【摘要】：隨著電子技術(shù)的發(fā)展，寬帶信號已經(jīng)被越來越廣泛地應(yīng)用于雷達、電子對抗以及無線通信等軍用和民用設(shè)備領(lǐng)域，致使戰(zhàn)場和日常的電磁環(huán)境越來越惡劣。一方面，惡劣的電磁環(huán)境可能導(dǎo)致軍用設(shè)備性能降低甚至根本無法工作；另一方面，在此情況下，國家對于頻譜資源的管理面臨日益嚴峻的考驗。寬帶電磁環(huán)境監(jiān)測是對真實電磁環(huán)境中的寬帶信號進行采集、處理、記錄、回放和分析，在武器性能驗證和頻譜資源管理等應(yīng)用領(lǐng)域發(fā)揮著越來越重要的作用。本文將針對寬帶電磁環(huán)境監(jiān)測系統(tǒng)中的關(guān)鍵技術(shù)進行研究，具體內(nèi)容如下： 為了提高采樣率，本文首先介紹了時域并行采集理論，并且對時域并行采集引入的干擾進行了理論推導(dǎo)與仿真，提出了干擾的優(yōu)化方法并且驗證了系統(tǒng)優(yōu)化后的效果。接著本文對于監(jiān)測中實時信號處理部分的并行濾波數(shù)字下變頻技術(shù)和頻譜監(jiān)測技術(shù)進行了論述，，提出了基于高速FIR并行濾波數(shù)字下變頻方法和基于頻譜矢量累和的監(jiān)測方法，解決了信號實時處理的問題。然后本文闡述了監(jiān)測信號的時域、頻域、碼域和調(diào)制域參數(shù)，并且重點對信號調(diào)制域參數(shù)特征分析方法進行了研究，提出了基于奇異值分解濾波的快速小波脊分析方法，經(jīng)仿真該方法在信噪比惡劣的環(huán)境下，提高了常用脈內(nèi)調(diào)制方式的識別率。 為驗證寬帶電磁環(huán)境監(jiān)測系統(tǒng)的研究效果，基于已有構(gòu)架構(gòu)建寬帶電磁環(huán)境監(jiān)測系統(tǒng)。系統(tǒng)可以2.4GHz采集頻率進行高速采集，帶寬達到1GHz，同時能實時穩(wěn)定監(jiān)測信號頻譜，并且在信噪比低于0dB情況下，具有較高的信號調(diào)制特征識別率，驗證了寬帶電磁環(huán)境監(jiān)測技術(shù)研究成果，并已實際應(yīng)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.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TP274;TN911.7

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