即时／准即时u-v覆盖的光学综合孔径成像分析

Imaging Analysis of Optical Synthetic Aperture System with the Immediate/para-immediate u-v Coverage

介绍了即时/准即时u-v覆盖的光学综合孔径成像技术实时/准实时观测的优点,并以LBT为实例进行了成像分析.对LBT采用快速傅里叶变换、卷积与反卷积算法获得系统的点扩展函数(PSF)与光学传递函数(OTF);探讨了全局传递函数及其对成像效果的影响,说明了即时/准即时u-v覆盖成像特性;用实验仿真的方法验证了全局传递函数在满足准即时u-v覆盖成像的要求情况下能够对天体目标进行较好的图像恢复.

The indispensable information regarding the image reconstruction is derived immediately/paraimmediately by the optical synthetic aperture imaging with the immediate/para-immediate u-v coverage with the samples taking from the space frequency domain. The image of the observed object is obtained. The advantages of the immediate/para-immediate observation using the optical synthetic aperture imaging technology with the immediate/para-immediate u-v coverage are introduced. The analysis of imaging for LBT is proceeded as an example. It deduces the point-spread function and optical transfer function of the LBT system based on the algorithm of the Fast Fourier Transform （FFT）,convolution and deconvolution. It also discusses the global transform function and its influence on the effect of imaging. It explains the imaging properties of the immediate/para-immediate u v coverage. With the means of the experimental simulation, it tests and verifies that the global transform function could restore the image of celestial body under the circumstance which fits the condition Of the imaging of the para-immediate u v coverage.