Original title: DewTwin-Coin: an onboard autonomous framework for lunar water-ice prospecting using Chandrayaan-3 LIBS and ChaSTE data
Soundarya R., Debasish Mondal · September 2026
Future moon bases will need water-ice from lunar soil. However, rovers face big communication delays from Earth, low data bandwidth, and tight power limits. Waiting for commands from mission control wastes precious time and energy. To fix this, researchers created DewTwin-Coin. It is a system that lets a rover spot water-ice on its own in real time without drilling. The system checks two physics rules: water-ice remains stable only if the ground temperature is below 110 K and the Hydrogen-to-Oxygen signal ratio falls between 1.7 and 2.3. Testing it on real Moon mission data showed it could quickly check thousands of spots. It found no strong water-ice signals, matching the original mission results. This setup prevents rovers from wasting power by drilling in warm areas where ice cannot survive.
Imagine you are searching for a cool, damp spot in a desert. You know that such a spot must be below a certain temperature and have a specific moisture level. But you cannot test every patch of sand because you have limited time and water. In this paper, the rover uses two clues—temperature and the ratio of hydrogen to oxygen in the soil—to decide if water-ice might be present, just like you would check temperature and moisture before digging.
Future lunar bases need water-ice, but drilling blindly wastes power and risks false alarms. This framework lets a rover decide where to dig in real time, using only temperature and hydrogen readings. It saves communication delays and ensures drilling only happens where ice is stable.
The abstract doesn't explicitly state limitations, but it notes that validation was on Chandrayaan-3 data with no water-ice found, so the framework's ability to detect actual water-ice remains untested. Performance was measured on a 16 GB RAM system, not on resource-constrained rover hardware.
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DewTwin-Coin: an onboard autonomous framework for lunar water-ice prospecting using Chandrayaan-3 LIBS and ChaSTE data — Soundarya R., Debasish Mondal
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.