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Unidirectional Orbit Determination for Extended Users Based on Navigation Ka-Band Inter-Satellite Links.

Yong Shangguan1,2, Hua Zhang1, Yong Yu2

  • 1School of Information Science and Engineering, Southeast University, Nanjing 210096, China.

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Summary

This study introduces a new Ka-band inter-satellite link technology for precise orbit determination of spacecraft without atomic clocks. It achieves 100m accuracy, enhancing navigation satellite system capabilities for extended users.

Keywords:
Ka-band inter-satellite linksemergency communicationorbit determinationsatellite navigation systemtime–frequency synchronization

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Area of Science:

  • Spacecraft orbit determination
  • Satellite navigation systems
  • Ka-band inter-satellite links

Background:

  • Traditional orbit determination methods (ground stations, GNSS) face limitations in efficiency, cost, and precision for high-orbit satellites.
  • Global navigation satellite systems (GNSS) offer limited coverage and signal strength for high-orbit applications.
  • Extended users (satellites, aircraft) require robust orbit determination, especially when ground tracking is unavailable.

Purpose of the Study:

  • To develop an innovative unidirectional orbit-determination technology for extended users leveraging Ka-band inter-satellite links.
  • To enable high-precision orbit determination for users without atomic clocks, addressing weight and power constraints.
  • To improve time-frequency synchronization and communication capabilities for extended users.

Main Methods:

  • Utilizing Ka-band inter-satellite links for distance measurements between navigation satellites.
  • Constructing clock error models, calculating parameters, and compensating for clock errors.
  • Establishing a mechanical model and state-transfer matrix using bidirectional ranging values for orbit calculation.

Main Results:

  • Achieved high-precision time-frequency synchronization, enhancing accuracy by three and two orders of magnitude, respectively.
  • Enabled orbit determination with an accuracy of less than 100 meters.
  • Demonstrated the feasibility of using minimal inter-satellite link time slot resources for orbit determination.

Conclusions:

  • The developed technology provides a robust solution for high-precision orbit determination for extended users lacking atomic clocks.
  • This advancement offers significant technical support for emergency communication and orbit determination using Ka-band inter-satellite links.
  • Represents a breakthrough in China for extended users accessing navigation inter-satellite links for precise orbit determination.