Abstract
Integrating the advantages of INS (inertial navigation system) and the star sensor, the stellar-inertial navigation system has been used for a wide variety of applications. The star sensor is a high-precision attitude measurement instrument; therefore, determining how to validate its accuracy is critical in guaranteeing its practical precision. The dynamic precision evaluation of the star sensor is more difficult than a static precision evaluation because of dynamic reference values and other impacts. This paper proposes a dynamic precision verification method of star sensor with the aid of inertial navigation device to realize real-time attitude accuracy measurement. Based on the gold-standard reference generated by the star simulator, the altitude and azimuth angle errors of the star sensor are calculated for evaluation criteria. With the goal of diminishing the impacts of factors such as the sensors’ drift and devices, the innovative aspect of this method is to employ static accuracy for comparison. If the dynamic results are as good as the static results, which have accuracy comparable to the single star sensor’s precision, the practical precision of the star sensor is sufficiently high to meet the requirements of the system specification. The experiments demonstrate the feasibility and effectiveness of the proposed method.
Highlights
Many researchers have studied calibration and accuracy verification methods for the single star sensor[19,20,21,22,23]
The stellar-inertial navigation system under investigation includes a star sensor and an inertial measurement unit (IMU) consisting of three ring-laser gyroscopes (RLGs) and three quartz flexible accelerometers (QFAs)
The star sensor is mounted parallel to the body coordinate frame and the optical axis is aligned with the y body axis
Summary
Many researchers have studied calibration and accuracy verification methods for the single star sensor[19,20,21,22,23]. The standard procedure is that the accuracy of the star sensor is tested after the application of various calibration methods; in other words, the verification experiment aims to verify the presented calibration method and demonstrates the accuracy of the star sensor. Various calibration algorithms, both ground-based and on-orbit, have been proposed to estimate the most effective values of the optical parameters of the star camera using least-squares estimation or another fitting method[24,25,26,27]. Regarding the accuracy evaluation method of the star sensor, Sun proposed an accuracy measurement method
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