Evaluation Method for Stargazing Accuracy during Astronomical Positioning of Star Sensors Assisted by Inertial Navigation
In order to solve the problem of selecting high-precision observation stars from multiple stars as navigation star points in the astronomical positioning of inertial navigation-aided star sensors,a stargazing accuracy evaluation method based on object image conjugation based on point light source was proposed.In this method,the star vector successfully recognized by the star sensor is converted into a horizon coordinate system parallel to each axis of the star sensor,and the stargazing accuracy is evaluated by calculating the values of the acute angles between the object vector and the image vector of the star recognition.After the accuracy evaluation,the observation star with high accuracy is used as the navigation star and applied to the astronomical positioning of the inertial-assisted star sensor.The results of field data processing show that the proposed method can effectively select navigation stars with high accuracy,and the positioning results of the selected navigation stars are higher than those obtained by astronomical positioning before selection,and the data variance and standard deviation are 1 to 3 orders of magnitude lower.
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