Japanese scientists test cosmic ray GPS that works through walls and underwater

While the global position system has become a mainstay for navigation, tracking, and mapping across general-use applications, it fails to perform under certain conditions.

“Cosmic-ray muons fall equally across the Earth and always travel at the same speed regardless of what matter they traverse, penetrating even kilometres of rock,” explained paper co-author Hiroyuki Tanaka. Muon-based imaging typically requires using gases that result in a flash of light when cosmic rays move through them.This process is similar to X-ray imaging or ground-penetrating radar. However, those methods require emitting X-rays or radio waves, while muons occur naturally.

The Japanese team successfully trialled a wired version of its system in Tokyo Bay in 2021, using ten muon receivers in the Tokyo Bay Aqua-Line roadway, 45 metres below sea level.The team has also used aboveground sensors to map the vertical profile of a cyclone.The latest version of their system — the muometric wireless navigation system — is entirely wireless and features high-precision quartz clocks to sync the ground stations with the receivers.

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