In this study, a batch least square estimator that utilizes optical observation data is developed and utilized to determine geostationary orbits (GEO). Through numerical simulations, the effects of error sources, such as clock errors, measurement noise, and the a priori state error, are analyzed. The actual optical tracking data of a GEO satellite, the Communication, Ocean and Meteorological Satellite (COMS), provided by the optical wide-field patrol network (OWL-Net) is used with the developed batch filter for orbit determination. The accuracy of the determined orbit is evaluated by comparison with two-line elements (TLE) and confirmed as proper for the continuous monitoring of GEO objects. Also, the measurement residuals are converged to several arcseconds, corresponding to the OWL-Net performance. Based on these analyses, it is verified that the independent operation of electro-optic space surveillance systems is possible, and the ephemerides of space objects can be obtained.

1. INTRODUCTION
2. BATCH LEAST SQUARES FILTER ANDVERIFICATION
    2.1 Methodology
    2.2 Software Verification
3. CHARACTERISTICS ANALYSIS OF OD RESULTS
    3.1 Effect of Arc Length on OD Accuracy
    3.2 Effect of Observation Interval on OD Accuracy
    3.3 Effect of a Priori Uncertainty on OD Accuracy
    3.4 Effect of Measurement Noise on OD Accuracy
    3.5 Effect of Clock Error on OD Accuracy
4. APPLICATION OF ACTUAL DATA FROM OWL-NET
    4.1 TLE Analysis for COMS
    4.2 COMS Orbit Determination using OWL-Net Data
5. CONCLUSIONS
REFERENCES

• Bumjoon Shin(Department of Astronomy, Yonsei University)
• Eunji Lee(Department of Astronomy, Yonsei University)
• Sang-Young Park(Department of Astronomy, Yonsei University) Corresponding Author