ADS-B Vehicle Transponders：VAT140

The VAT140 appears to be a type of ADS-B (Automatic Dependent Surveillance-Broadcast) transponder system used in vehicles, likely for ground vehicle tracking applications. 

Key Features of VAT140 and Similar Vehicle ADS-B Transponders:

• ADS-B Technology: Uses the same 1090MHz frequency band as aircraft transponders to broadcast position data.
• Vehicle Applications: Typically used for:
• Airport ground vehicle tracking
• Construction vehicle monitoring at airfields
• Special vehicle tracking in controlled areas

Typical Capabilities:

• GPS-derived position reporting
• Speed and heading transmission
• Unique vehicle identification
• May include additional data like vehicle status

Safety Benefits:

• Improves situational awareness for air traffic controllers
• Helps prevent runway incursions
• Enhances overall airport surface safety