Publications

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Journals
[J44] Folta, D., and Ulrich, S., “Design and Experimental Validation of a Docking Interface for Orbital Refueling,” Acta Astronautica, accepted.
[J43] Hines, B., and Ulrich, S., “Robustified Point Cloud Global Registration via Neural Network for Close Proximity Operations,” AIAA Journal of Spacecraft and Rockets, accepted.
[J42] Arora, L., and Ulrich, S., “Koopman Expectation-Based Optimization for Offline Spacecraft Rendezvous Guidance Under Parametric Uncertainties,” AIAA Journal of Guidance, Control, and Dynamics, accepted.
[J41] Valdez Cascajares, A., Stewart, P., Tynski, L., and Ulrich, S., “Evaluation of Gradient Descent Methods on Artificial Potential Fields for Proximity Operations,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 48, No. 12, 2025, pp. 2849-2859.
[J40] Crain, A., Hovell, K., Savytska, C., and Ulrich, S., “Optimal Capture of a Spinning Spacecraft via Deep Learning Vision and Guidance,” AIAA Journal of Spacecraft and Rockets, Vol. 62, No. 5, 2025, pp. 1727-1739. Journal Page \| View PDF
[J39] Reid, N., Goodridge, R., Stewart, P., Simonson, S., Dahlseide, A., Delaney, K., Valdez Cascajares, A., Savytska, C., Crain, A., and Ulrich, S., “Computer-Vision-Driven Artificial Potential Function Guidance and Adaptive Control for Spacecraft Proximity Operations,” AIAA Journal of Aerospace Information Systems, Vol. 22, No. 8, 2025, pp.716-729. Journal Page \| View PDF
[J38] Despond, F. T., and Ulrich, S., “Real-time Stereovision-based Spacecraft Pose Determination Using Convolutional Neural Networks,” AIAA Journal of Spacecraft and Rockets, Vol. 62, No. 1, 2025, pp. 269-279. Journal Page \| View PDF
[J37] Chihabi, Y., and Ulrich, S., “Nonlinear Adaptive Angle-Only Relative Navigation on Perturbed Eccentric Orbits,” Acta Astronautica, Vol. 228, 2025, pp.494-514. Journal Page \| View PDF
[J36] Chihabi, Y., and Ulrich, S., “New Angle-Only Observability Criteria for Spaceborne Optimal Evasive Maneuvers under Perturbations,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 47, No. 7, 2024, pp. 1437-1446. Journal Page \| View PDF
[J35] Chihabi, Y., and Ulrich, S., “Software-In-The-Loop Validation of a Novel Two-Point Optimal Guidance for Perturbed Spacecraft Rendezvous and Formations,” The Journal of the Astronautical Sciences, Vol. 70, No. 5, 2023, pp. 1-45. Journal Page
[J34] Predmyrskyy, A., and Ulrich, S., “Design Heuristics and Optimization for Simple Adaptive Controllers with Applications to Spacecraft Proximity Operations,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 59, No. 3, 2023, pp. 2296-2306. Journal Page \| View PDF
[J33] Bashnick, C., and Ulrich, S., “Fast Model Predictive Control for Spacecraft Rendezvous and Docking with Obstacle Avoidance,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 46, No. 5, 2023, pp. 998-1007. Journal Page \| View PDF
[J32] Hough, J., and Ulrich, S., “Cascaded Lyapunov Vector Fields for Acceleration-Constrained Spacecraft Path Planning,” AIAA Journal of Guidance, Control, and Dynamics, Vol 45., No. 11, 2022, pp. 2076-2090. Journal Page \| View PDF
[J31] Hovell, K., and Ulrich, S., “Laboratory Experimentation of Spacecraft Robotic Capture using Deep Reinforcement Learning-based Guidance,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 45, No. 11, 2022, pp. 2138-2146. Journal Page \| View PDF
