gnss jamming - aopa norway · pdf filegps jammers jamming functions gpsl4:12so-1280mhz 4 item...
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GNSS jamming
Torkel Hasle AOPA årsmøte 2016
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GNSS• Felles betegnelse for alle satellitt-baserte
navigasjonssystemer
• GPS, Galileo, Glonass, Compass-Beidou, IRNSS, WAAS, EGNOS…
• Meget svake signaler, lett å jamme
• billykt på 20 000 km avstand
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GNSS brukes ikke bare til posisjon - også som tidsreferanse
• NTP-protokoll Internett
• digitalradio (DAB)
• mobilnett
• kraftforsyning
• …
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Feil med tidssynk januar 2016
• 14 µS (mikrosek.) over mange timer
• 1 nanosek. er 1 fot
• 14 µS er 4 km feil posisjon
• påvirket ikke posisjonen, men kunne gjort det
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Jammere fås kjøpt på nettet for 100€
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Hvorfor?
• Yrkessjåfører vil ikke bli tracket
• Dyre biler/båter som stjeles, har GPS-tracker installert
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Effektivt: en jammer på toppen av The Shard
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Effektivt: en jammer på toppen av The Shard
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Alternativer/redundans
• Beholde bakkebaserte installasjoner: VOR DME NDB ILS
• E-Loran
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E-Loran• Langbølgete kraftige
radiosignaler
• 4 stasjoner dekker norske områder (også til havs)
• Stengt desember 2015
• Rivingen stoppet?
• Kommersielt drevet
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Linker
• Nordisk navigasjonsforum http://tinyurl.com/jxk8ow6
• Professor David Last http://www.professordavidlast.co.uk/