Research of Methods to Improve the Accuracy of the Star Sensor for Global Navigation Satellite System Technology
Abstract
Star sensors are commonly used in satellite navigation systems to determine the orientation of spacecraft, which is crucial for accurate navigation and control. One of the key factors influencing the performance of a star sensor is its accuracy. However, this accuracy can be impacted by several factors, such as noise, stray light, optical aberrations, and errors during calibration. The article explores various methods to enhance the accuracy of star sensors and examines the image quality requirements necessary for Global Navigation Satellite System (GNSS) applications. Additionally, a software tool was chosen to support the analysis. Different design options for the star sensor's optical system were evaluated, including the parameters of the optical components of the lens and the characteristics of the optical radiation receiver, all of which play a role in determining the sensor’s accuracy. The functionality of these components was also considered. Furthermore, the article investigates strategies for improving the sensor's accuracy. As a result of these investigations, a model of the optical system for the star sensor was developed. The OSLO software was used to model and analyze the star sensor’s optical system in detail.