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The deflection effect of starlight transmission in hypersonic conditions

机译：高超声速条件下星光透射的​​偏转效应

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摘要

When starlight navigation method is applied in the hypersonic vehicle, the complex turbulence generated around the window of star sensor causes starlight deflection, thus lead to the centroid offset of navigation star in the star-map imaging. Starting from characteristics of the flow field, the deflection effects of starlight transmission are researched to solve. At first, based on Reynolds average, the model of flow around the window was established to obtain the density distribution that can be divided into mean-time and fluctuation flow field to analyze the whole field. On this basis, the starlight is traced by using the Runge-Kutta method, while taking the principle of refraction, the evaluation index for starlight deflection is derived to characterize the deflection effect of the field. Finally, verify the applicability of the evaluation index through comparative analysis and also study the impact on deflection effect with the follow situations: different installation locations of star sensor, different angles of incident ray, different Mach numbers and wavelengths of starlight. The study provides the predictive information for centroid offset of navigation star in star-map pre processing to improve the efficiency of star-map matching, and also provides the best choice for the work of the star sensor.
机译：在高超声速飞行器中应用星光导航方法时，在恒星传感器窗口周围产生的复杂湍流会引起星光偏转，从而导致星图成像中导航星的质心偏移。从流场特性出发，研究了星光透射的​​偏转效应。首先，基于雷诺平均，建立窗口周围的流动模型，以获得密度分布，该密度分布可分为平均时间流场和波动流场，以分析整个场。在此基础上，采用Runge-Kutta方法对星光进行跟踪，在遵循折射原理的基础上，导出了星光偏转的评价指标，以表征场的偏转效果。最后，通过比较分析验证了评价指标的适用性，并在以下情况下研究了对偏转效果的影响：星型传感器的安装位置不同，入射射线的角度不同，马赫数和星光波长不同。该研究为星图预处理中导航星的质心偏移提供了预测信息，以提高星图匹配的效率，也为星传感器的工作提供了最佳选择。

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