高速微振动对Ka测控通信体制影响研究

发布时间：2018-02-14 01:39

本文关键词： 高动态微振动多普勒扩频临近空间　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,临近空间通信技术发展迅速。临近空间通信能够为地面和飞行载体提供多项通信业务服务,而针对临近空间超高速飞行器测控通信也成为了重点研究领域之一。临近空间中的飞行载体具有高动态性,导致该环境下的通信情况与其他环境相差很大。在工程实测中发现,飞行器在非黑障区飞行时也会出现短时间的通信闪断现象,且该现象在飞行器的各个航段均有出现。经初步分析,排除雨衰等一些对通信的影响因素后,发现飞行器各类机械转动、飞行器可控件驱动机构工作和空气动力等会诱发飞行器产生一种频率较高的振动,这种振动的幅度约为厘米级,和Ka波段的电磁波波长相近,因此这种振动将导致一定程度的多普勒频移。本文旨在研究飞行器载体局部级别的振动对Ka测控通信系统的同步性能以及误码性能影响,揭示其对测控通信同步捕获跟踪环路的影响机理。主要工作包括:1.对Ka波段扩频测控系统结构和相关技术的基本原理进行阐述;简介多普勒频偏的产生原理、临近空间通信特点和测控通信系统分类。2.分别从捕获阶段和跟踪阶段两个方面,讨论了扩频系统中同步技术。首先介绍了几种同步捕获技术,其中着重对基于FFT的快速捕获算法原理进行了阐述并完成了仿真分析。其次,分别对跟踪同步技术中锁相环、锁频环的主要组成部分进行介绍和性能仿真。3.简介了微动概念,从一般微动建模分析着手,针对微振动进行了物理建模,并进一步完成了振动诱导的多普勒频率建模。利用模型详细分析了振动诱导的多普勒特点。4.在振动多普勒建模的基础上,结合飞行器高速特点,建立两种高动态多普勒效应模型:匀速运动振动多普勒以及加速运动振动多普勒。利用仿真实验模拟Ka波段扩频测控系统在这两种物理模型情况下的通信,分析了扩频测控系统的同步性能以及误码性能。仿真结果证明,高频率的振动多普勒影响了扩频测控系统的跟踪同步性能。
[Abstract]:In recent years, Near-Space Communications Technology has developed rapidly. Near-Space Communications can provide multiple communications services for ground and flight carriers, For the near space super high speed vehicle TT & C communication has also become one of the key research fields. The flight carrier in the near space has a high dynamic property, which leads to a great difference between the communication situation in this environment and other environments. Flying in the non-black barrier area, the aircraft will also have a short communication flash phenomenon, and this phenomenon will occur in all segments of the aircraft. After preliminary analysis, some factors affecting the communication, such as rain decline, are excluded. It is found that various kinds of mechanical rotation of the aircraft, the control of the driving mechanism and the aerodynamic force of the aircraft can induce the aircraft to produce a vibration of higher frequency. The amplitude of the vibration is about centimeter, which is similar to the wavelength of the electromagnetic wave in Ka band. Therefore, this kind of vibration will lead to a certain degree of Doppler frequency shift. This paper aims to study the effects of local vibration of aircraft carrier on synchronization performance and error rate performance of Ka TT & C communication system. The main work includes: 1. Expound the structure of Ka-band spread spectrum measurement and control system and the basic principle of related technology, introduce the generation principle of Doppler frequency offset, The characteristics of near space communication and the classification of TT & C communication system. 2. The synchronization technology in spread spectrum system is discussed from two aspects: acquisition stage and tracking stage. Firstly, several synchronization acquisition techniques are introduced. The principle of fast acquisition algorithm based on FFT is expatiated and simulated. Secondly, the main components of phase-locked loop and frequency-locked loop in tracking synchronization technology are introduced and the performance simulation is given. 3. The concept of micro-motion is introduced briefly. Based on the analysis of general fretting modeling, the physical modeling of microvibration is carried out. Furthermore, the Doppler frequency modeling of vibration induction is completed. The Doppler characteristics of vibration induction are analyzed in detail by using the model. Based on the Doppler vibration modeling, the characteristics of high speed vehicle are combined. Two kinds of high dynamic Doppler effect models are established: uniform moving vibration Doppler and accelerating moving vibration Doppler. The communication of Ka-band spread spectrum measurement and control system under these two physical models is simulated by simulation experiments. The synchronization performance and error rate performance of the spread spectrum measurement and control system are analyzed. The simulation results show that the high frequency vibration Doppler affects the tracking synchronization performance of the spread spectrum measurement and control system.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN914.42

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