宽带高速跳频信号侦察技术研究

发布时间：2018-09-18 21:28

【摘要】：跳频通信可以大幅提高通信的抗截获和抗干扰能力,研究跳频信号的侦察接收具有重要的军事意义。首先,文章分析了跳频通信双发收发原理以及非合作侦察接收机工作流程,阐述了跳频信号的数学表示中对应参数的物理含义。利用时频分析对跳频信号进行分析,在时频聚集性和运算的复杂度上综合考量各种时频分布的性能,从而得出适用于实际需求的最佳时频分布。其次,分析了常见的三种跳频信号侦察接收机,介绍了传统FFT接收机结构,分析和仿真了基于压缩感知的跳频侦察接收机原理和性能。其中针对传统数字信道化在进行实信号分路时出现的信道冗余问题提出了一种新型高效实现方法。再次,文章对复杂电磁环境下的信号的盲检测问题和参数的估计等问题进行了阐述,针对跳频信号的频域稀疏特性,利用数字信道化的结果对信号的起跳时刻进行估计,并对跳周期进行校准。利用跳时估计结果,提出针对跳频信号的噪声基底估计,设计了载频和带宽估计算法,并对各个算法进行性能仿真验证。最后对跳频信号盲解跳接收机进行实现,分析和解决了高速数据采集和传输的不稳定问题。基于运行速度和资源的综合考虑,设计了分时复用的滤波器和FFT结构,并对高速解跳器实现提出了资源优化结构,给出了最终测试结果。
[Abstract]:Frequency hopping communication can greatly improve the ability of anti-interception and anti-jamming. It is of great military significance to study the reconnaissance and reception of frequency-hopping signals. Firstly, this paper analyzes the principle of dual-transceiver in frequency-hopping communication and the work flow of non-cooperative reconnaissance receiver, and expounds the physical meaning of the corresponding parameters in the mathematical representation of frequency-hopping signal. The time-frequency analysis is used to analyze the frequency-hopping signals, and the performance of various time-frequency distributions is synthetically considered in terms of time-frequency aggregation and computational complexity, and the optimal time-frequency distribution suitable for practical requirements is obtained. Secondly, three kinds of frequency-hopping signal reconnaissance receivers are analyzed, the structure of traditional FFT receivers is introduced, and the principle and performance of frequency-hopping reconnaissance receivers based on compressed sensing are analyzed and simulated. In order to solve the problem of channel redundancy caused by traditional digital channelization in real signal splitting, a novel and efficient implementation method is proposed. Thirdly, the problem of blind detection and parameter estimation of signals in complex electromagnetic environment is discussed in this paper. According to the frequency-domain sparse characteristic of frequency-hopping signals, the take-off time of signals is estimated by the result of digital channelization. The jump period is calibrated. Based on the time-hopping estimation results, the noise base estimation of frequency-hopping signals is proposed. Carrier frequency and bandwidth estimation algorithms are designed, and the performance of each algorithm is verified by simulation. Finally, the blind de-hopping receiver of frequency hopping signal is implemented, and the unstable problem of high-speed data acquisition and transmission is analyzed and solved. Based on the comprehensive consideration of running speed and resource, the time-sharing multiplexing filter and FFT structure are designed, and the resource optimization structure for the implementation of high speed de-hopper is proposed, and the final test results are given.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN914.41

【参考文献】