Publications

    Journal Papers

  1. J.J. Le Moigne, J.C. Adams, S. Nag, "A New Taxonomy for Distributed Spacecraft Missions", IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (2020), DOI: 10.1109/JSTARS.2020.2964248 (doi)(pdf)
  2. V. Ravindra, S. Nag, "Fast Methods of Coverage Evaluation for Tradespace Analysis of Constellations", IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (2019), DOI:10.1109/JSTARS.2019.2952531 (doi)(pdf)
  3. K. Knobelspiesse, S. Nag, "Aerosol remote sensing with small satellites in formation flight", Atmospheric Measurement Techniques 11 (2018), 3935-3954, DOI:10.5194/amt-11-3935-2018 (doi)(pdf)
  4. S. Nag, A.S. Li, J.H. Merrick "Scheduling Algorithms for Rapid Imaging using Agile Cubesat Constellations", COSPAR Advances in Space Research - Astrodynamics 61, Issue 3 (2018), 891-913, DOI:10.1016/j.asr.2017.11.010 (doi)(pdf)
  5. S. Nag , T. Hewagama, G. Georgiev, B. Pasquale, S. Aslam, C. K. Gatebe, "Multispectral Snapshot Imagers onboard Small Satellite Formations for Multi-Angular Remote Sensing", IEEE Sensors Journal 17, no. 16 (2017), 5252-5268, DOI: 10.1109/JSEN.2017.2717384 (doi)(pdf)
  6. S. Nag, C.K. Gatebe, T.Hilker, "Simulation of Multiangular Remote Sensing Products Using Small Satellite Formations", IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 10, no. 2 (2017), 638-653, DOI: 10.1109/JSTARS.2016.2570683 (doi)(pdf)
  7. S. Nag, J. L. Rios, D. Gerhardt, C. Pham, "CubeSat Constellation Design for Air Traffic Monitoring", Acta Astronautica 128 (2016), 180-193, DOI:10.1016/j.actaastro.2016.07.010 (doi)(pdf)
  8. S. Nag, C.K. Gatebe, D.W. Miller, O.L. de Weck, "Effect of Satellite Formation Architectures and Imaging Modes on Global Albedo Estimation", Acta Astronautica 126 (2016), 77-97, DOI:10.1016/j.actaastro.2016.04.004 (doi)(pdf)
  9. S. Nag, C.K. Gatebe, O.L. de Weck, "Observing System Simulations for Small Satellite Formations Estimating Bidirectional Reflectance", International Journal of Applied Earth Observation and Geoinformation 43 (2015), 102-118, DOI: 10.1016/j.jag.2015.04.022 (doi)(pdf)
  10. S. Nag, J.A. Hoffman, O.L. de Weck, "Collaborative and Educational Crowdsourcing of Spaceflight Software using SPHERES Zero Robotics", International Journal of Space Technology Management and Innovation (IJSTMI), vol 2, no. 2, 2012, DOI: 10.4018/ijstmi.2012070101 (doi)(pdf)
  11. S. Nag, J.G. Katz, A. Saenz-Otero, "Collaborative Gaming and Competition for CS-STEM Education using SPHERES Zero Robotics", Acta Astronautica 83 (2013) 145-174, DOI: 10.1016/j.actaastro.2012.09.006 (doi)(pdf)
  12. S. Nag, L. Summerer, "Behavior-based, Autonomous and Distributed Scatter Manouevres for Satellite Swarms", Acta Astronautica 82 (2013) 95-109, DOI: /10.1016/j.actaastro.2012.04.030 (doi)(pdf)
  13. S. Nag, S. A. Swift, "Lateral continuity of basement seismic reflections in 15 Ma ultrafast-spreading crust at ODP Site 1256", Marine Geophysical Researches, March 2011, DOI: 10.1007/s11001-011-9122-4 (doi)(pdf)

