改正重谱中噪声偏差的正性约束方法和天文高分辨率像复原实验

A Positive Restricition Method to Correct Noise Bais Terms in Bispectrum and the Experiment in Astronomical High Resolution Image Reconstruction

虽然斑纹掩模法能有效地消除大气湍流噪声引起的像质衰变，实现望远镜衍射极限分辨率像复原，但实际的斑纹探测器都不同程度地存在着多种噪声，它们在斑纹图平均功率谱和重谱中产生的偏差将使模和位相的复原受到严重干扰而最终导致像复原的失败。本文讨论了斑纹掩模法像复原中的噪声问题，提出了改正重谱噪声偏差的正性约束方法，报道了对天文目标：双星ＡＤＳ１６８００和三星Ｈｌｄ１７１（ＡＤＳ１６６４８）的高分辨率像复原观测。

Though the image quality degradation caused by atmosphere turbulent noise can be overcomed and the diffraction limited resolution image reconstruction of the telescope can be achieved with the method of speckle masking, there are many kinds of noise in varying degrees in a real speckle detector, which introduce bais terms into the average power spectrum and bispectrum of speckle iamges and distort gravely the recovery of module and phase. The noise problem in image reconstruction observation with the method of speckle masking was discussed and a positive restriction method used to correct the noise bais terms in bispectrum, then a high resolution image reconstruction observation of objects: binary ADS16800 and triple star Hld171 (ADS16648) was reported.