Abstract
As an important development direction of star sensor technology, the All-Time star sensor technology can expand the application of star sensors to flight platforms inside the atmosphere. Due to intense atmospheric background radiation during the daytime, the commonly used star sensors operating in the visible wavelength range are significantly limited in their ability to detect stars, and hence the All-Time star sensor technology which is based on the shortwave infrared (SWIR) imaging system has become an effective research direction. All-Time star sensor detection capability is significantly affected by observation conditions and, therefore, an optimized selection of optical parameters, which mainly includes the field of view (FOV) and the detection wavelength band, can effectively improve the detection performance of All-Time star sensors under harsh observation conditions. This paper uses the model simulation method to analyze and optimize the optical parameters under various observation conditions in a high-altitude environment. A main parameter among those discussed is the analysis of detection band optimization based on the SWIR band. Due to the huge cost constraints of high-altitude experiments, we conducted experiments near the ground to verify the effectiveness of the detection band selection and the correctness of the SWIR star sensor detection model, which thereby proved that the optimization of the optical parameters for high altitudes was effective and could be used as a reference.
Highlights
Star sensors are one of the most accurate attitude determination instruments to date, and has been widely used in space platforms [1,2,3]
The optimal detection wavelength band and other optical parameters of the All-Time star sensor under observation environments determined based on this model
The different optimal detection wavelength bandisand other optical parameters of the All-Time star sensor under different observation environments is determined based on this model
Summary
Star sensors are one of the most accurate attitude determination instruments to date, and has been widely used in space platforms [1,2,3]. The strong atmospheric background radiation during the daytime is the major factor hindering the application of All-time star sensors [4,5,6,7]. In order to achieve that goal, it is important and effective to suppress the atmospheric background radiation through optimizing optical design parameters including the detection wavelength band and the FOV. Several research institutions apply spectral filters to filter out the radiant energy of the band below 600 nm based on star sensors operating in the visible wavelength. In order to reduce incident sky background radiation and improve the signal-to-noise ratio (SNR) of stars, the existing All-Time star sensors prefer to adopt a small FOV signal-to-noise ratio (SNR). All-Time star sensor detection is described, and the of factors the model caused the selection of SWIR bandmodel is analyzed.
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