Development of a Long-term Earth-Moon Trans-lunar Libration Point Orbit for a Communication Relay Satellite PDF Download
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Author:
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages :
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Given the absence of an orbital system to communicate from the far side of the Moon, it is likely that such a system shall be needed in the near future with the continued interest in lunar exploration and utilization. A strategy for a long-term libration orbit at the Earth-Moon L2 point is developed. This strategy allows for uninterrupted two-way communication between the Earth and the far side of the Moon and vice versa while also maintaining low fuel costs, thus increasing the duration of possible missions. A scenario was created in STK that created such an orbit. The results of the scenario predict a total station keeping delta-V cost of only 3.23 m/s for a satellite to stay in the vicinity of the EML2 point for five years.
Author:
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages :
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Book Description
Given the absence of an orbital system to communicate from the far side of the Moon, it is likely that such a system shall be needed in the near future with the continued interest in lunar exploration and utilization. A strategy for a long-term libration orbit at the Earth-Moon L2 point is developed. This strategy allows for uninterrupted two-way communication between the Earth and the far side of the Moon and vice versa while also maintaining low fuel costs, thus increasing the duration of possible missions. A scenario was created in STK that created such an orbit. The results of the scenario predict a total station keeping delta-V cost of only 3.23 m/s for a satellite to stay in the vicinity of the EML2 point for five years.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720450795
Category :
Languages : en
Pages : 70
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Book Description
In 2003, NASA solicited proposals for a robotic exploration of the lunar surface. Submissions were requested for a lunar sample return mission from the South Pole-Aitken Basin. The basin is of interest because it is thought to contain some of the oldest accessible rocks on the lunar surface. A mission is under study that will land a spacecraft in the basin, collect a sample of rock fragments, and return the sample to Earth. Because the Aitken Basin is on the far side of the Moon, the lander will require a communications relay satellite (CRS) to maintain contact with the Earth during its surface operation. Design of the CRS's orbit is therefore critical. This paper describes a mission design which includes potential transfer and mission orbits, required changes in velocity, orbital parameters, and mission dates. Several different low lunar polar orbits are examined to compare their availability to the lander versus the distance over which they must communicate. In addition, polar orbits are compared to a halo orbit about the Earth-Moon L2 point, which would permit continuous communication at a cost of increased fuel requirements and longer transmission distances. This thesis also examines some general parameters of the spacecraft systems for the mission under study. Mission requirements for the lander dictate the eventual choice of mission orbit. This mission could be the first step in a period of renewed lunar exploration and eventual human landings.Brunner, Christopher W.Langley Research CenterRELAY SATELLITES; SAMPLE RETURN MISSIONS; SATELLITE DESIGN; LUNAR GEOLOGY; STRUCTURAL BASINS; COSTS; LUNAR ROCKS; LUNAR SOIL; ECCENTRIC ORBITS; FLYBY MISSIONS; TIME OF FLIGHT SPECTROMETERS; EARTH-MOON SYSTEM
Author: Jeet A. Patel
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
New transportation, communication, and logistic infrastructures are being planned and developed for cislunar space in the Earth-Moon system. Cislunar trajectories encompass all of the orbits revolving around the Earth (circumterrestrial) and Moon (circumlunar), as well as those about the Earth-Moon Lagrange point (libration-point orbits) and the various paths between the Earth and Moon (trans-lunar trajectories and transfers). The scope herein is limited to the circumlunar class of orbits, thereby omitting discussions on near-Earth trajectories from low-Earth orbits to the geosynchronous regime, as well as lunar transfers and libration-point orbits. This thesis investigates the long-term dynamics of lunar orbiters, with a particular emphases on special solutions (e.g., frozen and resonant orbits) that have been uncovered in the literature. NASA's General Mission Analysis Tool (GMAT) is used to provide high-fidelity orbit integrations and dynamical maps, which serve to validate previous analytical and semi-analytical results as well as explore more completely the neighboring phase space.
Author: P. E. Schmid
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 28
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Author: Christopher W. Brunner
Publisher: BiblioGov
ISBN: 9781289146177
Category :
Languages : en
Pages : 72
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Book Description
In 2003, NASA solicited proposals for a robotic exploration of the lunar surface. Submissions were requested for a lunar sample return mission from the South Pole-Aitken Basin. The basin is of interest because it is thought to contain some of the oldest accessible rocks on the lunar surface. A mission is under study that will land a spacecraft in the basin, collect a sample of rock fragments, and return the sample to Earth. Because the Aitken Basin is on the far side of the Moon, the lander will require a communications relay satellite (CRS) to maintain contact with the Earth during its surface operation. Design of the CRS's orbit is therefore critical. This paper describes a mission design which includes potential transfer and mission orbits, required changes in velocity, orbital parameters, and mission dates. Several different low lunar polar orbits are examined to compare their availability to the lander versus the distance over which they must communicate. In addition, polar orbits are compared to a halo orbit about the Earth-Moon L2 point, which would permit continuous communication at a cost of increased fuel requirements and longer transmission distances. This thesis also examines some general parameters of the spacecraft systems for the mission under study. Mission requirements for the lander dictate the eventual choice of mission orbit. This mission could be the first step in a period of renewed lunar exploration and eventual human landings.
Author: Jiande Sun
Publisher: Springer Nature
ISBN: 9811933871
Category : Technology & Engineering
Languages : en
Pages : 1534
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Book Description
This book collects selected papers from the 8th Conference on Signal and Information Processing, Networking and Computers held in Ji’nan, Shandong, China on September 13-17, 2021. It focuses on the current works of information theory, communication system, computer science, aerospace technologies and big data and other related technologies. Readers from both academia and industry of this field can contribute and find their interests from the book.
Author: Robert Willard Farquhar
Publisher:
ISBN:
Category : Artificial satellites in telecommunication
Languages : en
Pages : 116
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 288
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Author:
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ISBN:
Category : Outer space
Languages : en
Pages : 614
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Author: Peter Musen
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 28
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