Optimal control of a space-borne laser system for a 100 m asteroid deflection under uncertainties

Massimo Vetrisano, Juan L. Cano, Nicolas Thiry, Chiara Tardioli, Massimiliano Vasile

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)

Abstract

The paper demonstrates the technical feasibility to deflect a 100 m diameter asteroid using a moderate size spacecraft carrying a 1-20 kW solar-powered class laser. To this purpose, a recent model of the laser ablation mechanism based on the characteristics of both the laser systems and the asteroid has been used to calculate the exerted thrust in terms of direction and magnitude. This paper shows a preliminary deflection uncertainty analysis for two different control logic and assuming different laser mechanism capabilities. In particular, an optimal thrust control direction and fixed laser pointing strategies were considered with two laser optics settings: the first maintaining the focus length fixed and the second able to exactly focus on the surface. Preliminary results show that in general the fixed laser pointing strategy at low power is less able to impart high deflection. Nonetheless, when the power increases, the optimal thrust method produces undesired torques, which reduces the laser momentum coupling as side effects. However, the overall efficiency is higher in the optimal thrust case. Since the collision risk between an impacting asteroid and the Earth depends on the probability distribution of the input uncertainty parameters, it is necessary to study how the overall deflection will be affected. Both aleatory and epistemic uncertainties are taken into account to evaluate the probability of success of the proposed deflection methods.

LanguageEnglish
Title of host publicationAerospace Conference, 2016 IEEE
Place of PublicationPiscataway
PublisherIEEE
Number of pages13
ISBN (Print)9781467376761
DOIs
Publication statusPublished - 27 Jun 2016
Event2016 IEEE Aerospace Conference, AERO 2016 - Big Sky, United States
Duration: 5 Mar 201612 Mar 2016

Conference

Conference2016 IEEE Aerospace Conference, AERO 2016
CountryUnited States
CityBig Sky
Period5/03/1612/03/16

Fingerprint

spaceborne lasers
Asteroids
optimal control
asteroids
deflection
asteroid
laser
Lasers
lasers
thrust
Laser optics
thrust control
Uncertainty analysis
Laser ablation
Probability distributions
Spacecraft
Uncertainty
Momentum
uncertainty analysis
Torque

Keywords

  • laser modes
  • laser ablation
  • laser beams
  • power lasers
  • space vehicles
  • torque
  • asteroids
  • astronomical techniques
  • celestial mechanics
  • optimal control
  • statistical distributions

Cite this

Vetrisano, M., Cano, J. L., Thiry, N., Tardioli, C., & Vasile, M. (2016). Optimal control of a space-borne laser system for a 100 m asteroid deflection under uncertainties. In Aerospace Conference, 2016 IEEE [7500677] Piscataway: IEEE. https://doi.org/10.1109/AERO.2016.7500677
Vetrisano, Massimo ; Cano, Juan L. ; Thiry, Nicolas ; Tardioli, Chiara ; Vasile, Massimiliano. / Optimal control of a space-borne laser system for a 100 m asteroid deflection under uncertainties. Aerospace Conference, 2016 IEEE. Piscataway : IEEE, 2016.
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author = "Massimo Vetrisano and Cano, {Juan L.} and Nicolas Thiry and Chiara Tardioli and Massimiliano Vasile",
note = "(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.",
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Vetrisano, M, Cano, JL, Thiry, N, Tardioli, C & Vasile, M 2016, Optimal control of a space-borne laser system for a 100 m asteroid deflection under uncertainties. in Aerospace Conference, 2016 IEEE., 7500677, IEEE, Piscataway, 2016 IEEE Aerospace Conference, AERO 2016, Big Sky, United States, 5/03/16. https://doi.org/10.1109/AERO.2016.7500677

Optimal control of a space-borne laser system for a 100 m asteroid deflection under uncertainties. / Vetrisano, Massimo; Cano, Juan L.; Thiry, Nicolas; Tardioli, Chiara; Vasile, Massimiliano.

Aerospace Conference, 2016 IEEE. Piscataway : IEEE, 2016. 7500677.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AU - Vasile, Massimiliano

N1 - (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

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N2 - The paper demonstrates the technical feasibility to deflect a 100 m diameter asteroid using a moderate size spacecraft carrying a 1-20 kW solar-powered class laser. To this purpose, a recent model of the laser ablation mechanism based on the characteristics of both the laser systems and the asteroid has been used to calculate the exerted thrust in terms of direction and magnitude. This paper shows a preliminary deflection uncertainty analysis for two different control logic and assuming different laser mechanism capabilities. In particular, an optimal thrust control direction and fixed laser pointing strategies were considered with two laser optics settings: the first maintaining the focus length fixed and the second able to exactly focus on the surface. Preliminary results show that in general the fixed laser pointing strategy at low power is less able to impart high deflection. Nonetheless, when the power increases, the optimal thrust method produces undesired torques, which reduces the laser momentum coupling as side effects. However, the overall efficiency is higher in the optimal thrust case. Since the collision risk between an impacting asteroid and the Earth depends on the probability distribution of the input uncertainty parameters, it is necessary to study how the overall deflection will be affected. Both aleatory and epistemic uncertainties are taken into account to evaluate the probability of success of the proposed deflection methods.

AB - The paper demonstrates the technical feasibility to deflect a 100 m diameter asteroid using a moderate size spacecraft carrying a 1-20 kW solar-powered class laser. To this purpose, a recent model of the laser ablation mechanism based on the characteristics of both the laser systems and the asteroid has been used to calculate the exerted thrust in terms of direction and magnitude. This paper shows a preliminary deflection uncertainty analysis for two different control logic and assuming different laser mechanism capabilities. In particular, an optimal thrust control direction and fixed laser pointing strategies were considered with two laser optics settings: the first maintaining the focus length fixed and the second able to exactly focus on the surface. Preliminary results show that in general the fixed laser pointing strategy at low power is less able to impart high deflection. Nonetheless, when the power increases, the optimal thrust method produces undesired torques, which reduces the laser momentum coupling as side effects. However, the overall efficiency is higher in the optimal thrust case. Since the collision risk between an impacting asteroid and the Earth depends on the probability distribution of the input uncertainty parameters, it is necessary to study how the overall deflection will be affected. Both aleatory and epistemic uncertainties are taken into account to evaluate the probability of success of the proposed deflection methods.

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KW - statistical distributions

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