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SIF #2: 5 - Autonomous Navigation System (for high altitude ballons)

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Autonomous Navigation System for High Altitude Balloons, innovation project by Ph.D. candidate Kanika Garg, main supervisor Prof Reza Emami, assistant supervisor prof. Thomas Kuhn and SSC coordinator Kent Anderson, systems engineer.

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SIF #2: 5 - Autonomous Navigation System (for high altitude ballons)

  1. 1. Autonomous Navigation System for High Altitude Balloons (ANSHAB) Kanika Garg Ph.D. Candidate, On-board Space Systems Email: Kanika.garg@ltu.se Main Supervisor Prof. Reza Emami Onboard Space Systems SSC Coordinator Kent Anderson Systems Engineer Assistant Supervisor Prof. Thomas Kuhn May 10, 2016
  2. 2. Presentation Outline • Problem Definition • State of the Art • Status Quo at SSC • Customer Needs • Project Work Packages • Progress to Date
  3. 3. Problem Definition (1)
  4. 4. Problem Definition (2)
  5. 5. Problem Definition (3)
  6. 6. State of the Art Systems Duration of flight Efficiency (mass and volume) Customer needs satisfaction Comments Ballast and bleed No No No Thermal regulation Yes No Not exactly Propulsion based altitude control Yes No No Aerodynamics altitude control Yes No No Present design not usable Cryogenic altitude control No Yes No Air ballasting Yes Yes No Tested for low altitudes Fluid vaporization Yes No No Direct compression No Yes Yes
  7. 7. Status Quo at SSC • SSC has no tools for preliminary prediction of balloon flight trajectories. • All the operations on the balloon are done manually (ballasting, valving, etc.) • Rudimentary wind data are used from online models for estimation of winds. • Winds are explored by using the balloon as a probe itself during ascent and descent. • During the turn-around flight, balloon operators are completely blind as there are no predictions available.
  8. 8. Customer Needs • Balloon Simulation Software: • Detailed Atmospheric Models: • Detailed Wind Models: • Autonomous Navigation System: • Semi-Autopilot System:  On/Off-line data for flight trajectory analysis  Predictions at a few meters around the balloon  On/Off-line data for flight parameters analysis  Capable of pre-flight analysis along with parameter variation  Localisation and Mapping  Decision making system onboard  Acceleration and deceleration of the balloon system  Recommendations  Emulation of manual pilot behavior
  9. 9. Work Packages Balloon Simulation Software and Verification Atmospheric Model Wind Model Analysis Development of Semi-Autopilot System Development of Autonomous Navigation System Verification and Validation Synthesis
  10. 10. Forces acting on a balloon and heat transfer into and out of a balloon (Source:Yajima, 2009) Balloon Simulation (1) General Concept
  11. 11. Balloon Simulation (2) • 3 degrees of freedom • 4 balloon shapes (spherical, oblate, prolate, airship) • 3 different balloon types (zero-pressure, super- pressure, overpressurized zero pressure balloon) • Earth’s atmospheric profile + Winds • 2 thermal models (Farley, 2005 + Yajima, 2009)
  12. 12. Balloon Simulation (3) Verification (Altitude Profile) Comparison with ACHAB (left) – Palumbo et al. (2007)
  13. 13. Balloon Simulation (4) Verification (Rate of Climb) Comparison with ACHAB (left) – Palumbo et al. (2007)
  14. 14. Progress to Date 1. Design and verification of the tool capable of simulating balloon trajectory 2. GUI development 3. Interfacing of the tool with other SSC modules 1. Completed 2. On-going 3. Future 1. Selection of the wind model 2. Interfacing the model with GUI and SSC software 1. On-going 2. Future 1. Selection of the atmospheric model 2. Interfacing the model with GUI and SSC 1. On-going 2. Future Balloon Simulation Software and Verification Atmospheric Model Wind Model
  15. 15. Progress to Date Development of Autopilot System Development of Autonomous Navigation System Verification and Validation 1. Study of previous flights and their operation 2. Defining the rules 3. Development of the system 1. Completed 2. Ongoing 3. Future 1. Development of onboard trajectory estimator 2. Selection and designing of sensors 3. Development of navigation module 1. Ongoing 2. Future 3. Future Ongoing
  16. 16. Thank You ! Any Questions
  17. 17. 1. Design and verification of the tool capable of simulating balloon trajectory 2. GUI development 3. Interfacing of the tool with other SSC modules 1. Selection of the atmospheric model 2. Interfacing the model with GUI and SSC 1. Selection of the wind model 2. Interfacing the model with GUI and SSC software 1. Study of previous flights and their operation 2. Defining the rules 3. Development of the system 1. Development of onboard trajectory estimator 2. Selection and designing of sensors 3. Devleopment of navigation module 1. Completed 2. Ongoing 3. Future 1. Ongoing 2. Future 1. Ongoing 2. Future 1. Completed 2. Ongoing 3. Future 1. Ongoing 2. Future 3. Future Balloon Simulation Software Atmospheric Model Wind Model Autopilot system Navigation System Work Flow
  18. 18. Customer Needs (2) Autonomous Navigation System: Designed system shall be able to use more input variables simultaneously and shall provide more accurate controlled balloon missions from an operational point of view. Semi-autopilot System : Decision making system onboard that can help in semi-autonomous piloting of the balloon. That is : 1. System shall actively accelerate and deccelerate the balloon system 2. System shall be capable of making recommendations for the efficient flight 3. System shall be capable of emulating behaviour of mannual pilots and shall be redundant System shall be capable of determining trajectory onboard on the basis of sensor readings and it shall have an on-board health monitoring system.

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