A Satellite System for Avoiding Serial Sun-Transit Outages and Eclipses

Lundgren, C. W.

doi:10.1002/j.1538-7305.1970.tb04296.x

Cited by 9 publications

(1 citation statement)

References 3 publications

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“…Another related example can be seen in Chang'e 4's relay satellite Queqiao near the Earth-Moon L2 point, which has adopted a halo orbit with carefully chosen amplitudes and phases in order to avoid eclipses and lunar occultation of the Earth [25][26][27][28][29]. Useful eclipse avoidance strategies can also be found in the design of near rectilinear halo orbits [30][31][32][33][34] and geostationary orbits [35,36]. This is the fourth paper of our concept study series on TianQin's orbit and constellation [16,37,38].…”

Section: Introductionmentioning

confidence: 99%

Eclipse avoidance in TianQin orbit selection

Ye,

Zhang,

Ding

et al. 2020

Preprint

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In future geocentric space-based gravitational-wave observatory missions, eclipses due to passing through the Moon's and Earth's shadows can negatively impact the sciencecraft's thermal stability and steady power supply. The occurrence should be reduced as much as possible in orbit design. In regard to TianQin's circular high orbits, we tackle the combined challenges of avoiding eclipses and stabilizing the nearly equilateral-triangle constellation. Two strategies are proposed, including initial phase selection and orbit resizing to 1:8 synodic resonance with the Moon, where the latter involves slightly raising TianQin's preliminary orbital radius of 1 × 10 5 km to ∼ 100900 km. As the result, we have identified pure-gravity target orbits with a permitted initial phase range of ∼ 15 • , which can maintain eclipse-free during the 3+3 month observation windows throughout a 5-year mission started in 2034, and meanwhile fulfil the constellation stability requirements. Thereby the eclipse issue for TianQin can be largely resolved.

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Section: Introductionmentioning

confidence: 99%

Eclipse avoidance in TianQin orbit selection

Ye,

Zhang,

Ding

et al. 2020

Preprint

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Earth Stations

2020

Satellite Communications Systems

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Effects of solar transit on K_u‐band VSAT systems

Mohamadi

Lyon²,

Murrell³

1988

Int. J. Satell. Commun.

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A satellite earth‐station is affected by added radio noise from the Sun when the Sun passes behind the satellite as seen from the earth‐station. In the following, an exact analysis of this solar transit is derived, and an approximate method is presented for practical cases. Moreover, networks of very small aperture satellite terminals (VSATs) operating at Ku‐band microwave frequencies of 12–14 GHz behave differently during the solar transit period than the more traditional C‐ or Ku‐band satellite networks; therefore analytical and experimental results for VSATs have been presented. An explanation is given, based on these analyses, of why solar transit outages are rarer in VSATs than in conventional satellite communications systems.

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A Satellite System for Avoiding Serial Sun-Transit Outages and Eclipses

Abstract: The motions of satellites phased in particular, slightly inclined orbits are timed so that different satellites are north and south of the equator when sun‐caused outages occur in geostationary equatorial systems.

Cited by 9 publications

References 3 publications

Eclipse avoidance in TianQin orbit selection

Eclipse avoidance in TianQin orbit selection

Earth Stations

Effects of solar transit on K_u‐band VSAT systems

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A Satellite System for Avoiding Serial Sun-Transit Outages and Eclipses

Abstract: The motions of satellites phased in particular, slightly inclined orbits are timed so that different satellites are north and south of the equator when sun‐caused outages occur in geostationary equatorial systems.

Cited by 9 publications

References 3 publications

Eclipse avoidance in TianQin orbit selection

Eclipse avoidance in TianQin orbit selection

Earth Stations

Effects of solar transit on Ku‐band VSAT systems

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Effects of solar transit on K_u‐band VSAT systems