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    Controlling rubidium (Rb) lamplight intensity in atomic clocks significantly reduces GPS signal errors. This stabilization enhances long-term frequency stability, improving global navigation satellite systems.

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    Area of Science:

    • Atomic physics
    • Metrology
    • Satellite navigation

    Background:

    • Global navigation satellite systems (GNSS) like GPS rely on precise timing from atomic clocks.
    • Satellite atomic clock performance, specifically rubidium (Rb) atomic frequency standards (RAFS), is affected by lamplight intensity fluctuations.
    • These fluctuations introduce signal-in-space user-range-error (SIS-URE) in GPS signals.

    Purpose of the Study:

    • To investigate the impact of rubidium lamplight intensity on atomic clock stability.
    • To implement and evaluate a method for controlling Rb lamplight intensity.
    • To assess the potential for improving GPS SIS-URE through enhanced atomic clock stability.

    Main Methods:

    • Implementation of radiofrequency (RF)-power control for the RF-discharge lamp in Rb atomic frequency standards, following the Bloom and Bell proposal.
    • Measurement and analysis of Rb lamplight intensity fluctuations before and after RF-power control.
    • Correlation analysis between lamplight stability and atomic clock frequency stability.

    Main Results:

    • RF-power control of the Rb discharge lamp was successfully implemented.
    • Fluctuations in Rb lamplight intensity were reduced by orders of magnitude.
    • Stabilization of Rb lamplight demonstrated potential for significantly improving RAFS long-term frequency stability.

    Conclusions:

    • RF-power control is an effective method to stabilize Rb lamplight intensity.
    • Stabilized Rb lamplight can lead to improved long-term frequency stability in Rb atomic frequency standards.
    • This approach offers a pathway to significantly reduce GPS SIS-URE and enhance global navigation satellite systems.