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| 2. |
- Anthony, Niklas, et al.
(författare)
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Cubesat Minimoon Rendezvous Mission Synthesis and Analysis
- 2018
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Ingår i: IAC-18. - : International Astronautical Federation.
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Konferensbidrag (refereegranskat)abstract
- This paper introduces a mission concept for the remote characterization of a temporarily-captured asteroid, or “minimoon”, based on the utilization of the CubeSat form-factor. Minimoons are a subpopulation of the estimated two million Near-Earth Objects (NEOs) under 2 meters in diameter, which pass within the Moon’s orbit every year. These temporarily-captured objects do not remain in the Earth-Moon system for long, typically less than one year, and are thus a challenge for developing conventional spacecraft missions. A potential solution to this problem is to utilize the typical rapid-development timelines that CubeSat missions possess. This paper will analyze the requirements and limitations in developing a mission for a CubeSat to rendezvous or fly by a minimoon. This includes exploring the capabilities and applicability of the CubeSat technologies for such a mission, analyzing the erratic nature of minimoon orbits, lying out how such a mission project would be managed, and finally presenting a case study of such missions on the only known minimoon so far, Asteroid 2006 RH120.
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| 3. |
- Bazzocchi, Michael C. F., et al.
(författare)
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A Systematic Assessment of Asteroid Redirection Methods for Resource Exploitation
- 2015
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Konferensbidrag (refereegranskat)abstract
- This paper provides a systematic comparison of the primary asteroid redirection techniques from the perspective of resource exploitation. The goal is to examine the methods for the redirection of a near-Earth asteroid to a stable and easily accessible orbit in the Earth-moon system in order to exploit asteroid resources. The context of resource exploitation provides clear constraints on the asteroid redirection mission, and a systematic comparison can be established within this scope. This work describes each redirection method, and considers the major criteria for mission design. Moreover, a Monte Carlo analysis is performed to assess some attributes concerning the uncertainty intrinsic to asteroid redirection missions. The attributes for each redirection method are then aggregated using a multi-criteria decision making approach. Lastly, the results of the aggregation are presented and discussed.
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| 4. |
- Bazzocchi, Michael C. F., et al.
(författare)
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An Assessment of Multiple Spacecraft Formation for Asteroid Redirection
- 2016
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Ingår i: Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan. - Tokyo : Japan Society for Aeronautical and Space Sciences. - 1884-0485. ; 14:ists30, s. Pk_137-Pk_146
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Tidskriftsartikel (refereegranskat)
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| 5. |
- Bazzocchi, Michael C. F., et al.
(författare)
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Asteroid Redirection Mission Evaluation Using Multiple Landers
- 2018
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Ingår i: The Journal of the astronautical sciences. - : Springer. - 0021-9142 .- 2195-0571. ; 65:2, s. 183-204
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, a low-thrust tugboat redirection method is assessed using multiple spacecraft for a target range of small near-Earth asteroids. The benefits of a landed configuration of tugboat spacecraft in formation are examined for the redirection of a near-Earth asteroid. The tugboat method uses a gimballed thruster with a highly collimated ion beam to generate a thrust on the asteroid. The target asteroid range focuses on near-Earth asteroids smaller than 150 m in diameter, and carbonaceous (C-type) asteroids, due to the volatiles available for in-situ utilization. The assessment focuses primarily on the three key parameters, i.e., the asteroid mass redirected, the timeframe for redirection, and the overall system cost. An evaluation methodology for each parameter is discussed in detail, and the parameters are employed to determine the expected return and feasibility of the redirection mission. The number of spacecraft employed is optimized along with the electrical power needed for each spacecraft to ensure the highest possible return on investment. A discussion of the optimization results and the benefits of spacecraft formation for the tugboat method are presented.
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| 6. |
- Bohra, Murtaza M., et al.
(författare)
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CPG-based online trajectory generation for quadruped rovers
- 2016
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Ingår i: 2015 IEEE International Conference on Robotics and Biomimetics (ROBIO). - Piscataway, NJ : IEEE Communications Society. - 9781467396745 ; , s. 1053-1058
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Konferensbidrag (refereegranskat)abstract
- Legged rovers are often considered as viable solutions for traversing unknown terrain. A 2D sagittal plane rover model, based on a domestic cat, is considered in this paper, and an online model-free gait planning framework is implemented using Central Pattern Generators. The framework is used to generate joint trajectories for any arbitrarily varying speed profile, and regulate locomotion transition and speed modulation, both continuously and endogenously. For a continuously changing speed profile, the gait transition is continuous as well. For a discontinuously changing speed profile, a hopping motion is observed, because the rover's thrust speed cannot increase discontinuously
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| 7. |
- Browne Mwakyanjala, Moses, et al.
(författare)
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Concurrent development and verification of an all‐software baseband for satellite ground operations
- 2020
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Ingår i: International Journal of Satellite Communications And Networking. - : John Wiley & Sons. - 1542-0973 .- 1542-0981. ; 38:2, s. 209-227
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Tidskriftsartikel (refereegranskat)abstract
- Communication systems are adopting all‐software architectures, because of their scalability, extensibility, flexibility, and cost‐effectiveness. This paper introduces a concurrent approach to the development and verification of baseband systems for satellite ground operations based on the behaviour‐driven development methodology. The open‐source GNU Radio development kit is used for developing the software‐defined radio baseband signal processing, as well as simulating the satellite and realistic channel impairments. The system performance at the end shows deviations of less than 1 dB with respect to the ideal performance and the Green Book standards specified by the Consultative Committee for Space Data Systems.
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