TIS-B: The ADS-B Bridge

The great promise of ADS-B is that it will eventually offer free traffic and weather services for those pilots willing to pay for the equipment and displays. But until everyone has ADS-B Out-required by 2020-a technology called TIS-B (Traffic Information Services-Broadcast) will fill the trafffic gap, allowing you to see everything ATC sees within a reasonable range of a radar site, presuming you and the radar site are suitably equipped. Lets explore how TIS-B works and how it fits into the current state of ADS-B.

Key Takeaways:

• TIS-B (Traffic Information Services-Broadcast) provides ADS-B-equipped aircraft with comprehensive traffic information by gathering and broadcasting non-ADS-B radar and WAM targets.
• The service is activated by an ADS-B Out transmitting aircraft (client) within a defined "hockey puck" service volume, requiring adequate ground station coverage and radar/WAM data.
• TIS-B is intended for enhancing situational awareness and aiding visual "see and avoid" responsibilities, not for collision avoidance, and passive receivers may experience a false sense of security by only seeing traffic relative to an active client.

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