    Peer-Reviewed Conference Papers

  14. V. Ravindra, S. Nag, "Instrument Data Metrics Evaluator for Tradespace Analysis of Earth Observing Constellations", accepted to the IEEE Aerospace Conference 2020
  15. S. Nag, A. S. Li, V. Ravindra, M. Sanchez Net, K.M. Cheung, R. Lammers, B. Bledsoe, "Autonomous Scheduling of Agile Spacecraft Constellations with Delay Tolerant Networking for Reactive Imaging", International Conference on Automated Planning and Scheduling SPARK Workshop, Berkeley CA, July 2019 (doi)(pdf)
  16. S. Nag, P. Dabney, V. Ravindra, C. Anderson, "Planning a Reference Constellation for Radiometric Cross-Calibration of Commercial Earth Observing Sensors", International Workshop on Planning and Scheduling for Space, Berkeley CA, July 2019 (doi)(pdf)
  17. A. Slavinskis, S. Nag, J. Mueting, "An Initial Analysis of the StationkeepingTradespace for Constellations", IEEE Aerospace Conference, Big Sky, Montana, March 2019 (doi)(pdf)
  18. S. Nag, V. Ravindra, J.J. LeMoigne "Instrument Modeling Concepts for Tradespace Analysis of Satellite Constellations", IEEE Sensors Conference, Delhi, India, October 2018 (doi)(pdf)
  19. S. Nag, D. Murakami, M. Lifson, P. Kopardekar "System Autonomy for Space Traffic Management", IEEE/AIAA Digital Avionics and Systems Conference, London, United Kingdom, September 2018 (doi)(pdf)
  20. S. Nag, J. Jung, K.S. Inamdar, "Communicating with Unmanned Aerial Swarms using Automatic Dependent Surveillance Transponders", IEEE Sensors Conference, Glasgow Scotland, November 2017 (doi)(pdf)
  21. J. Le Moigne, P. Dabney, O. de Weck, V. Foreman, P. Grogan, M. Holland, S. Hughes, S. Nag, "Tradespace Analysis Tool for Designing Constellations (TAT-C)", IEEE International Geoscience and Remote Sensing Symposium, Texas USA, July 2017 (doi)(pdf)
  22. S. Nag, J.J. LeMoigne, D.W. Miller, O.L. de Weck, "A Framework for Orbital Performance Evaluation in Distributed Space Missions for Earth Observation", IEEE Aerospace Conference, Big Sky, Montana, March 2015 (doi)(pdf)
  23. S. Nag, K. Cahoy, O.L. de Weck, "Subsystem Support Feasibility for Formation Flight measuring Bi-Directional Reflectance", IEEE Aerospace Conference, Big Sky, Montana, March 2015 (doi)(pdf)
  24. S. Nag, C.K. Gatebe, T. Hilker, F.G. Hall, L.P. Dyrud, O.L. de Weck, "Gross Primary Productivity Estimation using Multi-Angular Measurements from Small Satellite Clusters", IEEE International Geoscience and Remote Sensing Symposium, July 2014 (doi)(pdf)(video)
  25. S. Nag, C.K. Gatebe, O.L. de Weck, "Relative Trajectories for Multi-Angular Earth Observation using Science Performance Optimization", IEEE Aerospace Conference, Big Sky, Montana, March 2014 (doi)(pdf)
  26. S. Nag, J.J. LeMoigne, O.L. de Weck "Cost and Risk Analysis of Small Satellite Constellations for Earth Observation", IEEE Aerospace Conference, Big Sky, Montana, March 2014 (doi)(pdf)
  27. S. Nag, I. Heffan, A. Saenz-Otero, M. Lydon, "SPHERES Zero Robotics software development: Lessons on crowdsourcing and collaborative competition", IEEE Aerospace Conference, Big Sky, Montana, March 2012 (doi)(pdf)
  28. S. Nag, E. Gomez, S. Feller, J. Gibbs, J.A. Hoffman, "Laser Communication System Design for the Google Lunar X-Prize", IEEE Aerospace Conference, Big Sky, Montana, March 2011 (doi)(pdf)

    Theses

  29. S. Nag, "Design and Evaluation of Distributed Spacecraft Missions for Multi-Angular Earth Observation", PhD thesis submitted in partial fulfilment of the degree of 'Space Systems Engineering', Massachusetts Institute of Technology, Cambridge, U.S.A. 2015 (doi)(pdf)
  30. S. Nag, "Collaborative Competition for Crowdsourcing Spaceflight Software and STEM Education using SPHERES Zero Robotics", Dual Masters' thesis submitted in partial fulfilment of the degree of 'Aeronautics and Astronautics' and 'Technology and Policy', Massachusetts Institute of Technology, Cambridge, U.S.A. 2012 (doi)(pdf)
  31. S. Nag, "Prediction and Modeling of the San Francisco Bay area transients using Synthetic Aperture Radar Time Series" , Masters' thesis submitted in partial fulfilment of the degree of 'Exploration Geophysics', Indian Institute of Technology, Kharagpur, India 2009.

