Gilbert Bahati
Gilbert Bahati
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I am a PhD candidate in Mechanical Engineering at the California Institute of Technology (Caltech) and part of the AMBER Lab, advised by Dr. Aaron D. Ames. My research is focussed on nonlinear control applied to robotic systems.
Prior to coming to Caltech, I obtained my BS in Civil Engineering (Systems) at the University of California, Berkeley (UC Berkeley). While there, I was part of the Berkeley Artificial Intelligence Research (BAIR) Lab and worked with Dr. Alexandre M. Bayen on optimal control applied to mixed-autonomy traffic using conservation laws (PDEs) and FLOW - I was a member of the CIRCLES project.
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Research
Research
Control Barrier Function Synthesis for Nonlinear Systems with Dual Relative Degree
Gilbert Bahati, Ryan K. Cosner, Max H. Cohen, Ryan M. Bena, Aaron D. Ames
2025, In Review
We provide a constructive framework for synthesizing CBFs for systems with dual relative degree—where different inputs influence the outputs at two different orders of differentiation; this is common in systems with orientation-based actuation, such as unicycles and quadrotors.
Characterizing Smooth Safety Filters via the Implicit Function Theorem
Max H. Cohen, Pio Ong, Gilbert Bahati, Aaron D. Ames
2024, IEEE Control Systems Letters (L-CSS).
We present a general characterization of smooth safety filters – smooth controllers that guarantee safety in a minimally invasive fashion – based on the Implicit Function Theorem. This characterization leads to families of smooth universal formulas for safety-critical controllers that quantify the conservatism of the resulting safety filter.
Sample-and-Hold Safety with Control Barrier Functions
Gilbert Bahati, Pio Ong, Aaron D. Ames
2024, American Control Conference (ACC).
We examine the assumption that high sampling frequency leads to minor safety violations for controllers deployed on digital platforms (i.e., zero-order hold implementations). We propose an alternative approach to maintaining safety of such systems by modulating the sampled control input to ensure a more robust safety condition - avoiding any violations.
Pio Ong, Gilbert Bahati, Aaron D. Ames
2022, 61th IEEE Conference on Decision and Control (CDC).
[pdf]
We generalize the event-triggered control concept to include state triggers where the controller can be turned off - intermittent control. Using certificate functions (Lyapunov or Barrier Functions), we show that our design of intermittent trigger laws guarantee stability or safety.
Work was done in collaboration with NASA-JPL.
Hamilton-Jacobi Reachability
Multi-Adversarial Safety Analysis for Autonomous Vehicles
Gilbert Bahati, Marsalis Gibson, Alexandre M. Bayen
2020, Robotics Science and Systems (RSS): Robust Autonomy workshop.
[pdf] / [video] / [HJ Reachability toolbox]
We study the reduction of conservativeness in Hamilton-Jacobi safety analysis by examining trade-offs between different modeling strategies.
We demonstrate how by introducing structure in the interactions between autonomous vehicles and surrounding vehicles in dense driving scenarios, we are able to uncover safe strategies.
Work was done under the CIRCLES project.
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