A Dual One-way Doppler Cancellation Scheme for Enhanced Gravitational Redshift Tests
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908506090635264 |
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| author | Qin, Cheng-Gang Liu, Tong Li, Yang Gong, Qi-Long Li, Qin Ma, Zhi-Yu |
| author_facet | Qin, Cheng-Gang Liu, Tong Li, Yang Gong, Qi-Long Li, Qin Ma, Zhi-Yu |
| contents | Gravitational redshift is an important prediction of General Relativity (GR). We propose a novel dual one-way frequency comparison scheme for gravitational redshift tests in satellite-ground clock experiments. Unlike conventional triple-link Doppler cancellation methods, our approach requires only two optical links, an uplink and a downlink, with Doppler data recorded independently at the satellite and ground station, respectively. Crucially, coherent combination of these measurements suppresses first-order Doppler frequency shift to second order while doubling the gravitational redshift signal. This scheme reduced engineering complexity (50$\%$ fewer links) and amplified redshift sensitivity with a factor of 2 for satellite-ground clock comparison. The scheme's viability hinges on high-precision clock synchronization ($\leq$ 0.1 ns for $10^{-18}$ clock comparison), which is potentially achievable via state-of-the-art time-transfer techniques. Systematic error analysis confirms residual Doppler, atmospheric, and Shapiro shifts remain below $10^{-17}$ for optimized orbits, establishing this scheme as a useful tool for probing fundamental physics beyond GR. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19886 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Dual One-way Doppler Cancellation Scheme for Enhanced Gravitational Redshift Tests Qin, Cheng-Gang Liu, Tong Li, Yang Gong, Qi-Long Li, Qin Ma, Zhi-Yu General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Gravitational redshift is an important prediction of General Relativity (GR). We propose a novel dual one-way frequency comparison scheme for gravitational redshift tests in satellite-ground clock experiments. Unlike conventional triple-link Doppler cancellation methods, our approach requires only two optical links, an uplink and a downlink, with Doppler data recorded independently at the satellite and ground station, respectively. Crucially, coherent combination of these measurements suppresses first-order Doppler frequency shift to second order while doubling the gravitational redshift signal. This scheme reduced engineering complexity (50$\%$ fewer links) and amplified redshift sensitivity with a factor of 2 for satellite-ground clock comparison. The scheme's viability hinges on high-precision clock synchronization ($\leq$ 0.1 ns for $10^{-18}$ clock comparison), which is potentially achievable via state-of-the-art time-transfer techniques. Systematic error analysis confirms residual Doppler, atmospheric, and Shapiro shifts remain below $10^{-17}$ for optimized orbits, establishing this scheme as a useful tool for probing fundamental physics beyond GR. |
| title | A Dual One-way Doppler Cancellation Scheme for Enhanced Gravitational Redshift Tests |
| topic | General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2508.19886 |