    Conference Proceeedings

  32. S. Nag, D. Murakami, N. Marker, M. Lifson, P. Kopardekar, "Prototyping Operational Autonomy for Space Traffic Management", International Astronautical Congress, Washington DC, October 2019 (pdf)(prez)
  33. D. Murakami, S. Nag, M. Lifson, P. Kopardekar, "Space Traffic Management with a NASA UAS Traffic Management (UTM) Inspired Architecture", AIAA Science and Technology Forum and Exposition (AIAA SciTech), San Diego USA, January 2019 (doi)(pdf)
  34. J. Cabrera, S. Nag, D. Murakami, "An Initial Analysis of Automating Conjunction Assessment and Collision Avoidance Planning in Space Traffic Management", AAS/AIAA Space Flight Mechanics Meeting, Hawaii USA, January 2019 (doi)(pdf)
  35. J. Jung, C.R. Drew, S. Nag, E.O. Torres, A.K. Ishihara, M. Do, H.C. Modi, "Initial Approach to Collect Small Unmanned Aircraft System Off-nominal Operational Situations Data", AIAA Aviation, Atlanta Georgia, June 2018 (doi)(pdf)
  36. S. Nag, S.P. Hughes, J.J. Le Moigne "Navigating the Deployment and Downlink Tradespace for Earth Imaging Constellations", International Astronautical Congress, Adelaide, Australia, September 2017 (doi)(pdf)(prez)
  37. S. Nag, Alan S. Li "Scheduling for Rapid Response Imaging using Agile, Small Satellite Constellations", IAA Symposium on Small Satellites for Earth Observation, Berlin, Germany, April 2017 (pdf)(prez)
  38. S. Nag, "Sensor Webs of Agile, Small Satellite Constellations and Unmanned Aerial Vehicles with Satellite-to-Air Communication Links", IAA Latin American Symposium on Small Satellites - Advanced Technologies and Distributed Systems, Buenos Aires, Argentina, March 2017 (doi)(prez)
  39. S. Nag, S.P. Hughes, J.J. Le Moigne, "Streamlining the Design Tradespace for Earth Imaging Constellations", AIAA Space Conference, Long Beach California, September 2016 (doi)(pdf)
  40. S. Nag, J.L. Rios, D. Gerhardt, C. Pham, "CubeSat Constellation Design for Air Traffic Monitoring", International Astronautical Congress, Jerusalem, Israel, October 2015 (doi)(prez)(pdf)
  41. S. Nag, C.K. Gatebe, D.W. Miller, O.L. de Weck, "Effect of Satellite Formation Architectures and Imaging Modes on Albedo Estimation of major Biomes", International Astronautical Congress, Toronto, Canada, September 2014 (doi)(prez)(pdf)
  42. S. Nag, "Satellite Constellation Mission Design using Model-Based Systems Engineering and Observing System Simulation Experiments", AIAA/USU Small Satellite Conference, Logan, Utah, August 2014 (pdf)(prez)
  43. S. Nag, O.L. de Weck, D.W. Miller, "Maintenance Feasibility of a Small Satellite Cluster making Bi-Directional Reflectance Measurements", 4S - Small Satellites, Systems and Services Symposium, Mallorca, Spain, May 2014
  44. S. Nag, "Design and Analysis of Distributed Nano-Satellite Systems for Multi-Angular, Multi-Spectral Earth Observation", International Astronautical Congress, IAC-13-B4.7.2, Beijing, China, September 2013 (doi)
  45. S. Nag, K. Cahoy, O.L. de Weck, C.K. Gatebe, G. Georgiev, T. Hewagama, S. Aslam, B. Pasquale "Evaluation of Hyperspectral Snapshot Imagers onboard Nanosatellite Clusters for Multi-Angular Remote Sensing", AIAA Space Conference, San Diego, California, September 2013 (doi)(pdf) (prez)
  46. S. Nag, "Design of Nano-satellite Cluster Formations for Bi-Directional Reflectance Distribution Function (BRDF) Estimations", AIAA/USU Small Satellite Conference, Logan, Utah, August 2013 (pdf)(prez)
  47. S. Nag, O.L. de Weck, "Tradespace Exploration of Distributed Nanosatellite Formations for BRDF Estimation", International Workshop on Satellite Constellation and Formation Flying (IWSCFF), Lisbon, Portugal, March 2013
  48. S. Nag, J.G. Katz, A. Saenz-Otero, "SPHERES Zero Robotics: Education using Games", International Astronautical Congress, IAC-11-E1-5.4, Cape Town, South Africa, October 2011 (doi)(pdf)
  49. S. Nag, L. Summerer, O.L. de Weck, "Autonomous and Distributed Collision Avoidance Maneuvers for Fractionated Spacecrafts", International Workshop on Satellite Constellation and Formation Flying (IWSCFF), Taipei, Taiwan, October 2010 (pdf)
  50. M.G. O'Neill, H.Yue, S. Nag, P.Grogan, O. de Weck, "Comparing and Optimizing the DARPA System F6 Program Value-Centric Design Methodologies", AIAA Space, Anaheim, California 2010 (doi)(pdf)

