DARPA's AtmoSense program seeks to use Earth's atmosphere as a global sensor by measuring acoustic and electromagnetic waves propagating through the atmosphere, and attempting to trace them back to a specific disturbance event that took place on Earth. In doing so, DARPA hopes to be able to trace underground explosions or other national security threats using the signals detected from the atmosphere.
https://gizmodo.com/darpa-unintentionally-invents-new-rocket-radar-thanks-to-spacex-2000584008
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