研究目的
To analyze three geometry error sources for the solar Doppler difference navigation method, specifically the area overlap rate of direct and reflected solar light sources, spread effects of time difference of arrival (TDOA), and solar rotation Doppler difference error, to assess the feasibility and effectiveness of this navigation method during the capture phase of deep space exploration missions.
研究成果
The theoretical analyses and simulations confirm that the direct and reflected solar light sources can be approximated as the same source in space and time, with high area overlap rates (>99.9%) and manageable spread effects. The solar rotation Doppler difference error can be compensated using a derived model, forming a hemi-ellipsoid. All three errors decrease as the explorer approaches Mars, enhancing navigation accuracy during the capture period. This supports the feasibility of solar Doppler difference navigation, providing a reference for system design, with recommendations for future work on error suppression through advanced signal processing.
研究不足
The analysis assumes the deep space explorer is static for simplification, which may not fully capture dynamic effects. The study focuses on geometry errors and does not address optical errors or spectrometer noise in depth. The simulation is based on a specific mission (Mars Pathfinder), limiting generalizability to other scenarios. Compensation for solar rotation Doppler error relies on position information from other navigation methods, which may introduce dependencies.
