omega tau - English only

How do scientists uncover phenomena and explain their connections? How do engineers design machines, methods and infrastructure? At omega tau, experts give detailed answers. Over the last ten years, we have produced over 350 episodes in which we dug deeper, until we ran out of questions. Join us on our journey through the world of science and engineering: the closer you look and listen, the more interesting things get.

https://omegataupodcast.net

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episode 266: Secondary Surveillance Radar


Guest: Mike Sharples    Host: Markus Voelter    Shownoter: Stefan Rillaert

Secondary surveillance radar (SSR) is the radar technology used in aviation to query transponders; it forms the backbone of today’s air traffic control infrastructure. Our guest in this episode is Mike Sharples who has been part of the development of the technology and is intimately familiar with the details. We discuss the importance of SSR today, the details of the protocol, the difference between and evolution from Mode A/C to S as well as the relationship to ADS-B.

Introduction 00:02:31

Michael Sharples | COMSOFT Solutions | Royal Signals and Radar Establishment | Mode S

Overview primary and secondary radar 00:04:56

Radar | Primary radar | Chain Home | Bistatic radar | Multistatic radar | Secondary surveillance radar | Transponder | Identification friend or foe | Aviation transponder interrogation modes | Plot extraction | Signal processing | Garbling/Degarbling | Matched filter | Monopulse radar | Sliding window | Pulse repetition frequency | Side lobe | Side Lobe Suppression

Mode S 00:48:01

(American) history of Mode S | DABS/ADSEL | Mode S 24-bit address | Controller–pilot data link communications (CPDLC) | Aircraft Communications Addressing and Reporting System (ACARS) | Mode S error correction | Mode S Uplink | Mode S Downlink | Mode S Interrogation | FLARM (Episode 143 – Collision Avoidance with FLARM)  | Mode S Enhanced Surveillance (EHS)

ADS-B 01:41:21

(Automatic dependent surveillance – broadcast (ADS–B))  | Omnidirectional antenna | Multilateration (MLAT) | Clock synchronization | ADS-B spoofing | ADS-B on Raspberry Pi | Flightradar24 (Automatic dependent surveillance — contract (ADS-C))  | ADS-B receivers on Iridium


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 October 13, 2017  2h14m