动目标超宽带探测信号处理技术

【作者】 杜敏；

【导师】 赵惠昌；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2010， 硕士

【摘要】 超宽带探测系统的信号带宽很宽,具有高距离分辨力,在近程探测、动目标检测、地面穿透雷达和成像等方面得到广泛应用。论文以超宽带探测为线索,围绕动目标超宽带探测系统领域的一些关键技术,如超宽带波形及其调制方式、时域多普勒处理、动目标超宽带探测系统设计与分析和纳秒脉冲发生器的研制等方面展开研究工作。首先介绍并比较分析超宽带信号的波形、调制方式和接收机信号处理方法,讨论了超宽带窄脉冲的产生方法。在此基础上设计了动目标超宽带探测系统,深入分析了该探测系统中各关键环节,重点研究由动目标引起的多普勒时移,根据多普勒时移原理设计多普勒处理单元。然后对动目标超宽带探测系统进行系统仿真,同时提取目标的距离和速度信息。最后设计实现了基于XC95144XL型CPLD芯片的伪随机码产生器和脉冲宽度为纳秒级的超宽带信号发生器。通过以上的研究工作,证明了所设计的动目标超宽探测系统的正确性和可行性。研究结果表明该探测系统能对目标进行精确定距和测速。更多还原

【Abstract】 Ultra-wideband (UWB) detection system has high range resolution because of its extremely broad bandwidth. Thus it has extended applications, including: proximity detection, motion sensor, ground penetrating radar and imaging, etc. Following the main clue of the UWB detection, the key techniques in moving targets UWB detection including waveforms of UWB and their modulation modes, time-domain Doppler processing, moving targets UWB detection system design and analysis, Nanosecond pulse generator develop are researched.Firstly, the waveforms of UWB signal and their modulation modes, signal processing of receiver are introduced and compared. The method for generation of UWB narrow pulse is reviewed. On this basis, the moving target UWB detection system is designed. The key parts of this detection system are analyzed deeply. Doppler time-shift caused by moving target is studied mainly, and the Doppler processing units are designed according to the fundamental of Doppler time-shift. Secondly, the moving target UWB detection system is simulated, which the range and velocity of the target are extracted simultaneously. Lastly, the generator of three nanoseconds pulse modulated by pseudo-random codes is designed and realized based on CPLD of XC95144XL type.According to the above research work, the validity and feasibility of the moving target UWB detection system designed are proved. It demonstrates that precise range finding and velocity measurement can be realized by the detection system designed.更多还原