【作者】 黄勇；

【导师】 郝莉；

【作者基本信息】 西南交通大学 ， 通信与信息系统， 2007， 硕士

【摘要】 通信侦察和抗干扰技术是通信对抗的重要组成部分，通信侦察是为侦察和识别敌方通信信号的技术参数、工作特点和所在位置，探明敌方通信网的组成、用途而采取的措施。通信抗干扰是消除或削弱敌方通信干扰的危害，保障已方通信系统、设备正常发挥效能的措施。本文通过分析通信侦察的基本原理，对通信侦察中的载波频率测量、信号带宽测量、调制模式识别进行了算法研究，并借助信号处理技术，采用合理的算法，在DSP器件上进行处理。使用快速傅立叶变换(FFT)实现对多个信号的载波频率和信号带宽的测量，通过基于决策理论的识别算法实现了对多个信号调制模式的识别。结果表明，通过MATLAB仿真的载波频率测量、信号带宽测量和调制模式识别算法能有效地移植到DSP器件上执行。在通信抗干扰方面，本文分别介绍了OFDM技术和跳频通信技术，并结合通信对抗中广泛使用的干扰技术，分别对OFDM信号和跳频通信信号在干扰中的性能进行了分析。首先分析OFDM系统在部分频带干扰和多音干扰下的性能，提出子载波跳频OFDM的概念，然后分析子载波跳频OFDM在部分频带干扰和多音干扰下的性能，通过比较发现，子载波跳频OFDM在部分频带干扰和多音干扰下的性能明显优于OFDM的性能。更多还原

【Abstract】 Reconnaissance and Anti-jamming for communication is an important component of communication counter-Measures. The purpose of reconnaissance is to take a variety of measures to detect and identify the technical parameters, characteristics and locations of enemy’s communication signals, the functions and components of enemy’s communications network. The purpose of Anti-jamming is to eliminate or weaken the hazards of enemy’s jam for communication, protect equipments and functioning of our communication systems.This dissertation researches the algorithm of carrier frequency measurement, signal bandwidth measurement and modulation scheme recognition by analyzing basic principle of reconnaissance for communication. Furthermore, the algorithm is implemented on Digital Signal Processor (DSP) using signal processing technology. Fast Fourier Transform (FFT) is applied to achieve multi-signal carrier frequency measurement and bandwidth measurement, and decision-theoretic approach is applied to achieve modulation scheme recognition. The test result demonstrates that the simulation algorithm achieved on MATLAB can be effectively transplanted to DSP.On Anti-jamming, this dissertation discusses the OFDM technologies and frequency-hopping communication technologies, and simulates the performance of OFDM signal and frequency-hopping signal respectively associated with widely used jamming techniques in communication counter-Measures, such as partial-band jamming, multitone jamming and so on. Firstly, the anti-jamming performances of OFDM under partial-band jamming and multitone jamming are analyzed. Then Subcarrier-Hopping OFDM is proposed. Moreover, the anti-jamming performances of Subcarrier-hopping OFDM in same jamming conditions are also analyzed. By comparison with OFDM, it demonstrates that the anti-jamming performance of Subcarrier-hopping OFDM is better than that of OFDM in both environments.更多还原