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Skyfall: Signal Fusion from a Smartphone Falling from the Stratosphere

2022; Multidisciplinary Digital Publishing Institute; Volume: 3; Issue: 2 Linguagem: Inglês

10.3390/signals3020014

2624-6120

Milton Garcés, Daniel Bowman, Cleat Zeiler, Anthony Christe, Tyler Yoshiyama, Brian P. Williams, Meritxell Colet, Samuel Kei Takazawa, Sarah K. Popenhagen,

Indoor and Outdoor Localization Technologies

A smartphone plummeted from a stratospheric height of 36 km, providing a near-real-time record of its rapid descent and ground impact. An app recorded and streamed useful internal multi-sensor data at high sample rates. Signal fusion with external and internal sensor systems permitted a more detailed reconstruction of the Skyfall chronology, including its descent speed, rotation rate, and impact deceleration. Our results reinforce the potential of smartphones as an agile and versatile geophysical data collection system for environmental and disaster monitoring IoT applications. We discuss mobile environmental sensing capabilities and present a flexible data model to record and stream signals of interest. The Skyfall case study can be used as a guide to smartphone signal processing methods that are transportable to other hardware platforms and operating systems.