    Conference Presentations and Invited Talks

  51. S. Nag, "Autonomous Systems in Space", MIT Faculty Forum, December 2019
  52. S. Nag, A. S. Li, V. Ravindra, M. Sanchez Net, K. Cheung, R. W. Lammers, B. P. Bledsoe, "Autonomous Scheduling of Agile Spacecraft Constellations with Delay Tolerant Networking for Monitoring Transient Precipitation and Urban Floods", American Geophysical Union Fall Meeting, San Francisco CA, December 2019 (prez)
  53. S. Nag, "Distributed Spacecraft Autonomy for Earth Observation",Stevens Institute of Technology Systems Engineering Seminar, Hoboken NJ, October 2019
  54. S. Nag, G. Apaza, P. W. Dabney, O. L. de Weck, V. Foreman, P. T. Grogan, M. P. Holland, S. P. Hughes, A. Siddiqi, J. P. Verville, J. Le Moigne, "Constellation Operations and Instrument Analysis for Earth Science Missions using TAT-C", NASA Earth Science Technology Forum, Moffet Field CA, June 2019 (doi)
  55. S. Nag, "Distributed Spacecraft Autonomy for Earth Observation", Stanford University Earth Systems Departmental Seminar, Palo Alto CA, June 2019
  56. S. Nag, A. S. Li, V. Ravindra, M. Sanchez Net, K.M. Cheung, R. Lammers, B. Bledsoe, "Autonomous Scheduling of Agile Spacecraft Constellations with Delay Tolerant Networking for Reactive Imaging", Tactical Fire Remote Sensing Advisory Committee (TFRSAC) Spring Meeting, Moffet Field CA, June 2019
  57. E. Kim, B. Forman, L. Wang, J. Lemoigne-Stewart, S. Nag, "Toward Global Snow From Space: Coverage of Snow Observation Constellation Configurations", ESA Living Planet Symposium, Milan Italy, May 2019(doi)
  58. S. Nag, D. Murakami, M. Lifson, J. Cabrera, P. Kopardekar, "A Concept for Civil Space Traffic Management", AIAA Small Satellite Conference, Logan, USA, August 2018 (prez)
  59. S. Nag, "Autonomous Scheduling Requirements for Agile Cubesat Constellations in Earth Observation", COSPAR General Assembly, Pasadena CA, July 2018 (doi)(prez)
  60. S. Nag, "Autonomous Scheduling of Agile Spacecraft Constellations for Rapid Response Imaging", NASA Earth Science Technology Forum, Silver Spring MD, June 2018 (doi)(prez)
  61. S. Nag, "Autonomous Scheduling of Agile Spacecraft Constellations for Rapid Response Imaging", Stanford University Robotics Seminar, Palo Alto CA, May 2018 (doi)
  62. B. Forman, S. Kumar, J.J. LeMoigne, S. Nag, "Towards the Development of a Global, Satellite-based, Terrestrial Snow Mission Planning Tool", 74th Eastern Snow Conference, Ottawa Canada, June 2017
  63. S. Nag, "Small Satellites, Large Numbers", Indian Institute of Technology, Bombay, India, January 2017. Also presented as an award acceptance speech at Indian Institute of Science Education and Research, Pune, January 2017 (prez)
  64. S. Nag, "Small Satellites, Large Numbers" and "Multi-Angular Remote Sensing with Small Satellite Formations", Skolkovo Insitute of Technology, Moscow, Russian Federation, December 2016
  65. S. Nag, "Small Satellites, Large Numbers", Johns Hopkins University, Applied Physics Lab, Laurel, Maryland USA, July 2016
  66. S. Nag, "Cubesats for Earth Science Applications", Tactical Fire Remote Sensing Advisory Committee (TFRSAC) Spring Meeting, Moffet Field California, May 2016
  67. K. Knobelspiesse, S. Nag, "Aerosol Remote Sensing with Small Satellites in Formation Flight", Yoram Kaufman Memorial Symposium, NASA Goddard Space Flight Center, Greenbelt Maryland, June 2016 (doi)(prez)
  68. J.J. Le Moigne, P. Dabney, O. de Weck, V. Foreman, P. Grogan, M. Holland, S. Hughes, S. Nag, "TAT-C: A Trade-space Analysis Tool for Constellations", NASA Earth Science Technology Forum, Annapolis, Maryland USA, June 2016 (doi)(prez)
  69. S. Nag, "Small Satellite Constellation Design using Systems Engineering coupled with Observing System Simulations", Nanyang Technological University, Singapore, February 2016
  70. S. Nag, "Small Satellite Constellation Design using Systems Engineering coupled with Observing System Simulations", George Washington University, Washington DC, December 2015
  71. S. Nag, "Small Satellite Constellation Design using Systems Engineering coupled with Observing System Simulations", Weizmann Institute of Science, Rehovot Israel, October 2015
  72. S. Nag, C.K. Gatebe, T. Hilker, F.G Hall, O.L. de Weck, "Measuring Bi-Directional Reflectance for Gross Primary Productivity with a Constellation of SmallSats", American Geophysical Union Fall Meeting, California USA, December 2014 (doi)
  73. S. Nag, C.K. Gatebe, W. Wiscombe, O.L. de Weck, "Measuring Bi-Directional Reflectance with a Constellation of SmallSats", American Geophysical Union Fall Meeting, California USA, December 2013 (doi)
  74. L.P. Dyrud, W.J. Wiscombe, S. Nag, S.R. Lorentz, K.E. Trenberth, J.C. Chiu, W.B. Rossow, S.E. Schwartz, W.H. Swartz, " Solving climate uncertainty one tiny satellite at a time: Earth's Radiation Imbalance System", American Geophysical Union Fall Meeting, California USA, December 2013 (doi)
  75. S. Nag, "Design and Evaluation of Distributed Space Missions for Multi-Angular Earth Observation", University of Massachusetts Boston, Massachusetts USA, March 2013

