一种星载合成孔径雷达数字成像算法

Study of A Spaceborne SAR Digital Imaging Algorithm

提出了一种星载合成孔径雷达数字成像抑制相干斑的算法OMRD(Overlapped Multilook Range-Doppler)算法,该算法基于星载合成孔径雷达成像基本原理和传统的RD算法,通过距离向脉冲压缩,距离徙动校正,方位向合成孔径处理,去除相干斑噪声处理,实现了星载合成孔径雷达的数字成像,降低了相干斑噪声的影响,提高了图像信噪比.对ERS-1星载原始数据进行实验成像,得到了清晰的意大利罗马地区图像.实验结果表明,OMRD算法是一种有效的星载合成孔径雷达成像抑制相干斑的算法.

A new spaceborne SAR （Synthetic Aperture Radar） imaging algorithm, named OMRD （Overlapped Multilook Range-Doppler）, is presented. Based on the echo model, the principles of SAR and the traditional RD （Range-Doppler） algorithm, OMRD is realized by pulse compression in range, migration correction, synthetic aperture processing in azimuth and overlapped multilook. The processing reduces the effect of speckle and improves the signal to noise ratio. After the raw data of ERS-1 （European Remote Sensing-1） was processed by the imaging algorithm, the image of Roma area in Italy was obtained. The results validate the effectiveness of OMRD imaging algorithm in spaceborne SAR.