research introduction: Observability Analysis of Satellites Perturbed by Solar Radiation Pressure in Angles-Only Navigation
日本語字幕有り
- Takenori Sumi, Yasuhiro Yoshimura, Toshiya Hanada, Observability Analysis of Satellites Perturbed by Solar Radiation Pressure in Angles-Only Navigation.
近年、宇宙機同士が近接して作業を行うオンオービットサービスが注目されています。そのためには、相対位置を正確に把握する「相対軌道推定」が重要です。本研究では、カメラで得られる角度情報（方位角と仰角）のみを用いる「角度のみ航法」において、太陽輻射圧が可観測性に与える影響を解析しました。衛星の形状や姿勢を考慮した詳細な太陽輻射圧モデルを用い、情報行列に基づく指標で可観測性を定量評価しました。その結果、2機の衛星間で太陽輻射圧の差が大きい場合、相対軌道要素の推定精度が大きく向上することが示されました。さらに、この指標を組み込んだ改良型カルマンフィルタを用いることで、従来法よりも高速かつ高精度に軌道を推定できることを確認しました。
In recent years, on-orbit servicing, where spacecraft work in close proximity to each other, has been gaining attention. To enable this, "relative orbit estimation," which accurately determines relative positions, is crucial. In this study, we analyzed the impact of solar radiation pressure on observability in "angles-only navigation," which uses only angular information (azimuth and elevation) obtained from cameras. We employed a detailed solar radiation pressure model that accounts for satellite shape and attitude, and quantitatively evaluated observability using an information matrix-based metric. The results showed that when there is a significant difference in solar radiation pressure between two satellites, the estimation accuracy of relative orbital elements is greatly improved. Furthermore, we confirmed that by using an improved Kalman filter incorporating this metric, relative orbits can be estimated faster and with higher accuracy than conventional methods.