    Poster Presentations

  76. S. Nag, A. S. Li, V. Ravindra, M. Sanchez Net, K.M. Cheung, R. Lammers, B. Bledsoe, "Autonomous Scheduling of Agile Spacecraft Constellations with Delay Tolerant Networking for Reactive Imaging", NASA Earth Science Technology Forum, Moffet Field CA, June 2019
  77. S. Nag, A.S. Li, "Optimizing the Attitude Control of Small Satellite Constellations for Rapid Response Imaging", American Geophysical Union Fall Meeting, California USA, December 2016 and NASA ARC Earth Science Poster Session, February 2017 (poster)
  78. S. Nag, C.K. Gatebe, O.L. de Weck, "Nanosatellite clusters for Multi-spectral, Bi-directional Reflectance Distribution Function Estimations", United Nations Nanosatellite Symposium, Nagoya, Japan, October 2012 (poster)
  79. S. Nag, J.P. Canales, "Waveform Tomography and its Application to Marine Seismic Refraction Data from the Trans-Atlantic Geotraverse", American Geophysical Union Joint Assembly, Florida USA, May 2008 (doi)(poster) (pdf)
  80. S. Nag, S. A. Swift, R.A. Stephen, "Using the IODP Expedition 312 Vertical Seismic Profile to investigate to investigate sub-basement Reflections in multi-channel profiles", American Geophysical Union Joint Assembly, Florida USA, May 2008 (doi)(poster) (pdf)
  81. S. Nag, A.K. Ray, T. Chaira, "Fuzzy Multimodal Segmentation: An application to planetary images", International Conference on Terrestrial Planets: Evolution through time at PRL (ISRO), Ahmedabad, India, January 2008 (poster)