發(fā)布時(shí)間：2018-05-24 20:53

  本文選題：數(shù)字接收機(jī) + 數(shù)字信道化�。� 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：雷達(dá)偵察接收機(jī)截獲雷達(dá)信號(hào),對(duì)信號(hào)進(jìn)行數(shù)字化處理提取其特征參數(shù),然后再進(jìn)行分選識(shí)別和脈內(nèi)特征分析,最終獲取雷達(dá)輻射源位置和基本特征信息。但是現(xiàn)代復(fù)雜的電磁環(huán)境,要求雷達(dá)偵察接收機(jī)不僅能夠處理復(fù)雜的寬帶調(diào)制雷達(dá)信號(hào),而且還能全概率截獲各種信號(hào),多信號(hào)同時(shí)處理。本課題研究和設(shè)計(jì)的偵察接收機(jī)就是在數(shù)字信道化技術(shù)基礎(chǔ)上,實(shí)現(xiàn)寬帶信號(hào)偵收,多信號(hào)同時(shí)處理,完成輻射源的快速識(shí)別和定位。本文主要針對(duì)接收機(jī)信號(hào)預(yù)處理部分進(jìn)行研究和實(shí)現(xiàn)。首先,簡(jiǎn)要介紹了雷達(dá)偵察接收機(jī)的研究背景,回顧了數(shù)字接收機(jī)的發(fā)展歷程,研究和分析了雷達(dá)偵察接收機(jī)的相關(guān)理論,總結(jié)了接收機(jī)的現(xiàn)狀,設(shè)計(jì)了一種高效的數(shù)字信道化接收機(jī)。首先詳細(xì)論述了數(shù)字接收機(jī)的基本概念,著重介紹了數(shù)字下變頻和數(shù)字信道化的原理,研究和推導(dǎo)了多相濾波的理論和實(shí)現(xiàn)結(jié)構(gòu)。然后采用數(shù)字信道化取代數(shù)字下變頻實(shí)現(xiàn)信號(hào)的濾波和變頻,設(shè)計(jì)了數(shù)字信道化的多相濾波高效實(shí)現(xiàn)方式,并對(duì)其進(jìn)行了深入研究和分析。最終運(yùn)用MATLAB工具對(duì)數(shù)字信道化及其多相濾波器組進(jìn)行設(shè)計(jì)和仿真,并在FPGA中進(jìn)行了仿真和實(shí)現(xiàn)。其次,是雷達(dá)信號(hào)基本特征參數(shù)的提取和處理,主要包括信號(hào)頻率相位差、到達(dá)角相位差、到達(dá)時(shí)間和脈沖寬度等脈沖描述字參數(shù)。首先對(duì)信道化輸出信號(hào)進(jìn)行處理,并運(yùn)用坐標(biāo)旋轉(zhuǎn)數(shù)字計(jì)算機(jī)算法(CORDIC)對(duì)信號(hào)進(jìn)行幅相解調(diào),提取其相位信息,應(yīng)用于信號(hào)頻率相位差和到達(dá)角相位差的測(cè)量,著重論述了CORDIC算法,并進(jìn)行了仿真和實(shí)現(xiàn)。然后是單一信號(hào)相位差和不同信號(hào)相位差的計(jì)算,單一信號(hào)相位差用于計(jì)算信號(hào)頻率。通過(guò)多元天線陣列的不同天線接收相同的信號(hào),輸出不同相位的信號(hào),提取其相位差來(lái)計(jì)算信號(hào)的到達(dá)角。與此同時(shí)對(duì)信道化輸出信號(hào)進(jìn)行門限檢測(cè)形成保寬脈沖,以便測(cè)量信號(hào)的脈沖寬度和到達(dá)時(shí)間。完成整個(gè)基本特征參數(shù)的測(cè)量,合成脈沖描述字,實(shí)現(xiàn)信號(hào)的分選與識(shí)別,脈內(nèi)特征分析。最后,簡(jiǎn)要介紹整個(gè)雷達(dá)偵察接收機(jī)的原理、設(shè)計(jì)和實(shí)現(xiàn)過(guò)程。首先是方案的論證和實(shí)現(xiàn),然后是接收機(jī)硬件平臺(tái)的設(shè)計(jì)和主要元器件的選取等。隨后是在FPGA中實(shí)現(xiàn)雷達(dá)偵察接收機(jī)信號(hào)預(yù)處理的整個(gè)過(guò)程,并對(duì)雷達(dá)接收機(jī)的研究成果和未來(lái)發(fā)展進(jìn)行了概括和總結(jié)。
[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(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN957.51

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 周曉青;李合生;陶榮輝;蔡英武;;數(shù)字測(cè)頻算法研究綜述[J];微型機(jī)與應(yīng)用;2010年07期

相關(guān)碩士學(xué)位論文 前2條

1 朱擁建;寬帶數(shù)字信道化接收機(jī)的設(shè)計(jì)與研制[D];復(fù)旦大學(xué);2012年

2 盧丹;寬帶數(shù)字信道化接收機(jī)技術(shù)研究[D];哈爾濱工業(yè)大學(xué);2012年

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本文編號(hào)：1930508