發(fā)布時(shí)間：2017-12-27 04:29

  本文關(guān)鍵詞：MLAT系統(tǒng)定位算法研究及實(shí)現(xiàn)　出處：《中國(guó)民航大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： MLAT 時(shí)間戳標(biāo)記 TOA測(cè)量 差分匹配濾波器法 定位性能 圓錐體模型

【摘要】：多點(diǎn)定位(Multilateration,MLAT)是一種用于場(chǎng)面監(jiān)視的被動(dòng)定位技術(shù),具有覆蓋靈活、容量大、抗干擾性強(qiáng)、定位精確度高、便于實(shí)現(xiàn)等特點(diǎn)。因此MLAT系統(tǒng)成為該領(lǐng)域的研究熱點(diǎn)。應(yīng)答信號(hào)到達(dá)時(shí)間(Time of Arrival,TOA)檢測(cè)是MLAT系統(tǒng)實(shí)現(xiàn)定位功能的前提和基礎(chǔ),對(duì)于MLAT系統(tǒng)的研究具有重要意義。本文在研究MLAT系統(tǒng)定位算法的基礎(chǔ)上,重點(diǎn)研究TOA檢測(cè)方法,分析TOA測(cè)量精確度對(duì)MLAT系統(tǒng)定位性能的影響。本文的主要研究工作包括:從固定位置、移動(dòng)目標(biāo)兩個(gè)方面分析了測(cè)距誤差對(duì)Chan算法和Taylor算法定位性能的影響,并分析了基站數(shù)量對(duì)這兩種算法定位性能的影響。在研究了差分匹配濾波器法TOA測(cè)量原理的基礎(chǔ)上,針對(duì)傳統(tǒng)差分匹配濾波器法存在的缺陷,本文提出了基于二次判決的差分匹配濾波器法和基于二次零點(diǎn)檢測(cè)與判決的差分匹配濾波器法。仿真分析了不同信噪比情況下算法的性能,結(jié)果顯示改進(jìn)算法的TOA測(cè)量精確度要遠(yuǎn)遠(yuǎn)高于原始算法。并通過(guò)理論和仿真分析了信號(hào)采樣頻率對(duì)TOA測(cè)量精確度的影響。從信號(hào)噪聲及信號(hào)采樣頻率兩個(gè)角度,分析了TOA測(cè)量精確度對(duì)MLAT系統(tǒng)定位性能的影響。為了實(shí)現(xiàn)在計(jì)算機(jī)中模擬電磁波空間傳輸?shù)倪^(guò)程,提出了基于圓錐體構(gòu)型的電磁波傳輸模型。通過(guò)數(shù)學(xué)推導(dǎo)和實(shí)驗(yàn)仿真分析,證明了基于圓錐體構(gòu)型的電磁波傳輸模型可以模擬實(shí)現(xiàn)電磁波空間傳輸?shù)倪^(guò)程,進(jìn)而實(shí)現(xiàn)MLAT系統(tǒng)的定位功能。
[Abstract]:Multilateration (MLAT) is a passive location technology for scene surveillance. It has many advantages, such as flexible coverage, large capacity, strong anti-interference, high location accuracy and easy implementation. Therefore, MLAT system has become a hot research field in this field. The Time of Arrival (TOA) detection is the premise and foundation of the MLAT system to realize the positioning function, and it is of great significance for the research of the MLAT system. Based on the research of MLAT system positioning algorithm, this paper focuses on the research of TOA detection methods, and analyzes the effect of TOA measurement accuracy on the positioning performance of MLAT system. The main research works in this paper include: from the two aspects of fixed location and mobile target, we analyze the influence of ranging error on the location performance of Chan algorithm and Taylor algorithm, and analyze the influence of the number of base stations on the location performance of the two algorithms. On the basis of studying the TOA measurement principle of differential match filter, aiming at the shortcomings of the traditional differential matching filter, a differential match filter method based on two decisions and a differential match filter method based on two zero point detection and decision are proposed in this paper. The performance of the algorithm under different signal to noise ratio is simulated and analyzed. The results show that the TOA measurement accuracy of the improved algorithm is much higher than that of the original algorithm. The influence of the sampling frequency of the signal on the accuracy of TOA measurement is analyzed by theory and simulation. From the two angles of signal noise and signal sampling frequency, the influence of TOA measurement accuracy on the positioning performance of MLAT system is analyzed. In order to realize the process of simulating the space transmission of electromagnetic wave in the computer, an electromagnetic wave transmission model based on the cone configuration is proposed. Through mathematical deduction and experimental simulation analysis, it is proved that the electromagnetic wave transmission model based on cone conformation can simulate the process of electromagnetic wave spatial transmission, and further achieve the positioning function of MLAT system.
【學(xué)位授予單位】：中國(guó)民航大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

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