高动态多普勒对多音调频信号性能影响研究

发布时间：2018-01-11 20:33

本文关键词：高动态多普勒对多音调频信号性能影响研究　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：现如今,航天测控在军事、政治、科技和人们的生活中被广泛应用,安全遥控是其中尤为重要的一环,它关系着地面人员、建筑物的安全以及航天员逃逸。美国靶场的安全遥控系统普遍采用多音组合调频的主字母体制,因其实时性强、可靠性高、安全保密性好等诸多优点,可充分满足安全遥控任务的要求,成为国内外研究热点。由于火箭、导弹等飞行器从发射、入轨到回收是一种高速高动态的飞行场景,导致接收端的测控信号存在不可避免的多普勒频率偏移,对正确解调产生影响。有效的多普勒频移估计和补偿可以消除频偏,提高了安控系统的性能。本文对采用多音组合调频的安全遥控体制进行了系统的研究,所取得的主要研究成果为:1.系统的研究了采用多音组合调频的主字母体制,推导了这种体制的漏指令概率、虚指令概率、误指令概率等性能指标,结合调制过程和解调过程分析了该体制的实时性、可靠性和安全保密性。并将其和国内传统的PCM-PSK-FM安全遥控体制进行各方面比较和性能评估,分析表明,采用多音组合调频的主字母体制在安全遥控特殊的任务背景下独具优势。2.利用主字母通信体制的基本原理和关键技术构建了发射机仿真模型和接收机仿真模型,研究了高斯白噪声信道下该体制的误符号率,并进行MATLAB仿真。3.介绍了多普勒频移产生的原因以及其对接收信号的影响,介绍了多普勒频移补偿技术的发展历程和研究现状。文中模拟了两种低动态多普勒频移和一种高动态多普勒频移,研究了这三种情况下主字母体制对多普勒频移的抵抗能力。为进一步提高系统性能,将锁相环嵌入到接收机中,用于对普勒频移的估计和后续信号处理中的补偿,消除了多普勒频移带来的影响,提高了主字母体制性能。4.采用GUI设计了采用多音组合调频的安全遥控用户界面。
[Abstract]:Nowadays, space TT & C is widely used in military, politics, science and technology and people's life. The safety of buildings and the escape of astronauts. The safety remote control system of American shooting range generally adopts the master letter system of multi-tone combination frequency modulation, because of its many advantages such as high real-time, high reliability, good security and so on. It can fully meet the requirements of the safe remote control mission, and has become a research hotspot at home and abroad. Because of the rocket, missile and other aircraft from launch, orbit to recovery is a high speed and high dynamic flight scene. As a result, the Doppler frequency offset of the receiver is inevitable, which has an impact on the correct demodulation. Effective Doppler shift estimation and compensation can eliminate the frequency offset. The performance of safety control system is improved. In this paper, the security remote control system with multi-tone combination frequency modulation is studied systematically. The main research results are as follows: 1. The main alphabet system using multi-tone combination frequency modulation is studied systematically, and the performance indexes of this system, such as the probability of missing instruction, the probability of virtual instruction and the probability of false instruction, are deduced. Combining the modulation process and demodulation process, the real-time, reliability and security confidentiality of the system are analyzed, and the comparison and performance evaluation between the system and the traditional PCM-PSK-FM security remote control system are carried out. Analysis shows. The master letter system with multi-tone combination frequency modulation has its own advantage under the background of the special task of secure remote control. 2. The transmitter simulation model and receiver simulation mode are constructed by using the basic principle and key technology of the master letter communication system. Type. In this paper, the symbol error rate in Gao Si white noise channel is studied, and the MATLAB simulation. 3. The causes of Doppler frequency shift and its influence on the received signal are introduced. The development and research status of Doppler shift compensation technology are introduced. Two kinds of low dynamic Doppler frequency shift and one high dynamic Doppler frequency shift are simulated in this paper. In order to further improve the performance of the system, the PLL is embedded into the receiver. It is used to estimate the Doppler shift and compensate for the subsequent signal processing to eliminate the influence of Doppler shift. The performance of the main alphabet system is improved. A secure remote control user interface using multi-tone combination frequency modulation is designed by using GUI.
【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】：2014
【分类号】：TN911.3

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