频谱搬移法的误差和噪声分析

频谱搬移法是一种新型的高分辨率成像技术,文章采用理论推导与数值仿真相结合的方法,对该技术应用于实际时可能遇到的误差和噪声做了讨论。研究发现:在条纹存在移动误差的情况下,还原图像的质量随条纹移动次数增加反而下降,一般条纹移动3次就能达到最好效果,这也是频谱搬移法原理要求的最少次数,因此这种方法的成像效果与成像速度是不矛盾的,而且在移动误差比较大的情况下,图像质量仍能有所改善;另外,其对条纹场噪声要求也不是很高,一般在信噪比15～20dB时就能非常接近无噪声时的理想效果。

Analysis of Error and Noise of Spectrum-shifting

Spectrum shifting method is a new kind of high resolution imaging technology. The influence of the moving error and the field's noise, which may appear in practical application, has been discussed by simulation method combining theoretical derivation. Research shows that it can achieve the best effect with three times of scanning only. In the presence of system error or random error, the quality of processed image will decline along with the increase of scanning times. So the imaging result and velocity are not contradictory in this technology. Furthermore, the quality requirement to stripe field is not strict. Generally, the effect of processed image using noisy stripe field whoes SNR is from 15dB to 20dB is very close to the ideal effect.