[J30] Chihabi, Y., and Ulrich, S., “Linear Time-Varying State Transition Matrix for Spacecraft Relative Dynamics on Highly Elliptical Orbits,” Acta Astronautica, Vol. 198, 2022, pp. 208-224. Journal Page
[J29] Hovell, K., Ulrich, S., and Bronz, M., “Learned Multiagent Real-Time Guidance with Applications to Quadrotor Runway Inspection,” Field Robotics, Vol. 2, 2022, pp. 1105-1133. Journal Page \| View PDF
[J28] Pothen, A. A., Crain, A., and Ulrich, S., “Pose Tracking Control for Spacecraft Proximity Operations Using the Udwadia-Kalaba Framework,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 45, No. 2, 2022, pp. 296-309. Journal Page \| View PDF
[J27] Kernot, J., and Ulrich, S., “Adaptive Control of a Tendon-Driven Manipulator for Capturing Non-Cooperative Space Targets,” AIAA Journal of Spacecraft and Rockets, Vol. 59, No. 1, 2022, pp. 111-128. Journal Page \| View PDF
[J26] Chihabi, Y., and Ulrich, S., “Perturbed State-Transition Matrix for Spacecraft Formation Flying Terminal-Point Guidance,” The Journal of the Astronautical Sciences. Vol. 68, No. 3, 2021, pp. 642-676. Journal Page \| View PDF
[J25] Chihabi, Y., and Ulrich, S., “Analytical Spacecraft Relative Dynamics with Gravitational, Drag and Third-Body Perturbations,” Acta Astronautica. Vol. 185, 2021, pp. 42-57. Journal Page \| View PDF
[J24] Shi, J.-F., Ulrich, S., and Ruel, S., “Real-time Saliency Detection for Grayscale and Colour Images,” Visual Computer. Vol. 37, No. 6, 2021, pp. 1277-1296. Journal Page \| View PDF
[J23] Shi, J.-F., and Ulrich, S., “Uncooperative Spacecraft Pose Estimation using Monocular Monochromatic Images,” AIAA Journal of Spacecraft and Rockets. Vol. 58, No. 2, 2021, pp. 284–301. Journal Page \| View PDF
[J22] Hovell, K., and Ulrich, S., “Deep Reinforcement Learning for Spacecraft Proximity Operations Guidance,” AIAA Journal of Spacecraft and Rockets. Vol. 58, No. 2, 2021, pp. 254–264. Journal Page \| View PDF
[J21] Chihabi, Y., and Ulrich, S., “Hybrid Guardian Map-based Adaptive Control of Spacecraft Formation Flying on Highly Elliptical Orbits in the Restricted Three-body Problem,” Acta Astronautica, Vol. 180, 2021, pp. 370-385. Journal Page \| View PDF
[J20] Fraser, C., and Ulrich, S., “Adaptive Extended Kalman Filtering Strategies for Spacecraft Formation Relative Navigation,” Acta Astronautica, Vol. 178, 2021, pp. 700-721. Journal Page \| View PDF
[J19] Stadnyk, K., and Ulrich, S., “Validating the Deployment of a Novel Tether Design for Orbital Debris Removal,” AIAA Journal of Spacecraft and Rockets, Vol. 57, No. 6, 2020, pp. 1335-1349. Journal Page \| View PDF
[J18] Shi, J-F., Ulrich, S., and Ruel, S., “Unsupervised Method of Infrared Spacecraft Image Foreground Extraction,” AIAA Journal of Spacecraft and Rockets, vol. 56, No. 6, 2019, pp. 1847-1856. Journal Page \| View PDF
[J17] Crain, A., and Ulrich, S., “Experimental Validation of Pseudospectral-based Optimal Trajectory Planning for Free-Floating Robots,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 42, No. 8, 2019, pp. 1726-1742. Journal Page \| View PDF
[J16] Kuiack, B., and Ulrich, S., “Nonlinear Analytical Equations of Relative Motion on J2-Perturbed Eccentric Orbits,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 41, No. 12, 2018, pp. 2666-2677. Journal Page \| View PDF
