【作者】 孙颖；

【导师】 廖桂生；

【作者基本信息】 西安电子科技大学 ， 信号与信息处理， 2011， 硕士

【摘要】 随着合成孔径雷达(SAR)在军事领域和民用领域中得到广泛的应用,对地面运动目标的检测和定位有着更迫切的需求,而对运动目标定位的关键在于对其进行参数估计,径向速度则是一个重要的参数。本文主要研究了地面快速运动目标的径向速度的解模糊方法。本文首先对合成孔径雷达系统中静止目标回波模型和运动目标回波模型进行了分析,并分析了目标的运动对雷达回波和成像结果的影响。其次对于快速运动目标造成的径向速度模糊问题,论述了一种基于两视数据估计动目标不模糊径向速度的方法,并作了详细的计算机仿真。最后论述了一种估计地面运动目标多普勒模糊数方法,由于运动目标的多普勒模糊数与其斜距历程中的线性项有关,我们可以通过对运动目标信号进行距离徙动校正来估计其多普勒模糊数。仿真结果表明这种方法可以准确地估计出多普勒模糊数。更多还原

【Abstract】 Synthetic Aperture Radar (SAR) has been widely used in many military and civilian applications. With the increasing requirement in military and civilian areas, it is highly desirable to detect moving targets and relocate them. The key procedure of target relocation is the parameter estimation. Cross-track velocity is a very important parameter. This dissertation deals with the resolution of Doppler ambiguity of cross-track velocity of grounding fast moving target estimation.We first analyze the model of stationary target echoes and that of moving target, and discuss the effect of moving target on the echoes and the SAR image. Then aiming to cross-track velocity ambiguity caused by fast moving of the grounding target, we discuss a algorithm based on two-looking data to estimate the unambiguous cross-track velocity and give analysis of the experimental results. Finally a Doppler ambiguity number estimate algorithm is discussed. Because of the relation between the slant range and the Doppler ambiguity number of the grounding moving target, we can estimate the Doppler ambiguity number by correcting the range cell migration. Experimental results show that the ambiguity number of the cross-track velocity can be accurately estimated.更多还原