文的研究成果及工程應(yīng)用進(jìn)行了總結(jié),并對(duì)下一步將要開(kāi)展的工作進(jìn)行了展望。論文的部分研究成果已應(yīng)用于高性能接收機(jī)和多體制信號(hào)模擬源等項(xiàng)目的設(shè)計(jì)論證、開(kāi)發(fā)與測(cè)試中。
[Abstract]:With the rapid development of satellite navigation chip in electronic equipment and application of global satellite navigation system, satellite navigation and positioning in the city canyons, forests and other indoor applications in weak signal environment is increasing, development with high sensitivity and high reliability of the receiver task more urgent. In order to achieve performance improvement as the background using redundant satellite and the auxiliary information, tracking vector in the joint acquisition, and has carried on the exploration and study of robust positioning and integrity monitoring etc. (1) with the traditional two-dimensional capture time and frequency respectively for single satellite signals in different search methods, combined capture receiver outline position, velocity and time (PVT, Position Velocity and Time the initial search nearby) etc., make full use of the satellite signal correlation and ephemeris auxiliary information to improve the acquisition sensitivity. In view of the current joint acquisition Lack of theoretical analysis. Detailed derivation of the generalized likelihood ratio test and the analytical formula of detection probability and false alarm probability and capture, quantitative analysis of the time delay and Doppler estimation of detection error caused by the loss, to determine the capture threshold to provide a theoretical basis and parameter optimization. For the joint acquisition of measuring the computational complexity of the problem, put forward to achieve a simplified structure and satellite selection algorithm. Simulation results show that the joint acquisition sensitivity increases with the increase in the number of visible satellites; 12 satellites visible and coherent integration time is 1ms under the same conditions, Jane after joint acquisition than the traditional single star acquisition sensitivity increased 7.5d B. (2) according to the satellite the navigation signal broadcast universal message modulation, we propose a joint acquisition algorithm and the corresponding statistics of the probability density function based on improved differential coherent analysis Type, effectively solve the message bit flip to capture statistics peak value and the true value of PVT should be no problem, and provide a theoretical basis for optimal parameter design for the number of accumulated time coherent integration and differential coherent. After put forward a method of optimizing parameter statistic probability density function analytic formula based on the numerical simulation method to solve parameter optimization of accuracy and computational design are difficult to balance. In addition, by setting up the GPS (Global Positioning System) simulation platform of RF signal acquisition and processing, to verify the validity of the modified differential joint acquisition algorithm to suppress the bit flipping coherent. (3) the vector delay lock loop tracking accuracy and partial problems. Firstly, the convergence speed and tracking accuracy is difficult to balance problems, put forward a kind of vector control loop bandwidth adaptive delay locked loop is improved Method. Secondly, according to the visible satellite more than 4 stars not only caused the convergence point tracking bias problem, put forward the deviation parity space projection detection and correction algorithm based on the improved algorithm includes the realization of two different structures: one is the delay locked loop structure by increasing the code phase tracking variable detection of residual projection the deviation in the traditional vector monitoring, two is adaptive target tracking on the projection vector in the space domain. The parity data processing results of the same simulation scene show that under certain conditions, the traditional vector tracking algorithm the code tracking error is 16.706m, the improved maximum of only 1m, the approximate unbiased tracking; variable dimension tracking structure due to the loop bandwidth adaptive adjustment algorithm based on structure is better than that of residual monitoring in convergence speed and tracking accuracy of the balance, but the realization of node The structure is more complex. (4) the traditional location algorithm and the receiver autonomous integrity monitoring (RAIM, Receiver Autonomous Integrity Monitoring) algorithm can not effectively suppress multiple pseudo error problem, proposed M- estimation robust positioning algorithm and the corresponding robust autonomous integrity monitoring algorithm based on the robust independent intact monitoring algorithm using improved protection level to evaluate the worst-case robust positioning error. Combined with the specific GPS data. The results showed that in the 12 satellite visible case, the proposed robust positioning algorithm can effectively suppress outliers 3 satellite signal; robust autonomous integrity monitoring algorithm level the level of protection is about 50% of the traditional RAIM, the vertical protection level is about the traditional 33%, the level of protection can meet the more stringent requirements. Finally, the research results and engineering application of thesis are summarized, and the The future work will be prospected. Part of the research results have been applied to the design, demonstration, development and testing of high performance receivers and multi system signal simulation sources.

【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】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN967.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李國(guó)重;李建文;李軍正;歸慶明;;基于圓概率誤差的RAIM可用性算法研究[J];武漢大學(xué)學(xué)報(bào)(信息科學(xué)版);2011年04期

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本文編號(hào)：1412126