宽带电磁环境监测系统关键技术研究

发布时间：2018-07-13 10:40

【摘要】：随着电子技术的发展，宽带信号已经被越来越广泛地应用于雷达、电子对抗以及无线通信等军用和民用设备领域，致使战场和日常的电磁环境越来越恶劣。一方面，恶劣的电磁环境可能导致军用设备性能降低甚至根本无法工作；另一方面，在此情况下，国家对于频谱资源的管理面临日益严峻的考验。宽带电磁环境监测是对真实电磁环境中的宽带信号进行采集、处理、记录、回放和分析，在武器性能验证和频谱资源管理等应用领域发挥着越来越重要的作用。本文将针对宽带电磁环境监测系统中的关键技术进行研究，具体内容如下：为了提高采样率，本文首先介绍了时域并行采集理论，并且对时域并行采集引入的干扰进行了理论推导与仿真，提出了干扰的优化方法并且验证了系统优化后的效果。接着本文对于监测中实时信号处理部分的并行滤波数字下变频技术和频谱监测技术进行了论述，，提出了基于高速FIR并行滤波数字下变频方法和基于频谱矢量累和的监测方法，解决了信号实时处理的问题。然后本文阐述了监测信号的时域、频域、码域和调制域参数，并且重点对信号调制域参数特征分析方法进行了研究，提出了基于奇异值分解滤波的快速小波脊分析方法，经仿真该方法在信噪比恶劣的环境下，提高了常用脉内调制方式的识别率。为验证宽带电磁环境监测系统的研究效果，基于已有构架构建宽带电磁环境监测系统。系统可以2.4GHz采集频率进行高速采集，带宽达到1GHz，同时能实时稳定监测信号频谱，并且在信噪比低于0dB情况下，具有较高的信号调制特征识别率，验证了宽带电磁环境监测技术研究成果，并已实际应用。
[Abstract]:With the development of electronic technology, broadband signals have been used more and more widely in the military and civil equipment fields such as radar, electronic countermeasures and wireless communication. The battlefield and the daily electromagnetic environment are becoming worse and worse. On the one hand, the bad electromagnetic environment may cause the performance of military equipment to be reduced or even can not work at all; the other side can not work at all. In this case, the country is facing an increasingly severe test of the management of spectrum resources. Broadband electromagnetic environment monitoring is the acquisition, processing, recording, playback and analysis of the broadband signal in the real electromagnetic environment. It plays a more and more important role in the application fields such as weapon performance verification and spectrum resource management. The key technologies in the electromagnetic environment monitoring system are studied. The details are as follows:
In order to improve the sampling rate, this paper first introduces the time domain parallel acquisition theory, and gives a theoretical deduction and Simulation of the interference in the time domain parallel acquisition. The optimization method of the interference is proposed and the effect after the system optimization is verified. Then, the parallel filter digital down conversion technology for the real-time signal processing part of the monitoring is presented. The method of digital down conversion based on high speed FIR parallel filtering and monitoring method based on spectrum vector sum are proposed. The problem of real-time signal processing is solved. Then the time domain, frequency domain, code domain and modulation domain parameter of the monitoring signal are expounded, and the characteristic analysis of the signal modulation domain is focused on. The method is studied and a fast wavelet ridge analysis method based on singular value decomposition filter is proposed. The simulation method improves the recognition rate of the commonly used intra pulse modulation in the environment of bad SNR.
In order to verify the research effect of the wideband electromagnetic environment monitoring system, a broadband electromagnetic environment monitoring system is built based on the existing frame. The system can collect the frequency of 2.4GHz for high-speed acquisition, the bandwidth is 1GHz, and the signal spectrum can be monitored in real time, and the recognition rate of signal modulation characteristics is higher when the signal to noise ratio is lower than 0dB. It has proved the research results of broadband electromagnetic environment monitoring technology and has been applied in practice.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP274;TN911.7

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