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

【摘要】：在現(xiàn)代電子戰(zhàn)中,面臨著日益嚴峻的電磁環(huán)境,在頻段寬、待處理的信號種類多,且處于被動接收工作條件的背景下,雷達偵察數(shù)字接收機對實時信號處理的要求達到了前所未有的高度。而在雷達偵察數(shù)字接收機中,高精度高速ADC采樣器件的速度與當前處理器實時處理能力之間存在嚴重瓶頸,數(shù)字偵察接收機處理數(shù)據(jù)速度增長緩慢已成為限制當今雷達數(shù)字化偵察接收機提高速度的主要因素。本文首先從理論上分析了數(shù)字接收機的基本結(jié)構(gòu),詳細分析了系統(tǒng)構(gòu)成,針對工作原理進行了詳細的闡述,對三種典型數(shù)字接收機進行了簡要性能分析。其次分析了數(shù)字接收系統(tǒng)理論,針對現(xiàn)在接收機結(jié)構(gòu)中后端數(shù)字信號處理速率無法匹配前端高速ADC轉(zhuǎn)換速率的問題,著重分析了多速率處理技術(shù),并且探討了幾種數(shù)字中頻處理技術(shù)。針對典型雷達信號,分析了描述雷達信號的特征參數(shù),并且對單載頻脈沖信號、線性調(diào)頻脈沖信號以及相位編碼脈沖信號進行了介紹。然后分析了幾種典型雷達信號的時頻分析方法,將瞬時自相關(guān)、短時傅里葉變換、WVD分布和小波變換進行比較,分析了各自優(yōu)缺點,并且確定本文使用短時傅里葉變換進行信號準最佳接收處理。詳細分析了短時傅里葉變換,針對滑動點數(shù)對算法性能的影響、算法整體運算量和時域精度分析進行闡述。然后介紹了信號檢測理論與門限閾值分析理論,并對窄帶譜能量頻率估計算法進行了介紹。最后分別對單載頻脈沖信號、線性調(diào)頻脈沖信號以及相位編碼脈沖信號進行了準最佳接收的仿真與分析。依次對理想信號,噪聲信號進行仿真,對噪聲信號進行信噪比分析。對頻率誤差及脈寬誤差分別進行了詳細的信噪比影響對比。
[Abstract]:In modern electronic warfare, it is faced with increasingly severe electromagnetic environment. In the background of wide frequency band, many kinds of signals to be processed, and passive receiving working conditions, The requirement of real-time signal processing in radar reconnaissance digital receiver has reached an unprecedented level. However, in the radar reconnaissance digital receiver, there is a serious bottleneck between the speed of the high precision and high speed ADC sampling device and the real-time processing capability of the current processor. The slow growth of data processing speed of digital reconnaissance receiver has become the main factor limiting the speed of radar digital reconnaissance receiver. In this paper, the basic structure of the digital receiver is analyzed theoretically, the system structure is analyzed in detail, the working principle is described in detail, and the performance of the three typical digital receivers is analyzed briefly. Secondly, the theory of digital receiving system is analyzed. Aiming at the problem that the back-end digital signal processing rate can not match the front-end high-speed ADC conversion rate, the multi-rate processing technology is emphatically analyzed. Several digital intermediate frequency processing techniques are also discussed. For typical radar signal, the characteristic parameters describing radar signal are analyzed, and the single carrier frequency pulse signal, linear frequency modulation pulse signal and phase coded pulse signal are introduced. Then, the time-frequency analysis methods of several typical radar signals are analyzed. The instantaneous autocorrelation, short time Fourier transform (STFT) WVD distribution and wavelet transform are compared, and their advantages and disadvantages are analyzed. And it is determined that the short-time Fourier transform is used for quasi-optimal signal reception. The short time Fourier transform (STFT) is analyzed in detail. The effect of sliding points on the performance of the algorithm is discussed. Then the signal detection theory and threshold analysis theory are introduced, and the narrowband spectrum energy frequency estimation algorithm is introduced. At last, the simulation and analysis of single carrier frequency pulse signal, linear frequency modulation pulse signal and phase coded pulse signal are carried out. The ideal signal and noise signal are simulated in turn, and the signal-to-noise ratio of the noise signal is analyzed. The effects of frequency error and pulse width error on SNR are compared in detail.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.51

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相關(guān)期刊論文 前1條

1 常虹;趙國慶;牛新亮;;高效的寬帶數(shù)字信道化接收機設(shè)計[J];西安電子科技大學(xué)學(xué)報;2010年03期

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本文編號：1924388