本文選題：數字接收機 + 數字信道化��； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：雷達偵察接收機截獲雷達信號,對信號進行數字化處理提取其特征參數,然后再進行分選識別和脈內特征分析,最終獲取雷達輻射源位置和基本特征信息。但是現(xiàn)代復雜的電磁環(huán)境,要求雷達偵察接收機不僅能夠處理復雜的寬帶調制雷達信號,而且還能全概率截獲各種信號,多信號同時處理。本課題研究和設計的偵察接收機就是在數字信道化技術基礎上,實現(xiàn)寬帶信號偵收,多信號同時處理,完成輻射源的快速識別和定位。本文主要針對接收機信號預處理部分進行研究和實現(xiàn)。首先,簡要介紹了雷達偵察接收機的研究背景,回顧了數字接收機的發(fā)展歷程,研究和分析了雷達偵察接收機的相關理論,總結了接收機的現(xiàn)狀,設計了一種高效的數字信道化接收機。首先詳細論述了數字接收機的基本概念,著重介紹了數字下變頻和數字信道化的原理,研究和推導了多相濾波的理論和實現(xiàn)結構。然后采用數字信道化取代數字下變頻實現(xiàn)信號的濾波和變頻,設計了數字信道化的多相濾波高效實現(xiàn)方式,并對其進行了深入研究和分析。最終運用MATLAB工具對數字信道化及其多相濾波器組進行設計和仿真,并在FPGA中進行了仿真和實現(xiàn)。其次,是雷達信號基本特征參數的提取和處理,主要包括信號頻率相位差、到達角相位差、到達時間和脈沖寬度等脈沖描述字參數。首先對信道化輸出信號進行處理,并運用坐標旋轉數字計算機算法(CORDIC)對信號進行幅相解調,提取其相位信息,應用于信號頻率相位差和到達角相位差的測量,著重論述了CORDIC算法,并進行了仿真和實現(xiàn)。然后是單一信號相位差和不同信號相位差的計算,單一信號相位差用于計算信號頻率。通過多元天線陣列的不同天線接收相同的信號,輸出不同相位的信號,提取其相位差來計算信號的到達角。與此同時對信道化輸出信號進行門限檢測形成保寬脈沖,以便測量信號的脈沖寬度和到達時間。完成整個基本特征參數的測量,合成脈沖描述字,實現(xiàn)信號的分選與識別,脈內特征分析。最后,簡要介紹整個雷達偵察接收機的原理、設計和實現(xiàn)過程。首先是方案的論證和實現(xiàn),然后是接收機硬件平臺的設計和主要元器件的選取等。隨后是在FPGA中實現(xiàn)雷達偵察接收機信號預處理的整個過程,并對雷達接收機的研究成果和未來發(fā)展進行了概括和總結。
[Abstract]:The radar reconnaissance receiver intercepts the radar signal, digitizes the signal to extract its characteristic parameter, then carries on the sorting identification and the in-pulse characteristic analysis, finally obtains the radar emitter position and the basic characteristic information. But in modern complex electromagnetic environment, radar reconnaissance receiver is required not only to process complex wideband modulated radar signals, but also to intercept all kinds of signals at full probability and process multiple signals at the same time. The reconnaissance receiver studied and designed in this paper is based on the digital channelization technology to realize wideband signal detection and multi-signal processing at the same time to complete the rapid identification and location of emitter. In this paper, the receiver signal preprocessing part is studied and implemented. Firstly, the research background of radar reconnaissance receiver is briefly introduced, the development history of digital receiver is reviewed, the related theory of radar reconnaissance receiver is studied and analyzed, and the present situation of receiver is summarized. An efficient digital channelized receiver is designed. Firstly, the basic concept of digital receiver is discussed in detail, the principle of digital down-conversion and digital channelization is emphatically introduced, and the theory and realization structure of polyphase filter are studied and deduced. Then digital channelization is used instead of digital down-conversion to realize signal filtering and frequency conversion. An efficient digital channelized multiphase filter is designed, and it is deeply studied and analyzed. Finally, the digital channelization and its polyphase filter banks are designed and simulated by using MATLAB tool, and are simulated and implemented in FPGA. Secondly, the basic characteristic parameters of radar signal are extracted and processed, which mainly include signal frequency phase difference, arrival angle phase difference, arrival time and pulse width and other pulse description word parameters. Firstly, the channelized output signal is processed, and the signal is demodulated by the coordinate rotation digital computer algorithm Cordic. The phase information is extracted and applied to the measurement of the signal frequency phase difference and the angle of arrival phase difference. The CORDIC algorithm is discussed, and the simulation and implementation are carried out. Then the single signal phase difference and different signal phase difference are calculated, and the single signal phase difference is used to calculate the signal frequency. The same signal is received by different antennas of the multi-antenna array, the signal with different phases is output, and the phase difference is extracted to calculate the arrival angle of the signal. At the same time, the threshold of channelized output signal is detected to form a width preserving pulse in order to measure the pulse width and arrival time of the signal. The whole basic characteristic parameter is measured, the pulse description word is synthesized, the signal is sorted and recognized, and the in-pulse feature analysis is realized. Finally, the principle, design and implementation of the whole radar reconnaissance receiver are briefly introduced. The first is the demonstration and implementation of the scheme, then the design of the receiver hardware platform and the selection of the main components. Then the whole process of signal preprocessing of radar reconnaissance receiver is realized in FPGA, and the research results and future development of radar receiver are summarized and summarized.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN957.51

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本文編號：1930508