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This summary is machine-generated.

Future space-borne gravitational wave detectors need precise inter-satellite ranging. This study demonstrates a novel ranging strategy using arm-locking and time delay interferometry (TDI) for meter-level precision, crucial for noise reduction.

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Area of Science:

  • Astronomy and Astrophysics
  • Optical Physics
  • Metrology

Background:

  • Space-borne gravitational wave (GW) detectors require precise inter-satellite ranging for Time Delay Interferometry (TDI) noise reduction.
  • Existing ranging methods may lack the necessary precision for advanced TDI applications.

Purpose of the Study:

  • To demonstrate a robust strategy for absolute inter-satellite distance measurement.
  • To achieve meter-level precision required for TDI in future GW observatories.

Main Methods:

  • Coarse distance determination using arm-locking ranging with a large non-ambiguity range.
  • Precise distance measurement via TDI ranging by minimizing residual noise power.
  • Numerical simulations and experimental verification using a fiber link.

Main Results:

  • Numerical simulations achieved millimeter-level precision in distance measurements.
  • Experimental verification demonstrated distance measurements with better than 0.05 m uncertainty.
  • The proposed method satisfies the precision requirements for TDI.

Conclusions:

  • The combined arm-locking and TDI ranging strategy is effective for precise inter-satellite distance measurement.
  • This technique is vital for enabling advanced noise reduction in space-borne GW detectors.
  • The demonstrated precision meets the stringent demands of future gravitational wave missions.