01.2 Surveillance Systems
1. Overview
Modern ATC surveillance integrates multiple systems to provide accurate aircraft position data.
2. SSR Modes
Mode A
- 4-digit squawk code
Mode C
- Pressure altitude
Mode S
- Unique aircraft identification
- Enhanced data capability
3. ADS-B
Definition
Automatic Dependent Surveillance – Broadcast
Characteristics
- GPS-based position
- High accuracy
- No interrogation required
4. Multilateration (MLAT)
- Uses multiple ground stations
- Calculates aircraft position via time difference
5. System Integration
Controllers must understand:
- Data reliability differences
- Update rates
- Potential discrepancies between sources