Optical Tracking Data Validation and Orbit Estimation for Sparse Observations of Satellites by the OWL-Net
An Optical Wide-field patroL-Network (OWL-Net) has been developed for maintaining Korean low Earth orbit (LEO) satellites’ orbital ephemeris.The OWL-Net consists of five optical tracking stations.Brightness signals of reflected sunlight of the targets were detected by a charged coupled device (CCD).A chopper system was adopted for fast astrom