MLAT系统定位算法研究及实现

发布时间：2017-12-27 04:29

本文关键词：MLAT系统定位算法研究及实现　出处：《中国民航大学》2017年硕士论文　论文类型：学位论文

【摘要】：多点定位(Multilateration,MLAT)是一种用于场面监视的被动定位技术,具有覆盖灵活、容量大、抗干扰性强、定位精确度高、便于实现等特点。因此MLAT系统成为该领域的研究热点。应答信号到达时间(Time of Arrival,TOA)检测是MLAT系统实现定位功能的前提和基础,对于MLAT系统的研究具有重要意义。本文在研究MLAT系统定位算法的基础上,重点研究TOA检测方法,分析TOA测量精确度对MLAT系统定位性能的影响。本文的主要研究工作包括:从固定位置、移动目标两个方面分析了测距误差对Chan算法和Taylor算法定位性能的影响,并分析了基站数量对这两种算法定位性能的影响。在研究了差分匹配滤波器法TOA测量原理的基础上,针对传统差分匹配滤波器法存在的缺陷,本文提出了基于二次判决的差分匹配滤波器法和基于二次零点检测与判决的差分匹配滤波器法。仿真分析了不同信噪比情况下算法的性能,结果显示改进算法的TOA测量精确度要远远高于原始算法。并通过理论和仿真分析了信号采样频率对TOA测量精确度的影响。从信号噪声及信号采样频率两个角度,分析了TOA测量精确度对MLAT系统定位性能的影响。为了实现在计算机中模拟电磁波空间传输的过程,提出了基于圆锥体构型的电磁波传输模型。通过数学推导和实验仿真分析,证明了基于圆锥体构型的电磁波传输模型可以模拟实现电磁波空间传输的过程,进而实现MLAT系统的定位功能。
[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.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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