【摘要】：隨著軍事通信技術的快速發(fā)展,跳頻通信信號趨向于大帶寬、高載波,導致針對其的電子偵察面臨著高采樣率,海量數(shù)據(jù)存儲及處理的壓力,因此傳統(tǒng)的基于奈奎斯特采樣定理的跳頻信號檢測與估計技術面對這類問題時有著很大的缺陷,以現(xiàn)有的器件水平在具體的實現(xiàn)中會很困難或不可實現(xiàn)。壓縮感知(compressed sensing)是一種利用信號稀疏特性而可進行欠采樣觀測的信號處理方式,通過它可以以接近信號攜帶有用信息的采樣頻率完成對寬帶稀疏信號的采樣,相對Nyquist采樣頻率,此時的采樣頻率會遠遠低于它。本文針對跳頻信號大帶寬范圍采樣及數(shù)據(jù)處理的問題,將壓縮感知應用到跳頻信號的檢測與估計技術上,詳細分析了針對非合作寬帶高速跳頻信號的欠采樣處理以及在此基礎上后續(xù)的信號檢測與參數(shù)技術,給出了完整的系統(tǒng)設計方案、原理分析和仿真驗證。本文的主要內(nèi)容有以下幾個方面:(1)以寬帶調(diào)制轉換器為基礎,完成了針對非合作寬帶跳頻信號的欠采樣接收技術研究,分析了跳頻信號的分段稀疏表示,欠采樣系統(tǒng)、重構系統(tǒng),然后在原MWC的基礎上,提出了一種基于帶通采樣模型的寬帶調(diào)制轉換器,其相對原來的基于低通模型的寬帶調(diào)制轉換器,有效地減少了系統(tǒng)中偽隨機碼片序列的符號交替速率,降低了系統(tǒng)實現(xiàn)的難度。最后從通道數(shù)、碼片序列的隨機特性以及重構算法三個方面分析了它們對系統(tǒng)性能的影響。(2)使用系統(tǒng)在欠采樣條件下完成了對跳頻信號的檢測,并且在有定頻干擾信號存在的情況下使用一種子空間投影法抑制住定頻干擾;在欠采樣后重構跳頻信號與非重構跳頻信號兩種情況下,研究了針對跳頻信號的參數(shù)估計技術,為欠采樣后非重構跳頻參數(shù)估計提供了新的研究思路。
[Abstract]:With the rapid development of military communication technology, frequency-hopping communication signals tend to have large bandwidth and high carrier, which leads to the pressure of high sampling rate, mass data storage and processing for electronic reconnaissance. Therefore, the traditional frequency-hopping signal detection and estimation technology based on Nyquist sampling theorem has great defects in the face of this kind of problem, and it will be difficult or impossible to implement in concrete implementation with the existing device level. Compressed sensing (compressed sensing) is a signal processing method which can be used for under-sampling and observation by using the sparse characteristic of signal. It can sample wideband sparse signal at the sampling frequency close to the signal carrying useful information, relative to the sampling frequency of Nyquist. At this point, the sampling frequency will be much lower than it. In order to solve the problem of sampling and data processing of frequency-hopping signals in large bandwidth, the compressed sensing is applied to the detection and estimation of frequency-hopping signals. The under-sampling processing of the non-cooperative broadband high-speed frequency hopping signal and the subsequent signal detection and parameter technology are analyzed in detail. The complete system design scheme, principle analysis and simulation verification are given. The main contents of this paper are as follows: (1) based on the broadband modulation converter, the undersampling and receiving techniques for the non-cooperative broadband frequency-hopping signals are studied, and the piecewise sparse representation and under-sampling systems of the frequency-hopping signals are analyzed. Then, based on the original MWC, a broadband modulation converter based on bandpass sampling model is proposed, which is compared with the original broadband modulation converter based on low-pass model. The symbol alternation rate of pseudorandom sequence in the system is reduced effectively, and the difficulty of system implementation is reduced. Finally, the effects of channel number, random characteristics of code sequence and reconstruction algorithm on the system performance are analyzed. (2) the frequency hopping signal detection is completed under the condition of under-sampling. In the presence of fixed frequency interference signal, a subspace projection method is used to suppress the fixed frequency interference, and the parameter estimation technique for frequency hopping signal is studied in the case of reconstructing frequency hopping signal and non reconfigurable frequency hopping signal after under-sampling. It provides a new research idea for the estimation of non-reconfigurable FH parameters after undersampling.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN911.23

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本文編號：2246091