Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

Satellite Interference!

…a History Lesson in Technology

satellite Interference Reduction Group

are dealing with…

formerly

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

SCPC and fixing Interference in 1979…

!  Site: Madley Earth Station, Hereford, UK !  Reference Station for all Indian Ocean Region SCPC systems – (32m C-Band) !  Typical System: 400 SCPC two-way Channels in 36MHz Transponder !  Madley = 116 two-way Channels from a total capacity of 200 approx.

Problems… X  System expansion required but Transponder saturated! X  Rogue/Pirate Carriers - a regular occurrence! System Management… "  Mon/Wed/Fri System Measurements taken for every Customer… "  Frequency Offset from Madley Pilot "  Carrier Level & C/N Conclusion… Power Level coordination and rigorous monitoring – solved Expansion Frequency Offset acted as a “statistical” Carrier ID – solved Rogue/Pirates

Marconi Instruments TF2371 200MHz Spectrum Analyzer

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

…what does this mean today?

!  Understanding the way transponders work in multi carrier environment !  Know the operating point, when you are pushing too far !  Modern measurement systems offer non intrusive transponder compression

detection (sometimes with operating point information)

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

!  “the Piper Alfa Disaster” 6th July 1988 !  Tropospheric Scatter Quad Diversity Antenna Systems – High Reliability!!!

So what can we learn from that technology today?

Apply Quad Diversity to Ka-Band Receive systems?

Quad Diversity Systems, IP and Tropospheric Scatter Systems…

How it worked… 2GHz 18m Billboard Antennas!

Tropo inaugurated in 1976…

For those interested in the event go to… http://www.theguardian.com/business/2013/jul/04/piper-alpha-disaster-167-oil-rig

A view of the North Sea from the top!

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

…what does this mean today?

•  Diversity used in Troposcatter systems to assure communications

•  Todays digital technology we can move a transponder traffic over any IP network (with bandwidth)

•  Advanced diversity algorithms to assure communications •  Overcome weather issues

Site  Diversity/  Failover  

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

A view from inside the Chip! Fixing problems in an International Cross-Bar Exchange – 1972…

Wood Street, a brand new ITSC (International Telephone Services Centre), opened in 1972 and was fitted with TXK2 Cross-Bar equipment, the ATE 5005T manufactured by Plessey. It was described as a 'modern 4-wire gateway international exchange.’

International Accounting & Traffic Analysis Equipment (IATAE)

For those interested in Wood Street, etc. Go to… http://www.lightstraw.co.uk/ate/main/woodstreet/

International Maintenance Centre (IMC) Console

Cross-Bar equipment…

…Plessey XL9

Ferrite Core-Store… 16K/16bit Word!!!

Paper Tape Readers & Punches…

Maintenance & Programming Console…

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

A view from inside the Chip! Time Assignment Speech Interpolation (TASI 1959 Bell Labs early 1950s)…

Faraday ISC used Strowger technology switching. Opened in 1933. Dual Tone Multi-Frequency (DTMF) Dialling… TASI…

For those interested in Faraday, Transatlantic Cables, etc. Go to… http://www.lightstraw.co.uk/ate/main/faraday/faradayisc1.html http://www.lightstraw.co.uk/ate/main/faraday/faradayicc1.html http://en.wikipedia.org/wiki/Transatlantic_telephone_cable http://yovisto.blogspot.co.uk/2012/09/transatlantic-telecommunication-via.html

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

…what does this mean today?

•  Being in the right place at the right time •  Time varying interference •  Modern digital signal capture can time stamp (accurately) signals as they

appear •  Query Hub systems for who is up at the time •  Statistical analysis, correlation over multiple events yields the candidate

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

…so how do we “Fault Find”?

!  How we think through problems !  Etc…

…can we rethink today’s problems using old techniques?

!  The new CID uses “Spread Spectrum” techniques – so nothing new there☺ !  Etc…

Presented by Martin Coleman - Executive Director sIRG & Bob Potter CTO, SAT Corp – a Kratos Company www.satirg.org

THANK YOU!

satellite Interference Reduction Group

formerly