Equipment > Satnav (GPS GLONASS COMPASS Galileo)
Satnav Jamming Notices
Lyle Brotherton:
One of the largest satnav jamming exercises to take place in the UK is planned and will have two centres on the north and west coasts of Scotland.
There will be multiple jammers will be located from:
1. Within a radius of 35 miles of Faraid Head 58-36N 004-46W.
2. The Little Minch and North Minch northwards from Waternish Point 57-36N 006-38W to Stoer Head 58-14N 005-24W, including Sound of Raasay and Inner Sound
It is a land based multiple jammer exercise centred around 1575.42MHz, which is the L1 carrier that civilian satnavs employ, and will affect hundreds of square miles.
Intermittent for 1hr slots between 0800BST and 2130BST between 16-26 April 2012.
This operation is so large that a Dedicated Emergency Telephone Number - 01436 67432 Extension: 4372 has been assigned for use in an emergency. Any shipping vessel or the Emergency Services, Tiers 1 thru 3 (inc Mountain Rescue) may request a cesation of jamming by telephoning this number or using VHF radiosets -call sign: Loch Ewe / Cape Wrath GPS Jamming).
Lyle Brotherton:
Two planned satnav jamming exercises
1. Salisbury Plain in Wiltshire.
The jammers will be located within 5km of SU 01690 45312 and be active between 2nd July to 11th July inclusive, between 0700 BST and 2000 GMT weekdays only.
2. RAF SpadeDam, Cumbria.
The jammers will be located within 5km of NY 64550 72016 and be active between 10th – 14th September inclusive.
The proposed wattage for both of these exercises is quite high so it may well extend beyond the areas where the broadcast originates.
Like all sessions of jamming reported here the signal will be the L1 carrier that civilian satnavs employ.
Lyle Brotherton:
Two planned satnav (GPS) jamming exercises Sennybridge Training Area, north of the Brecon Beacons, Wales.
Dates
24-28 September, 2012 inclusive between 0900 -1700 BST
1-5 October 2012 inclusive between 0900 -1700 BST
Area
Multiple land based jammers centred around SN 87747 36765 (N55.017931° W 3.637291°)
Frequencies (all at 24 MHz bandwidth)
1575.42MHz - used in all car and handheld civilian satnavs
1176.45 MHz – military frequency only (P-code)
1227.60MHz – the new frequency designed for SoL (Safety of Life) navigation used by commercial aircraft
Primarily low power transmissions will be employed (10 Watts EIRP) affecting only hill walkers and a few vehicles on the Mynydd Bwlch-y-Groes as there are several rights of way on hill and forest tracks in this area.
However, high power (100 Watts EIRP) transmission are also planned, the exact days these high power transmission will be announced prior to the actual days; these will cause severe disruption over a large area.
The high power jamming will not affect satnav users up to a height of 25 metres AMSL (Above Mean Sea Level) around the UK coastline.
Lyle Brotherton:
This is primarily a maritime jamming exercise although there will be some coastal margins affected.
Dates: October 1-11, 2012 inclusive.
Times: Intermittent for 1hr slots between 0700BST and 2130BST.
Location of MULTIPLE jammers:
1. The Little Minch and North Minch northwards from Waternish Point 57-36N 006-38W to Stoer Head 58-14N 005-24W, including Sound of Raasay and Inner Sound.
2. Within 35 miles of Faraid Head 58-36N 004-46W.
Frequency: A 24 MHz band centred around 1176.45 MHz (GPS L5), 1227.60MHz (GPS L2) and 1575.42MHz (GPS L1).
In an emergency any vessel may request an abatement of jamming via VHF through Emergency cease jam via the Coastguard, the Jamming Station - Call Sign: Loch Ewe / Cape Wrath GPS Jamming - or by telephone to Joint Warrior Duty Controller 01436 674321 Ext 4372.
Lyle Brotherton:
Dates: Between 21 and 25 January 2013
Times: Times: 0900 -1600 GMT.
Location of MULTIPLE jammers: Land based within 5km of N52° 29.0’ E000° 45.0’.
Stanford Training Area, Norfolk
Frequency: A 24 MHz band centred around 1575.42MHz (GPS L1)
Jammers: Directional jammers radiating CW, BPSK and noise modulation
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