Abstract: A closed-loop physiological control method for physiological monitoring and biofeedback delivery includes obtaining physiological signals (electroencephalography signals, electrocardiography signals, eye-tracking signals, respiratory signals, or biomechanical motion signals) from physiological sensors associated with an operator during performance of a task. The method includes conditioning the physiological signals to remove artifacts, including independent component analysis for removing eye movement artifacts and muscle noise, bandpass filtering, or notch filtering. The method includes processing the physiological signals through a first model to generate physiological state embeddings. The method includes projecting the physiological state embeddings into a token space of a second model to produce projected embeddings. The method includes determining, using the second model operating on the projected embeddings and contextual information about the operator, a neurophysiological state of the operator.

Abstract: A receiving device captures sounds signals (e.g., ultrasonic) from multiple sound signal sources, selects the sound signals satisfying a reliability condition for use in determining an initial position of the receiving device relative to the corresponding sound signal sources, determines the initial position of the receiving device using multilateration of the selected sound signals, and updates the current position of the receiving device as the reliability of individual sound signals varies in the presence of dynamically changing environmental interference, multipathing, and movement between the receiving device and the sound signal sources.

Abstract: A receiving device captures sounds signals (e.g., ultrasonic) from multiple sound signal sources, selects the sound signals satisfying a reliability condition for use in determining an initial position of the receiving device relative to the corresponding sound signal sources, determines the initial position of the receiving device using multilateration of the selected sound signals, and updates the current position of the receiving device as the reliability of individual sound signals varies in the presence of dynamically changing environmental interference, multipathing, and movement between the receiving device and the sound signal sources.