The antenna phase center motion effect in high-accuracy spacecraft tracking experiments

Litvinov, D. A.; Nunes, Nelson V.; Filetkin, A. I.; Bartel, N.; Gurvits, L. I.; Calvés, Guifre Molera; Rudenko, V. N.; Zakhvatkin, M. V.

doi:10.1016/j.asr.2021.07.036

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…Because the heat and radiation generated by the nuclear reactor can damage electronic equipment and other facilities on the spacecraft, it is necessary to separate the nuclear reactor and the main body of the spacecraft when designing the nuclear-powered spacecraft. Traditional spacecraft is mainly composed of central rigid body and deployable flexible appendages, such as solar panels [2,3], synthetic aperture radar (SAR) [4], and communication antenna [5]. The dumbbell-shaped spacecraft is rigid at both ends and connected by a large flexible truss in the middle.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Robust Control and Active Vibration Suppression of Dumbbell-Shaped Spacecraft

Liu

Fan

et al. 2022

International Journal of Aerospace Engineering

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In this paper, the dynamic modelling of a new configuration spacecraft is investigated. The significance of dumbbell-shaped spacecraft to deep space exploration and the configuration of dumbbell-shaped spacecraft are introduced firstly. Then, the vibration problem of the dumbbell-shaped spacecraft of large-angle attitude maneuver is investigated, and a control program based on the combination of adaptive robust control (ARC) and component synthesis vibration suppression method-seven-section path planning (CSVS-SPP) is proposed. The large-angle attitude maneuver route of the spacecraft, which serves as the reference path, is planned using the CSVS-SPP approach, and the attitude controller is designed using the ARC. This program can effectively reduce the influence of external disturbance and parameter uncertainty on the system performance while completing attitude maneuver and suppress the vibration of the flexible beam during large-angle attitude maneuver. The numerical simulations show the superiority and effectiveness of the proposed ARC+CSVS-SPP.

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Section: Introductionmentioning

confidence: 99%

Adaptive Robust Control and Active Vibration Suppression of Dumbbell-Shaped Spacecraft

Liu

Fan

et al. 2022

International Journal of Aerospace Engineering

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Gravitational redshift test of EEP with RadioAstron from near Earth to the distance of the Moon

Nunes

Bartel

Belonenko

et al. 2023

Class. Quantum Grav.

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The Einstein Equivalence Principle (EEP) is a cornerstone of general relativity and predicts the existence of gravitational redshift. We report on new results of measuring this shift with RadioAstron, a space VLBI spacecraft launched into an evolving high eccentricity orbit around Earth with geocentric distances reaching 353,000km. The spacecraft and ground tracking stations at Pushchino, Russia, and Green Bank, USA, were each equipped with a hydrogen maser frequency standard allowing a possible violation of the predicted gravitational redshift, in the form of a violation parameter ε, to be measured. By alternating between RadioAstron’s frequency referencing modes during dedicated sessions between 2015 and 2017, the recorded downlink frequencies can essentially be corrected for the non-relativistic Doppler shift. We report on an analysis using the Doppler-tracking frequency measurements made during these sessions and find ε = (2.1 ± 3.3) × 10−4. We also discuss prospects for measuring ε with an uncertainty on the order of 10−5 using instead the time-domain recordings of the spacecraft signals and envision how 10−7 might be possible for a future space VLBI mission.

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Research of the PAA Operation under Time-Varying Overloads

Pyatibratov,

Seregin

2024

2024 6th International Youth Conference on Radio Electronics, Electrical and Power Engineering (REEPE)

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The antenna phase center motion effect in high-accuracy spacecraft tracking experiments

Cited by 4 publications

References 22 publications

Adaptive Robust Control and Active Vibration Suppression of Dumbbell-Shaped Spacecraft

Adaptive Robust Control and Active Vibration Suppression of Dumbbell-Shaped Spacecraft

Gravitational redshift test of EEP with RadioAstron from near Earth to the distance of the Moon

Research of the PAA Operation under Time-Varying Overloads

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