Eclipse avoidance in TianQin orbit selection

Ye, Bobing; Zhang, Xuefeng; Yanwei, Ding; Meng, Yunhe

doi:10.1103/physrevd.103.042007

Cited by 34 publications

(18 citation statements)

References 18 publications

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“…In addition to the optimized orbits found in [36], other stable options, such as the inclined retrograde orbits, have been identified and may be further evaluated, from other aspects, as potential backups to TianQin. For future work, systematic refinement of TianQin geocentric orbit design will be carried out, where more environmental factors, such as solar eclipses [44], the Earth-Moon's gravity field [45], and solar illumination, are taken into account.…”

Section: Discussionmentioning

confidence: 99%

Impact of orbital orientations and radii on TianQin constellation stability

Tan

Zhang

2020

Int. J. Mod. Phys. D

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TianQin is a proposed space-based gravitational-wave observatory mission to be deployed in high circular Earth orbits. The equilateral-triangle constellation, with a nearly fixed orientation, can be distorted primarily under the lunisolar perturbations. To accommodate science payload requirements, one must optimize the orbits to stabilize the configuration in terms of arm-length, relative velocity, and breathing angle variations. In this paper, we present an efficient optimization method and investigate how changing the two main design factors, i.e. the orbital orientation and radius, impacts the constellation stability through single-variable studies. Thereby, one can arrive at the ranges of the orbital parameters that are comparatively more stable, which may assist future refined orbit design.

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Section: Discussionmentioning

confidence: 99%

Impact of orbital orientations and radii on TianQin constellation stability

Tan

Zhang

2020

Int. J. Mod. Phys. D

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“…Here, we use NASA developed open source software General Mission Analysis Tool (GMAT) to generate orbital data with 1 s step size [62]. This software has been previously used to study the problems associated with the orbit of TianQin [11,[63][64][65]. The starting time of the satellite orbit is 10 Aug 2034 00:00 UTC, which is within the detection period of 3+3 month observation window [8].…”

Section: Appendix A: Numerical Orbitsmentioning

confidence: 99%

Plasma noise in TianQin time-delay interferometry

Jing

Zheng²,

Yang³

et al. 2022

Phys. Rev. D

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TianQin is a proposed geocentric space-based gravitational wave observatory mission, which requires time-delay interferometry (TDI) to cancel laser frequency noise. With high demands for precision, solar-wind plasma environment at ∼ 10 5 km above the Earth may constitute a nonnegligible noise source to laser interferometric measurements between satellites, as charged particles perturb the refractivity along light paths. In this paper, we first assess the plasma noises along single links from space-weather models and numerical orbits, and analyze the time and frequency domain characteristics. Particularly, to capture the plasma noise in the entire measurement band of 10 −4 − 1 Hz, we have performed additional space-weather magnetohydrodynamic simulations in finer spatial and temporal resolutions and utilized Kolmogorov spectra in high-frequency data generation. Then we evaluate the residual plasma noises of the first-and second-generation TDI combinations. Both analytical and numerical estimations have shown that under normal solar conditions the plasma noise after TDI is less than the secondary noise requirement. Moreover, TDI is shown to exhibit moderate suppression on the plasma noise below ∼ 10 −2 Hz due to noise correlation between different arms, when compared with the secondary noise before and after TDI.

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“…To avoid these problems or mitigate their impact, very careful orbit optimizations and controls have been studied in a series of papers [74][75][76][77] . It was confirmed that choosing high Earth orbits can free TianQin from the disturbing effect of the nearby gravitational field of the Earth-Moon system, because the Newtonian gravity-field environment at 10 5 km from the Earth is fairly quiet and the effect of the Earth-Moon system's gravity field dominates at frequencies below 10 −4 Hz and falls off rapidly towards high frequencies 76 .…”

Section: Tianqin Projectmentioning

confidence: 99%

“…It was confirmed that choosing high Earth orbits can free TianQin from the disturbing effect of the nearby gravitational field of the Earth-Moon system, because the Newtonian gravity-field environment at 10 5 km from the Earth is fairly quiet and the effect of the Earth-Moon system's gravity field dominates at frequencies below 10 −4 Hz and falls off rapidly towards high frequencies 76 . To reduce the impact of eclipses on the thermal stability and steady power supply of the spacecraft, two strategies for choosing the orbit were proposed 77 . The first selects the initial phase to be ∼ 15 • .…”

Section: Tianqin Projectmentioning

confidence: 99%

Concepts and status of Chinese space gravitational wave detection projects

Gong,

Luo,

Wang

2021

Preprint

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Gravitational wave (GW) detection in space probes GW spectrum that is inaccessible from the Earth. In addition to LISA project led by European Space Agency, and the DECIGO detector proposed by the Japan Aerospace Exploration Agency, two Chinese space-based GW observatories-TianQin and Taiji-are planned to be launched in the 2030s. TianQin has a unique concept in its design with a geocentric orbit. Taiji's design is similar to LISA, but is more ambitious with longer arm distance. Both facilities are complementary to LISA, considering that TianQin is sensitive to higher frequencies and Taiji probes similar frequencies but with higher sensitivity. In this Perspective we explain the concepts for both facilities and introduce the development milestones of TianQin and Taiji projects in testing extraordinary technologies to pave the way for future space-based GW detections. Considering that LISA, TianQin and Taiji have similar scientific goals, all are scheduled to be launched around the 2030s and will operate concurrently, we discuss possible collaborations among them to improve GW source localization and characterization.

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Eclipse avoidance in TianQin orbit selection

Cited by 34 publications

References 18 publications

Impact of orbital orientations and radii on TianQin constellation stability

Impact of orbital orientations and radii on TianQin constellation stability

Plasma noise in TianQin time-delay interferometry

Concepts and status of Chinese space gravitational wave detection projects

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