Analysis on the precision of the correlation tracker in Space Solar Telescope (SST)

Keliang Hu; Yuanyong Deng; Qian Song

doi:10.1117/12.460299

11 February 2003 Analysis about the precision of correlation tracker in space solar telescope (SST)

Keliang Hu, Yuanyong Deng, Qian Song

Proceedings Volume 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics; (2003) https://doi.org/10.1117/12.460299
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The first astronomical space telescope of China, the Space Solar Telescope (SST), of which the main optical telescope's diameter is one meter, is now being built in the National Astronomical Observatories, Chinese Academy of Sciences (NAOC). In order to obtain high precision data of solar magnetic field, long time exposure is required. Therefore, the correlation tracker technology is applied to keep the images stable during the long exposure and to ensure a high spatial resolution. In this paper, we will analyze the accuracy of the correlation tracker of SST by simulating the high-resolution ground-based observations. By our analyses, it is found that at the spatial scale of 0.1", an accuracy of about 0.3-pixel can be achieved when using cross-correlation method together with 25-point parabolic fitting. The result is better than using only cross-correlation method. And after the quantification effect being computed, Our preliminary result shows that it will get similar result by using either higher or lower level quantification. That is, precision acquired by using 16bit quantification cannot reach much higher than by 1bit in the SST/CT.

Citation Download Citation

Keliang Hu, Yuanyong Deng, and Qian Song "Analysis about the precision of correlation tracker in space solar telescope (SST)", Proc. SPIE 4853, Innovative Telescopes and Instrumentation for Solar Astrophysics, (11 February 2003); https://doi.org/10.1117/12.460299

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