[J15] Hovell, K., and Ulrich, S., “Postcapture Dynamics and Experimental Validation of Subtethered Space Debris,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 41, No. 2, 2018, pp. 519-525. Journal Page \| View PDF Youtube
[J14] Chamitoff, G. E., Saenz-Otero, A., Katz, J. G., Ulrich, S., Morrell, B. J., Gibbens, P., “Real-time Maneuver Optimization of Space-Based Robots in a Dynamic Environment: Theory and On-Orbit Experiments,” Acta Astronautica, Vol. 142, 2018, pp. 170-183. Journal Page \| View PDF
[J13] Ulrich, S., Saenz-Otero, A., Barkana, I., “Passivity-Based Adaptive Control of Robotic Spacecraft for Proximity Operations under Uncertainties,” AIAA Journal of Guidance, Control, and Dynamics, Vol 39., No. 6, 2016, pp. 1444–1453. Journal Page \| View PDF
[J12] Fourie, D., Tweddle, B. E., Ulrich, S., and Saenz-Otero, A., “Flight Results of Vision-Based Navigation and Control for Autonomous Spacecraft Inspection of an Unknown Object,” AIAA Journal of Spacecraft and Rockets, Vol. 51, No. 6, 2014, pp. 2016–2026. Journal Page \| View PDF Youtube
[J11] Ulrich, S., Sasiadek, J. Z., and Barkana, I., “Nonlinear Adaptive Output Feedback Control of Flexible-Joint Space Manipulators with Joint Stiffness Uncertainties,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 37, No. 6, 2014, pp. 1961–1975. Journal Page \| View PDF
[J10] Flores-Abad, A., Ma, O., Pham, K., and Ulrich, S., “A Review of Space Robotics Technologies for On-Orbit Servicing,” Progress in Aerospace Sciences, Vol. 68, 2014, pp. 1–26. Journal Page \| View PDF
[J9] Ulrich, S. and Sasiadek, J. Z., “Decentralized Simple Adaptive Control of Nonlinear Systems,” International Journal of Adaptive Control and Signal Processing, Vol. 28, No. 7, 2014, pp. 750–763. Journal Page \| View PDF
[J8] Ulrich, S. and Sasiadek, J. Z., “Direct Fuzzy Adaptive Control of a Manipulator with Elastic Joints,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 36, No. 1, 2013, pp. 311–319. Journal Page \| View PDF
[J7] Ulrich, S., Sasiadek, J. Z., and Barkana, I., “Modeling and Direct Adaptive Control of a Flexible-Joint Manipulator,” AIAA Journal of Guidance, Control, and Dynamics, Vol. 35, No. 1, 2012, pp. 25–39. Journal Page \| View PDF
[J6] Ulrich, S. and Sasiadek, J. Z., “Trajectory-Tracking Control for Flexible-Joint Space Manipulators,” Canadian Aeronautics and Space Journal, Vol. 58, No. 1, 2012, pp. 47–59. Journal Page \| View PDF
[J5] Ulrich, S., Côté, J., and de Lafontaine, J., “In-Flight Attitude Perturbation Estimation for Earth-Orbiting Spacecraft,” The Journal of the Astronautical Sciences, Vol. 57, No. 3, 2009, pp. 633–665.
[J4] Ulrich, S., Landry Corbin, F., and Veilleux, J.-F., “Power System Design for ESMO,” Acta Astronautica, Vol. 64, Nos. 2-3, 2009, pp. 244–255.
[J3] Ulrich, S. et al., “Development of On-Orbit Servicing Concepts, Technology Options, and Roadmap (Part II): Technical Design,” Journal of the British Interplanetary Society, Vol. 61, No. 6, 2008, pp. 213–223.
[J2] Ulrich, S., Rasheed, A., Jones, J., and Clement, G., “Adaptation of the Vestibulo-Ocular Reflex to High g Accelerations and Pitching Motions,” Aviation, Space and Environmental Medicine, Vol. 79, No. 3, 2008, pp. 312–313.
[J1] Ulrich, S. and de Lafontaine, J., “Autonomous Atmospheric Entry on Mars: Performance Improvement Using a Novel Adaptive Control Algorithm,” The Journal of the Astronautical Sciences, Vol. 55, No. 4, 2007, pp. 431–449.