Near-field three-dimensional radar synthetic aperture imaging based on stolt interpolation
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摘要: 提出了一种准单站模式雷达以步进频方式工作条件下微波三维全息成像算法,克服了传统成像算法要求远场条件的限制,通过对雷达接收目标回波数据进行合成孔径处理,提高了雷达成像的分辨力以及雷达对目标的探测能力.采用一种新的Stolt插值实现方法,提高插值精度、减少插值的计算时间,通过插值,可以利用快速傅里叶变换来实现目标三维图像的快速重构.给出了实验和模拟目标的三维图像重构结果,表明基于该插值方式的三维图像重构算法可以重构出目标的三维像,实现对目标的探测并具有良好的分辨率.Abstract: A fully 3-D image-reconstruction algorithm that quasi-monostatic mode is used and the transmitting antenna works in step frequency was developed.The algorithm is not restricted by far field as the traditional imaging algorithm. Through synthetic aperture processing for radar data, the resolutions of the image and the detecting ability of radar are improved .A new Stolt interpolation method , which can increase accuracy of interpolation and reduce computation time, was presented. 3-D image of the objects can be achieved through the fast Fourier transform after interpolation. Numerous imaging results from simulations and experiment were presented. These results show that the algorithm for 3-D image-reconstruction based on this interpolation method can produce a microwave 3-D image with high resolutions.
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Key words:
- radar /
- synthetic aperture /
- three-dimensional imaging /
- Stolt interpolation /
- near field
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