In recent years,exoplanet detection has become the technological frontier in the field of astronomy,because it provides evidence of the origin of life and the future human habitable *** several satellites to form an a...
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In recent years,exoplanet detection has become the technological frontier in the field of astronomy,because it provides evidence of the origin of life and the future human habitable *** several satellites to form an aperture-synthetic interferometer system in space may help discover"another Earth"via interferometry and midinfrared broadband *** paper analyzes a space-based exoplanet exploration mission in terms of the scientific background,mission profile,trajectory design,and orbital ***,the system architecture and working principle of the interferometer system are briefly ***,the mission orbit and corresponding transfer trajectories are *** halo orbit near the Sun-Earth L2(SEL2)orbit is chosen as the candidate mission *** low-energy transfer via stable invariant manifold with multiple perigees is designed,and the proper launch windows are presented.A speed increment less than 10 m/s is imposed for each transfer to achieve the insertion of the halo ***,the tangent targeting method(TTM)is applied for high-precision formation maintenance with the whole velocity increments of less than 5×10-4 m/s for each spacecraft when the error bound is 0.1 *** overall fuel budget during the mission period is evaluated and *** design in this paper will provide technical support and reliable reference for future exoplanet exploration missions.
In order to address the challenges encountered in visual navigation for asteroid landing using traditional point features, such as significant recognition and extraction errors, low computational efficiency, and limit...
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In order to address the challenges encountered in visual navigation for asteroid landing using traditional point features, such as significant recognition and extraction errors, low computational efficiency, and limited navigation accuracy, a novel approach for multi-type fusion visual navigation is proposed. This method aims to overcome the limitations of single-type features and enhance navigation accuracy. Analytical criteria for selecting multi-type features are introduced, which simultaneously improve computational efficiency and system navigation accuracy. Concerning pose estimation, both absolute and relative pose estimation methods based on multi-type feature fusion are proposed, and multi-type feature normalization is established, which significantly improves system navigation accuracy and lays the groundwork for flexible application of joint absolute-relative estimation. The feasibility and effectiveness of the proposed method are validated through simulation experiments through 4769 Castalia.
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