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Inter-spacecraft offset frequency setting strategy in the Taiji program.

Jiafeng Zhang, Zhen Yang, Xiaoshan Ma

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    |February 24, 2022
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    Summary
    This summary is machine-generated.

    A new strategy optimizes heterodyne interferometry for gravitational wave detection in the Taiji program. This method ensures stable offset frequencies, potentially eliminating the need for adjustments throughout the mission.

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    Area of Science:

    • Astrophysics and Space Science
    • Gravitational Wave Astronomy
    • Optical Interferometry

    Background:

    • The Taiji program aims to detect gravitational waves in space using heterodyne interferometry.
    • Precise control of beat frequency is crucial for successful gravitational wave detection.
    • Existing methods require complex frequency adjustments, impacting mission efficiency.

    Purpose of the Study:

    • To propose an offset frequency setting strategy for heterodyne interferometry in the Taiji program.
    • To ensure stable inter-spacecraft offset frequencies for long-duration gravitational wave detection.
    • To provide insights for selecting critical operational parameters for the Taiji mission.

    Main Methods:

    • Development of a linear programming algorithm for offset frequency control.
    • Inclusion of key factors: Doppler frequency shift, phase-locking, laser noise, and detector bandwidth.
    • Simulation of a six-year detection process with defined frequency bounds [5 MHz, 25 MHz].

    Main Results:

    • The proposed strategy yields stable inter-spacecraft offset frequencies suitable for the Taiji program.
    • Offset frequencies remained constant for up to 1931 days within the specified frequency bounds.
    • Adjusting frequency bounds and constraining spacecraft motion can allow for mission-long frequency stability.

    Conclusions:

    • The linear programming-based offset frequency strategy is effective for the Taiji gravitational wave mission.
    • Stable offset frequencies can be maintained, simplifying operations and enhancing detection reliability.
    • Findings inform the selection of phase detectors and the design of orbital and laser modulation parameters.