【摘要】：穿墻雷達(Through-Wall Radar,TWR)能夠穿透墻壁等障礙物探測隱蔽目標,廣泛應(yīng)用于反恐、安檢和搜救等領(lǐng)域,近年來逐漸成為國內(nèi)外學(xué)者研究的熱點。而沖激脈沖雷達(Impulse Radar)具有穿透能力強、距離分辨率高、截獲概率低等優(yōu)點,因此廣泛應(yīng)用在穿墻雷達系統(tǒng)中。對TWR接收機來說,系統(tǒng)接收的信號是超寬帶(Ultra Wide-band,UWB)沖激脈沖信號,倘若進行超高速實時采樣,成本很高。等效采樣能夠降低對超寬帶信號進行超高速采樣的難度,而且成本會大大降低,因此,等效采樣技術(shù)是TWR接收機的必然選擇。本文第二章介紹了穿墻雷達中的等效采樣技術(shù)。首先介紹了超寬帶穿墻雷達系統(tǒng),主要分析了其信號體制和頻率范圍。然后對超寬帶脈沖波形進行了分析和仿真。最后介紹了等效采樣技術(shù)的基本理論。本文第三章研究了基于傳統(tǒng)結(jié)構(gòu)的等效采樣接收機設(shè)計。首先分析和研究了取樣門電路、取樣脈沖產(chǎn)生電路以及精密延時電路這三項關(guān)鍵技術(shù)。然后針對穿墻雷達的設(shè)計指標,設(shè)計并制作了新型的取樣脈沖產(chǎn)生電路,同時設(shè)計了新型的精密延時電路,實現(xiàn)了幅度較高脈沖寬度極窄的取樣脈沖和步進精度高延遲范圍大的步進脈沖信號,結(jié)果與理論分析相吻合。本文第四章研究了基于單片微波集成電路(Monolithic Microwave Integrated Circuit,MMIC)的新型等效采樣接收機設(shè)計。首先研究了傳統(tǒng)等效采樣技術(shù)的優(yōu)化改進措施。然后基于跟蹤保持放大器MMIC芯片HMC660LC4B,設(shè)計了一種新型的等效采樣接收機實現(xiàn)方案,并對其中各個關(guān)鍵模塊進行仿真分析與論證,仿真結(jié)果與理論分析一致,證明新設(shè)計方案的可行性。
[Abstract]:Wall penetrating radar (Through-Wall Radar,TWR), which can detect hidden targets through obstacles such as walls, has been widely used in anti-terrorist, security and search and rescue fields. In recent years, it has gradually become a hot research topic of scholars at home and abroad. The impulse pulse radar (Impulse Radar) has the advantages of strong penetration, high range resolution and low probability of interception, so it is widely used in the penetrating wall radar system. For the TWR receiver, the signal received by the system is an ultra-wideband (Ultra Wide-band,UWB) impulse signal. If the ultra-high speed real-time sampling is carried out, the cost is very high. Equivalent sampling can reduce the difficulty of ultra-high speed sampling of UWB signals, and the cost will be greatly reduced. Therefore, equivalent sampling technology is the inevitable choice of TWR receiver. In the second chapter of this paper, the equivalent sampling technique of penetrating wall radar is introduced. The UWB wall-penetrating radar system is first introduced, and its signal system and frequency range are analyzed. Then the UWB pulse waveform is analyzed and simulated. Finally, the basic theory of equivalent sampling technique is introduced. In the third chapter, the design of equivalent sampling receiver based on traditional structure is studied. Firstly, three key technologies, sampling gate circuit, sampling pulse generation circuit and precision delay circuit, are analyzed and studied. Then a new sampling pulse generation circuit and a new precision delay circuit are designed for the design index of the penetrating wall radar. The sampling pulse with high amplitude and narrow pulse width and the step pulse signal with high step precision and high delay range are realized. The results are in agreement with the theoretical analysis. In chapter 4, a novel equivalent sampling receiver based on monolithic microwave integrated circuit (Monolithic Microwave Integrated Circuit,MMIC) is studied. Firstly, the optimization and improvement measures of traditional equivalent sampling technique are studied. Then a new equivalent sampling receiver based on MMIC chip HMC660LC4B, is designed, and the key modules are simulated and demonstrated. The simulation results are consistent with the theoretical analysis. Prove the feasibility of the new design.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.5

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