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Supporting NASA Artemis 1 mission with JAXA Uchinoura station

Supporting NASA Artemis 1 mission with JAXA Uchinoura station

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This chapter presents an ongoing effort in preparing JAXA Uchinoura station support to the Artemis 1 mission, scheduled for launch in late 2020. The system involves three key participants: JAXA ground station at Uchinoura, the Deep Space Network (DSN) components at the Jet Propulsion Laboratory, California, and the Artemis 1 mission navigation at the NASA Johnson Space Center, Texas. Demonstration of Uchinoura station support to the future Artemis signal relies on the use of a low-cost, highly-portable software-defined radio (SDR) test equipment as well as the tracking of the Lunar Reconnaissance Orbiter (LRO) spacecraft. Using the SDR equipment, we validated the compatibility of signal format between the Artemis flight radio and the Uchinoura ground station without having to send the flight equipment to the station. By tracking an ongoing operational spacecraft such as LRO, we were able to calibrate the performance of the system in real operational conditions. The measured Doppler noise of 0.03 Hz (1-sigma), or 0.002 m/s range rate at S-band, for Uchinoura station is deemed suitable to the Artemis 1 mission navigation needs. This chapter also discusses the test equipment capability and its performance. In addition to being low cost, the equipment offers many advantages compared to the traditional full-scaled test signal simulator. Chief among them is portability making system easy to set up and transport, and the fidelity of the test signal that it captures from spacecraft flight equipment. Some of the lessons learned, such as internal frequency stability of the test signal, are also reflected.

Chapter Contents:

  • 17.1 Introduction
  • 17.2 Operation concept
  • 17.3 Recording/playback test equipment
  • 17.4 Result of Artemis compatibility test
  • 17.5 Result of LRO spacecraft tracking
  • 17.6 Conclusion
  • Acknowledgments
  • References

Inspec keywords: space communication links; software radio; satellite ground stations; artificial satellites; space vehicles

Other keywords: velocity 0.002 m/s; frequency 0.03 Hz; JAXA Uchinoura station support; Artemis 1 mission navigation; Lunar Reconnaissance Orbiter spacecraft; full-scaled test signal simulator; spacecraft flight equipment; NASA Johnson Space Center; Artemis flight radio; Uchinoura ground station; JAXA ground station; NASA Artemis 1 mission; operational spacecraft; Artemis signal; Jet Propulsion Laboratory; Deep Space Network components; highly-portable software-defined radio test equipment; SDR equipment; test equipment capability

Subjects: Aerospace instrumentation; Space communication systems; Satellite communication systems

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