本文關(guān)鍵詞：衛(wèi)星導(dǎo)航新體制信號的抗多徑環(huán)路跟蹤技術(shù)研究　出處：《北京理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 新體制信號 多徑干擾 碼跟蹤環(huán)路 MEDLL算法

【摘要】：為實現(xiàn)頻譜共享和提升系統(tǒng)性能，各國都先后提出了衛(wèi)星導(dǎo)航系統(tǒng)的現(xiàn)代化方案。BOC調(diào)制作為一種新的信號調(diào)制方式，在現(xiàn)代化方案中被多個國家的衛(wèi)星導(dǎo)航系統(tǒng)廣泛使用，從而產(chǎn)生了BOC信號及它新的變種信號。這些信號在給系統(tǒng)帶來一系列性能提升的同時，也對信號的抗多徑算法能夠達到的抗多徑性能提出了更高的要求。本課題研究目的是設(shè)計實現(xiàn)新體制衛(wèi)星導(dǎo)航信號的抗多徑環(huán)路跟蹤技術(shù)，得出一種最適合新體制信號的抗多徑算法。 本文首先對新體制信號的調(diào)制方式進行了介紹，從信號的產(chǎn)生方式、自相關(guān)函數(shù)和功率譜密度三個方面作了研究；又簡單介紹了BOC調(diào)制信號的跟蹤算法，給出了幾種典型的針對新體制衛(wèi)星導(dǎo)航信號的跟蹤算法；接著本文對多徑現(xiàn)象的特征進行了分析，通過對多徑模型的研究，明確了多徑干擾對延遲鎖定環(huán)路和載波跟蹤環(huán)的影響。 本文重點論述了三種基于碼跟蹤環(huán)的抗多徑技術(shù)（窄相關(guān)、Double-Delta和MEDLL）的原理，并比較了它們的抗多徑性能。并在MATLAB上仿真實現(xiàn)了三種算法，通過對三種算法多徑誤差包絡(luò)圖的分析和研究，，得出在碼跟蹤環(huán)路上增加相關(guān)器的個數(shù)，可有效提高直達信號時延估計精度，但同時會降低處理速度，所以需在成本與精度之間折中選擇。同時，通過比較三種抗多徑技術(shù)，說明MEDLL算法有更好的抗多徑性能，能基本消除多徑產(chǎn)生的碼跟蹤誤差。 最后，本文詳細介紹了MEDLL算法流程圖，分析了MEDLL算法如何估計多徑參數(shù)（相位估計、時延估計、幅度估計）及進行循環(huán)迭代。給出了新體制信號中抗多徑MEDLL算法的軟件實現(xiàn)框圖。
[Abstract]:In order to realize spectrum sharing and improve the system performance, every country has put forward the scheme of modern satellite navigation system.BOC modulation is a new modulation method, is widely used in satellite navigation system in a number of countries in the modernization program, resulting in a new variant of BOC signal and its signal. These signals in a boost a series of performance at the same time to the system, but also put forward higher requirements to the anti multipath performance of anti multipath signal. This algorithm can achieve the purpose of the research is to design the anti multipath loop tracking technology new system of satellite navigation signals, and presents a new system for the signal of the anti multipath algorithm.
This paper first modulation signal of the new system are introduced, generated from the signal, autocorrelation function and power spectral density are studied in three aspects; and briefly introduces the tracking algorithm of BOC modulated signal, the tracking algorithm is given for several typical new system of satellite navigation signal; then the characteristics of the the multipath phenomenon is analyzed through the research of the multipath model, the effect of multipath interference on the delay locked loop and carrier tracking loop.
This paper focuses on the three kinds of anti multipath technology based on code tracking loop (narrow, Double-Delta and MEDLL) principle, and compared the anti multipath performance of them. And in the MATLAB simulation of the three algorithms, through analysis and Research on three kinds of multipath error envelope algorithm, obtained a number of related device the increase in the code tracking loop, which can effectively improve the direct signal delay estimation accuracy, but also reduces the processing speed, so the need to compromise between cost and accuracy. At the same time, through the comparison of three kinds of anti multipath techniques, MEDLL algorithm has better anti multipath performance, can basically eliminate the code tracking error generated by multipath.
Finally, this paper introduces the flow chart of MEDLL algorithm in detail, and analyzes how to estimate multipath parameters (phase estimation, time delay estimation, amplitude estimation) and cyclic iteration by MEDLL algorithm. It also gives the block diagram of software implementation of anti multipath MEDLL algorithm in new system.

【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN96.1

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本文編號：1419907