Meng Yao, Zhong Xing, Liu Yong, Zhang Kun, Ma Chi
Appl Opt. 2021 Jan 20;60(3):697-704. doi: 10.1364/AO.411134.
The micro-nano design of a high-precision star sensor is studied. Point source transmittance (PST, the ratio of the irradiance generated by the external field source on the image surface to the irradiance at the entrance pupil) is used as the evaluation index of stray light suppression ability, the stray light suppression theory of star sensors is analyzed, and the mathematical model between stray light suppression ability and detectable magnitude is established. In view of the limited volume of micro-nano star sensors, a new design principle of combined anti-stray-light design of the baffle and optical system is proposed. The high stray light suppression of the micro-nano star sensor is realized by using the imaging optical path design of active stray light suppression and the design of a conical extinction cavity, which breaks through the technical problem of coupling system volume and stray light suppression ability. The results of the simulation and on-orbit experiments show that the star sensor based on the joint stray light technology can achieve a PST of 2×10 at the avoidance angle under the premise of limited optical system volume, and it has a stray light suppression ability of 6.5 magnitude stars.
研究了一种高精度星敏感器的微纳设计。采用点源透过率（PST，即外场源在像面上产生的辐照度与入瞳处辐照度之比）作为杂散光抑制能力的评价指标，分析了星敏感器的杂散光抑制理论，并建立了杂散光抑制能力与可探测星等之间的数学模型。针对微纳星敏感器体积受限的问题，提出了一种遮光罩与光学系统组合式抗杂散光设计的新原理。通过采用主动杂散光抑制的成像光路设计和锥形消光腔设计，实现了微纳星敏感器的高杂散光抑制，突破了耦合系统体积与杂散光抑制能力的技术难题。仿真和在轨实验结果表明，基于联合杂散光技术的星敏感器在光学系统体积受限的前提下，在避开角处可实现2×-10的PST，具有6.5星等的杂散光抑制能力。 （注：原文中“2×10”表述似乎有误，推测可能是“2×10^-10”之类，这里按推测翻译）
