穿墙雷达等效采样接收机关键技术研究
发布时间：2018-12-09 14:02
【摘要】：穿墙雷达(Through-Wall Radar,TWR)能够穿透墙壁等障碍物探测隐蔽目标,广泛应用于反恐、安检和搜救等领域,近年来逐渐成为国内外学者研究的热点。而冲激脉冲雷达(Impulse Radar)具有穿透能力强、距离分辨率高、截获概率低等优点,因此广泛应用在穿墙雷达系统中。对TWR接收机来说,系统接收的信号是超宽带(Ultra Wide-band,UWB)冲激脉冲信号,倘若进行超高速实时采样,成本很高。等效采样能够降低对超宽带信号进行超高速采样的难度,而且成本会大大降低,因此,等效采样技术是TWR接收机的必然选择。本文第二章介绍了穿墙雷达中的等效采样技术。首先介绍了超宽带穿墙雷达系统,主要分析了其信号体制和频率范围。然后对超宽带脉冲波形进行了分析和仿真。最后介绍了等效采样技术的基本理论。本文第三章研究了基于传统结构的等效采样接收机设计。首先分析和研究了取样门电路、取样脉冲产生电路以及精密延时电路这三项关键技术。然后针对穿墙雷达的设计指标,设计并制作了新型的取样脉冲产生电路,同时设计了新型的精密延时电路,实现了幅度较高脉冲宽度极窄的取样脉冲和步进精度高延迟范围大的步进脉冲信号,结果与理论分析相吻合。本文第四章研究了基于单片微波集成电路(Monolithic Microwave Integrated Circuit,MMIC)的新型等效采样接收机设计。首先研究了传统等效采样技术的优化改进措施。然后基于跟踪保持放大器MMIC芯片HMC660LC4B,设计了一种新型的等效采样接收机实现方案,并对其中各个关键模块进行仿真分析与论证,仿真结果与理论分析一致,证明新设计方案的可行性。
[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.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.5
[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.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.5
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