本文選題：壓縮采樣 + 光子輔助　； 參考：《清華大學》2014年博士論文

【摘要】：眾所周知，與傳統(tǒng)的采樣技術相比，壓縮采樣技術在獲取稀疏信號時具有采樣率低、數(shù)據(jù)量小的優(yōu)勢，在雷達信號感知中得到廣泛的應用。為了進一步有效提高處理頻率和帶寬，基于光子輔助的壓縮采樣技術應運而生。目前，光壓縮采樣技術仍然處于研究的初步階段，在系統(tǒng)的物理實現(xiàn)和性能提升方面都有待深入的探索。本論文圍繞其中四個關鍵問題展開研究。 首先，針對多通道光壓縮采樣技術實現(xiàn)難的問題，論文提出基于光纖色散延時PRBS的多通道壓縮采樣系統(tǒng)方案，通過多路PRBS信號共享PRBS源和電光調(diào)制器，大幅度降低系統(tǒng)復雜度。同時，論文研究系統(tǒng)的信號模型，理論分析采用這種PRBS源時壓縮頻譜的誤差來源�；诖�，首次實現(xiàn)了帶寬為5GHz的8通道光壓縮采樣實驗系統(tǒng)。 然后，為了進一步提高多通道光壓縮采樣的恢復概率，論文提出采用非線性延時的多通道PRBS信號來增強系統(tǒng)壓縮傳感矩陣的隨機性，進而改善矩陣的等距性，并通過大量的隨機樣本仿真來驗證系統(tǒng)傳感矩陣這一特性。同時，實驗實現(xiàn)從4路帶寬為120MHz的壓縮頻譜中有效恢復出0.2-5GHz范圍內(nèi)多個不同頻段信號。另外，為了提高任意的既定頻帶信號恢復性能，論文提出基于可調(diào)延時的多通道PRBS信號的多子帶接收技術，仿真實現(xiàn)從帶寬為信息率的壓縮信號中恢復出任意、既定頻帶的雙子帶信號。 接著，為了突破壓縮采樣帶寬受限于PRBS碼率的一半這一瓶頸，論文提出基于時域間插的多路光PRBS脈沖來提高系統(tǒng)帶寬，同時仿真驗證了超寬帶壓縮采樣系統(tǒng)傳感矩陣的等距性。實驗利用碼率為10.16Gbps的光PRBS脈沖實現(xiàn)了帶寬為20GHz的壓縮采樣。 最后，針對0/1強度的PRBS信號導致光壓縮采樣系統(tǒng)采樣率高、數(shù)據(jù)量大的問題，本文提出基于相位調(diào)制與相干接收來產(chǎn)生RF與±1強度PRBS的混頻信號的解決方案，分析混頻信號誤差的主要來源�；诖�，實驗實現(xiàn)了壓縮比為25:1、帶寬為5GHz的光壓縮采樣系統(tǒng)。
[Abstract]:It is well known that compared with the traditional sampling technique, the compressed sampling technique has the advantages of low sampling rate and small amount of data in the acquisition of sparse signals, so it is widely used in radar signal sensing. In order to further improve the processing frequency and bandwidth, photon-assisted compression sampling technology emerged as the times require. At present, the optical compression sampling technology is still in the preliminary stage of research, and the physical implementation and performance improvement of the system need further exploration. This paper focuses on four key issues. First of all, aiming at the difficulty of multi-channel optical compression sampling technology, this paper proposes a multi-channel compression sampling system based on fiber dispersion delay PRBS. The system complexity is greatly reduced by sharing PRBS source and electro-optic modulator with multi-channel PRBS signals. At the same time, the paper studies the signal model of the system, and theoretically analyzes the error source of the compressed spectrum when the PRBS source is used. Based on this, an 8 channel optical compression sampling system with bandwidth of 5GHz is implemented for the first time. Then, in order to further improve the recovery probability of multi-channel optical compression sampling, a nonlinear time-delay multi-channel PRBS signal is proposed to enhance the randomness of the system compression sensor matrix, and then to improve the isometric property of the matrix. A large number of random samples are simulated to verify the characteristics of the sensor matrix. At the same time, the experimental results show that multiple signals in the range of 0.2-5GHz can be effectively recovered from the compressed spectrum with 4 channels of bandwidth 120MHz. In addition, in order to improve the recovery performance of any given frequency band signal, this paper proposes a multi-channel PRBS signal multi-subband receiving technology based on adjustable delay. The simulation realizes the recovery of arbitrary signal from the compressed signal with bandwidth information rate. A Gemini signal in a given frequency band. Then, in order to break through the bottleneck that the compressed sampling bandwidth is limited to half of the PRBS bit rate, this paper proposes a multi-channel optical PRBS pulse based on interleaved time domain to improve the bandwidth of the system. At the same time, simulation verifies the equidistance of the sensor matrix of UWB compression sampling system. The compression sampling of 20GHz with bandwidth of 20GHz is realized by using optical PRBS pulse with bit rate of 10.16Gbps. Finally, aiming at the problem of high sampling rate and large amount of data in optical compression sampling system caused by 0 / 1 intensity PRBS signal, this paper proposes a solution to produce RF and 鹵1 intensity PRBS mixed signal based on phase modulation and coherent reception. The main source of error of mixing signal is analyzed. Based on this, an optical compression sampling system with compression ratio of 25: 1 and bandwidth of 5GHz is implemented experimentally.
【學位授予單位】：清華大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TN911.7

【參考文獻】

相關期刊論文 前1條

1 李樹濤;魏丹;;壓縮傳感綜述[J];自動化學報;2009年11期

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本文編號：1879296