DSFB-RF Structural Semiotics Engine for RF Signal Monitoring - A Deterministic, Non-Intrusive Observer Layer for Typed Structural Interpretation of IQ Residual Streams in Electronic Warfare, Spectrum Monitoring, and Cognitive Radio

DSFB does not compete with matched-filter banks, CFAR detectors, Kalman filters, or ML-based signal classifiers — it augments them. Those systems continue to operate unchanged. DSFB reads the IQ residual streams they already produce and returns a typed, deterministic, human-readable structural interpretation: whether the signal envelope is drifting outward, whether phase noise is accelerating, whether spectral occupancy is approaching its mask boundary, and whether these trajectories constitute structurally organized precursors to regime transitions. The key insight is that every RF receiver already contains a Luenberger-style observer — in its PLL discriminator, AGC tracking loop, or channel equalizer. These…