研究目的
To analyze the effectiveness of a short-arc optical observation strategy for orbital ephemeris maintenance using the OWL-Net to reduce schedule overlapped events and maintain orbit determination accuracy.
研究成果
The short-arc optical observation strategy effectively reduces schedule overlapped events and maintains orbit determination accuracy similar to full-arc strategies, providing more observation opportunities. A 60s arc-length is proposed as optimal for OWL-Net operations.
研究不足
Weather conditions and system anomalies were not considered in simulations. The study did not incorporate environmental factors that could reduce observation opportunities in real situations. Orbit determination for elliptical orbits like STSAT-2C failed due to geometrical limitations.
1:Experimental Design and Method Selection:
The study involved optical observation simulations and orbit determination tests using various short-arc strategies (5s, 10s, 60s, 120s, full-arc) to reduce overlapped events. Theoretical models included orbital mechanics and Kalman filtering for estimation.
2:Sample Selection and Data Sources:
Data from 11 Korean LEO satellites were used, with TLEs from JSpOC for 2014-2016 simulations and real observation data from OWL-Net for KOMPSAT-1 in
3:List of Experimental Equipment and Materials:
20 Optical tracking systems of OWL-Net, commercial software System Tool Kit and Orbit Determination Tool Kit by Analytical Graphics Inc., assumed seeing errors of 5 arc-seconds.
4:Experimental Procedures and Operational Workflow:
Simulated optical observations with constraints (sun elevation limit -6 degrees, site elevation limit 5 degrees), performed weekly-based overlap event analysis, and conducted orbit determination tests with error modeling for atmospheric density, solar radiation pressure, etc.
5:Data Analysis Methods:
Used Kalman filter for orbit estimation, compared estimated orbits with reference orbits in RIC frame, analyzed position uncertainties and differences, and used root mean square (RMS) for error assessment.
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