In this paper, a brief but essential development strategy for the lunar orbit determination system is discussed to prepare for the future Korea’s lunar missions. Prior to the discussion of this preliminary development strategy, technical models of foreign agencies for the lunar orbit determination system, tracking networks to measure the orbit, and collaborative efforts to verify system performance are reviewed in detail with a short summary of their lunar mission history. Covered foreign agencies are European Space Agency, Japan Aerospace Exploration Agency, Indian Space Research Organization and China National Space Administration. Based on the lessons from their experiences, the preliminary development strategy for Korea’s future lunar orbit determination system is discussed with regard to the core technical issues of dynamic modeling, numerical integration, measurement modeling, estimation method, measurement system as well as appropriate data formatting for the interoperability among foreign agencies. Although only the preliminary development strategy has been discussed through this work, the proposed strategy will aid the Korean astronautical society while on the development phase of the future Korea’s own lunar orbit determination system. Also, it is expected that further detailed system requirements or technical development strategies could be designed or established based on the current discussions.

1. INTRODUCTION
 2. FOREIGN AGENCIES’ EXPERIENCES
  2.1 ESA’s Experiences
  2.2. JAXA’s Experiences
  2.3. ISRO’s Experiences
  2.4. CNSA’s Experiences
 3. DISCUSSIONS ON TECHNICAL ISSUES
  3.1 Dynamic Modeling
  3.2 Measurement Modeling and Estimation Method
  3.3 Implementation of Data Format for OD System
  3.4 Verification and Validation strategy
 4. CONCLUSIONS
 REFERENCES
 Appendix

• Young-Joo Song(Korea Aerospace Research Institute) Corresponding Author
• Sang-il Ahn(Korea Aerospace Research Institute)
• Eun-Sup Sim(Korea Aerospace Research Institute)