ESM (Electronic Support Measures)

1. Conceptual Intuition (L1)

• Passive Listening ("Fox Hunting").
• Direction Finding (Where is it coming from?).
• Identifying the threat (Is it a SAM or an Airport Radar?).

2. Engineering Math (L2)

• Angle of Arrival (AOA) interferometry.
• Time Difference of Arrival (TDOA) geometry.
• The "Ellipse of Uncertainty".

3. System Application (L3)

• Pulse Descriptor Words (PDWs).
• Deinterleaving pulse trains.
• Specific Emitter Identification (SEI) using "fingerprints".

Interactive Component: TDOA Geometry Solver

• Description: Triangulate a signal source.
• Controls: Number of Sensors, Timing Error, Baseline.