Acoustic Waves From a Distant Explosion Recorded on a Continuously Ascending Balloon in the Middle Stratosphere

Popenhagen, S. K.; Bowman, D. C.; Zeiler, C.; Garcés, M. A.

doi:10.1029/2023gl104031

Cited by 2 publications

References 36 publications

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RedVox: evolution and applications of a smartphone infrasound recorder

Liu,

Garces,

Christe

et al. 2024

Signal Processing, Sensor/Information Fusion, and Target Recognition XXXIII

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Attritable sensor systems with microphones are ubiquitous and can detect a variety of moving targets from ground vehicles to unmanned autonomous systems (UAS), aircraft, and spacecraft. Smartphone platforms have open data collection interfaces and can use cellular, Wi-Fi, and other public communications to relay data. In addition, acoustic signatures are more difficult to mask than transmissions in radio-frequency bands, making sound a passive complement to RF in an early warning system. This presentation discusses the development, deployment, and ongoing AI/ML work behind RedVox, a smartphone app available through the Apple App Store and Google Play Store. RedVox records data using the smartphone's onboard sensors, including the accelerometer, gyroscope, magnetometer, barometer, and microphone; these data packets can be streamed to interested parties in real-time and analyzed online using RedVox's open-source software tools. One of RedVox's unique features is the ability to collect infrasonic data at frequencies below human hearing, which has been shown to detect natural disasters, explosions, and motorized vehicles. The RedVox app is rapidly deployable at scale in regions of interest. Two current focus areas are Guam and Coconut Island in Oahu, where networks of smartphones can perform edge processing and dispersed sensing of airborne and maritime targets. The RedVox ecosystem has matured over the past decade across diverse environments and currently provides advanced edge and cloud analytics. Further development could lead to a lightweight machine learning model that flags anomalous entities for human review, offering a resilient ad hoc sensor network for defense or emergency response applications.

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RedVox: evolution and applications of a smartphone infrasound recorder

Liu,

Garces,

Christe

et al. 2024

Signal Processing, Sensor/Information Fusion, and Target Recognition XXXIII

View full text Add to dashboard Cite

show abstract

Geophysical Observations of the 2023 September 24 OSIRIS-REx Sample Return Capsule Reentry

Silber,

Bowman,

Carr

et al. 2024

Planet. Sci. J.

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Sample return capsules (SRCs) entering Earth’s atmosphere at hypervelocity from interplanetary space are a valuable resource for studying meteor phenomena. The 2023 September 24 arrival of the Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer SRC provided an unprecedented chance for geophysical observations of a well-characterized source with known parameters, including timing and trajectory. A collaborative effort involving researchers from 16 institutions executed a carefully planned geophysical observational campaign at strategically chosen locations, deploying over 400 ground-based sensors encompassing infrasound, seismic, distributed acoustic sensing, and Global Positioning System technologies. Additionally, balloons equipped with infrasound sensors were launched to capture signals at higher altitudes. This campaign (the largest of its kind so far) yielded a wealth of invaluable data anticipated to fuel scientific inquiry for years to come. The success of the observational campaign is evidenced by the near-universal detection of signals across instruments, both proximal and distal. This paper presents a comprehensive overview of the collective scientific effort, field deployment, and preliminary findings. The early findings have the potential to inform future space missions and terrestrial campaigns, contributing to our understanding of meteoroid interactions with planetary atmospheres. Furthermore, the data set collected during this campaign will improve entry and propagation models and augment the study of atmospheric dynamics and shock phenomena generated by meteoroids and similar sources.

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Acoustic Waves From a Distant Explosion Recorded on a Continuously Ascending Balloon in the Middle Stratosphere

Cited by 2 publications

References 36 publications

RedVox: evolution and applications of a smartphone infrasound recorder

RedVox: evolution and applications of a smartphone infrasound recorder

Geophysical Observations of the 2023 September 24 OSIRIS-REx Sample Return Capsule Reentry

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