[ntp:questions] ANN: UK GPS Jamming update

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Wed Mar 28 20:03:36 UTC 2012


Ron Frazier (NTP) wrote:
> 1) Is the UK govt doing this?

Perhaps, likely a NATO exercise.


> 2) Is the USA doing anything similar?

Notices / Advisories are issued all the time.
 {Something like 43 exercises are scheduled in / near the US in the next 3 months.}

<http://www.navcen.uscg.gov/pdf/gps/gpsnotices/GPS_Interference.pdf>

 e.g.

NANU e.g.:
... ON APPROXIMATELY 14 MAR 2012 ... SVN32/PRN24 WILL BE UNUSABLE UNTIL FURTHER NOTICE.
... GPS SATELLITE SVN27 (PRN27) UNUSABLE ON JDAY 086 (26 MAR 2012) BEGINNING 1418 ZULU UNTIL JDAY 086 (26 MAR 2012) ENDING 1556 ZULU.


NOTAM e.g.:
!GPS 09/062 (KNMH A0067/11) GPS NAV PRN 24 OTS

!GPS 03/063 ZAB NAV GPS IS UNRELIABLE AND MAY BE UNAVAILABLE WITHIN A RADIUS OF 348 NM
 AND CENTERED AT 371324N/1163145W OR THE LOCATION ALSO KNOWN AS THE /BTY/ VOR RADIAL 022.3
 AT 27.4NM AT FL400 AND ABOVE;
 DECREASING IN AREA WITH A DECREASE IN ALTITUDE TO A RADIUS OF 296 NM AT FL250;
 A RADIUS OF 224 NM AT 10,000FT MSL;
 A RADIUS OF 200 NM AT 4,000FT AGL AND A RADIUS OF 167 NM AT 50FT AGL. 0600-1500 DLY WEF 1203290600-1203301500


ATC Notice / Flight Advisory e.g.:
Centered at 402602N/1132936W or the BVL VOR 145.44 degree radial at 21.3NM.
 28 APR – 29 APR 1700Z – 2000Z 2200Z – 0000Z, 30 APR - 06 MAY 1700Z – 2000Z,
 09 MAY – 13 MAY 1700Z – 2000Z; the GPS signal may be unreliable or unavailable
 within a 395NMR centered at 402602N/1132936W or the BVL VOR 145.44 degree radial
 at 21.3NM at FL400 and above, decreasing in area with decrease in altitude to 355NMR at FL250,
 260NMR at 10,000 FT MSL, 265NMR at 4,000 FT AGL and 225NMR at 50 FT AGL.


> 3) What's the purpose?

Usually Military Operations Jamming / Spoofing Resistance Testing of Navigation and Weapons Systems.
 e.g. Here is one at a Naval Air Weapons Center
<www.faasafety.gov/files/notices/2011/Sep/CHLK_11-11_Flight_Advisory.pdf>


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