AI Insight
The GUEST mission proposes to detect gravitational waves in the unexplored microhertz frequency range using high-precision satellite tracking in a highly eccentric orbit. Researchers have designed a novel optical system incorporating two types of Corner-Cube Retroreflectors with different apertures to address the dual measurement challenges posed by vastly different conditions at apogee (low-velocity, long-range) and perigee (high-velocity, short-range). The optical architecture has been optimized for uniform response across the spherical spacecraft surface, with performance validated through modeling calibrated against the LARES-2 satellite.
Why it matters
This work advances the technical capability to detect gravitational waves in a frequency range that remains largely unexplored, potentially opening a new window for observing cosmic phenomena such as supermassive black hole binaries and early universe processes that produce signals in this frequency band.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: The GUEST (Gravitational Universe Exploration with Satellite Tracking) mission aims at detecting gravitational waves in the yet almost unexplored $mu$Hz frequency range through high-precision orbital tracking. The unprecedented scientific objectives of this experiment demand equally advanced optical solutions: the highly eccentric orbit imposes dual measurement regimes; a low-velocity, long-range scenario at apogee and a high-velocity, short-range scenario at perigee. The substantial disparity between these conditions is addressed through a novel optical architecture incorporating two distinct types of Corner-Cube Retroreflectors (CCRs) with 1″ and 2″ apertures (CCR1 and CCR2, respectively). The proposed layout has been designed to ensure isotropy and homogeneity of the optical response while maintaining efficient packing over the spherical surface of the spacecraft. The resulting Optical Cross-Section (OCS) has been evaluated using a custom reduced-order model, which captures the behavior of individual CCRs under varying illumination conditions. This model has been calibrated by reconstructing the optical response of the LARES-2 satellite and has enabled a detailed assessment of the contributions of each CCR type along the GUEST orbit. Finally, sensitivity analyses have been conducted to investigate the impact of key design parameters, including the ratio between CCR types, laser wavelength, spacecraft diameter, Dihedral Angle Offsets (DAOs), and mechanical configurations.