ADS-B Webinar (PDF) - Avidyne

Why is an Active Traffic System still important?• Active Traffic Systems (TAS, TCAS) use Mode-A, C,or S transponder interrogations to determinebearing, distance, and altitude• Aircraft will still be required to have Mode C or S transponder• 3 reasons Active Traffic is still valuable:1. Through 2020 will have mixed equipage environment2. ADS-R and TIS-B not guaranteed to existing in all areas evenafter 2020 and have latency and update rate issues3. Active traffic is independent of GPS – during periods of poorsatellite geometry or solar storms ADS-B accuracy may degrade.FAA is using SSR as backup.34©2011 Avidyne Corporation. All rights reserved. 55 Old Bedford Road Lincoln, MA 01773 www.avidyne.com