scholarly journals StarNAV: Autonomous Optical Navigation of a Spacecraft by the Relativistic Perturbation of Starlight

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4064 ◽  
Author(s):  
John Christian
Keyword(s):  
Autonomous Navigation ◽  
Space Exploration ◽  
Spectral Shift ◽  
Mission Design ◽  
Limiting Factor ◽  
Optical Navigation ◽  
Promising Technique ◽  
Naturally Occurring ◽  
Future Space ◽  
Stellar Aberration

Future space exploration missions require increased autonomy. This is especially true for navigation, where continued reliance on Earth-based resources is often a limiting factor in mission design and selection. In response to the need for autonomous navigation, this work introduces the StarNAV framework that may allow a spacecraft to autonomously navigate anywhere in the Solar System (or beyond) using only passive observations of naturally occurring starlight. Relativistic perturbations in the wavelength and direction of observed stars may be used to infer spacecraft velocity which, in turn, may be used for navigation. This work develops the mathematics governing such an approach and explores its efficacy for autonomous navigation. Measurement of stellar spectral shift due to the relativistic Doppler effect is found to be ineffective in practice. Instead, measurement of the change in inter-star angle due to stellar aberration appears to be the most promising technique for navigation by the relativistic perturbation of starlight.

Electrical Power Requirements for Future Space Exploration

1965 ◽  
Vol 12 (1) ◽  
pp. 189-196 ◽  
Author(s):  
L. H. Wood ◽  
R. I. Vachon ◽  
R. N. Seitz
Keyword(s):  
Space Exploration ◽  
Electrical Power ◽  
Future Space

scholarly journals Remote Laser Induced Fluorescence of Soils and Rocks

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 411
Author(s):  
Vasily N. Lednev ◽  
Alexey F. Bunkin ◽  
Sergey M. Pershin ◽  
Mikhail Ya. Grishin ◽  
Diana G. Artemova ◽  
...  
Keyword(s):  
Fluorescence Spectroscopy ◽  
Fluorescence Spectra ◽  
Space Exploration ◽  
Laser Induced Fluorescence ◽  
Excitation Wavelength ◽  
Extraterrestrial Life ◽  
Future Space ◽  
Lidar Sensing ◽  
First Time ◽  
Different Soils

The laser induced fluorescence spectroscopy was systematically utilized for remote sensing of different soils and rocks for the first time, to the best of our knowledge. Laser induced fluorescence spectroscopy measurements were carried out by the developed nanosecond LIDAR instrument with variable excitation wavelength (355, 532 and 1064 nm). LIDAR sensing of different Brazil soil samples have been carried out in order to construct a spectral database. The laser induced fluorescence spectra interpretation for different samples has been discussed in detail. The perspectives of LIDAR sensing of organic samples deposited at soils and rock have been discussed including future space exploration missions in the search for extraterrestrial life.

A methodology for innovative technologies roadmaps assessment to support strategic decisions for future space exploration

2014 ◽  
Vol 94 (2) ◽  
pp. 813-833 ◽  
Author(s):  
Maria Antonietta Viscio ◽  
Eugenio Gargioli ◽  
Jeffrey A. Hoffman ◽  
Paolo Maggiore ◽  
Andrea Messidoro ◽  
...  
Keyword(s):  
Space Exploration ◽  
Strategic Decisions ◽  
Innovative Technologies ◽  
Future Space

scholarly journals Optimal Trajectory Determination and Mission Design for Asteroid/Deep-Space Exploration via Multibody Gravity Assist Maneuvers

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sean Fritz ◽  
Kamran Turkoglu
Keyword(s):  
Optimal Trajectory ◽  
Space Exploration ◽  
Fuel Efficiency ◽  
Real Life ◽  
Ecliptic Plane ◽  
Mission Design ◽  
Gravity Assist ◽  
Deep Space Exploration ◽  
Interplanetary Missions ◽  
Trajectory Determination

This paper discusses the creation of a genetic algorithm to locate and optimize interplanetary trajectories using gravity assist maneuvers to improve fuel efficiency of the mission. The algorithm is implemented on two cases: (i) a Centaur-class target close to the ecliptic plane and (ii) a Centaur-class target with a high inclination to the ecliptic plane. Cases for multiple numbers of flybys (up to three) are discussed and compared. It is shown that, for the targets considered here, a single flyby of Jupiter is the most efficient trajectory to either target with the conditions and limitations discussed in this paper. In this paper, we also iterate on possible reasons for certain results seen in the analysis and show how these previously observed behaviors could be present in any trajectory found. The parameters and methods used in the algorithm are explained and justified over multiple real-life interplanetary missions to provide deeper insights into the development choices.

Antimony Clustering due to High-dose Implantation

2000 ◽  
Vol 610 ◽  
Author(s):  
Kentaro Shibahara ◽  
Dai Onimatsu
Keyword(s):  
Sheet Resistance ◽  
Rapid Thermal Annealing ◽  
Implantation Dose ◽  
Limiting Factor ◽  
High Dose ◽  
Junction Depth ◽  
Promising Technique ◽  
Depth Profiles ◽  
Dopant Loss ◽  
High Dose Implantation

AbstractAntimony implantation is a promising technique for fabricating ultra-shallow n+/p junctions for extensions of sub-100-nm n-MOSFETs. By increasing the Sb+ implantation dose to 6×1014 cm−2, sheet resistance (Rs) of an implanted layer was reduced to 260 /sq. for rapid thermal annealing (RTA) at 800°C. The obtained junction depth of 19 nm is suitable for sub-100-nm MOSFETs. However, the reduction in the sheet resistance showed a tendency to saturate. No pileup at the Si-SiO2 interface, which was the major origin of dopant loss in lower dose cases was, observed in Sb depth profiles in this case. However, in the case of 900°C RTA, Sb depth profiles indicated that Sb was nearly immobile in the region where Sb concentration exceeded 1×1020 cm−3. These results imply that the major limiting factor of Rs reduction under the highdose condition is Sb precipitation, which is different from the lower dose cases.

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