Rare Phase-Space Nucleation Events in GNSS Signals: Evidence from Windowed Circular Phase Analysis

This work reports the detection of rare, localized nucleation-like events in GNSS wrapped phase data using a windowed circular phase-space analysis. The events are characterized by an abrupt loss of geometric phase order, a collapse of effective oscillatory activity, and a topological reorganization of phase distributions. The phenomenon is spatially localized and robust across multiple analysis configurations, suggesting a genuine phase-space transition rather than statistical noise or instrumental artifacts.