GPS jamming exercises

Mae'r cynnwys hwn ar gael yn Saesneg yn unig.

The Ministry of Defence conduct occasional tests on military systems which may result in some loss of service to civilian users of the Global Positioning System (GPS) including in-car navigation devices and networks which rely on GPS signals. Ofcom seeks to provide citizens and consumers with information about possible interruptions to these services. It must be emphasised that this notification process only warns of future jamming exercises that are brought to the notice of Ofcom and may not cover all jamming exercises. It cannot be assumed that any loss of service is due to jamming exercises.

If you have any queries regarding these notices forward them to InfoGPS.Notices@ofcom.org.uk

Notification Of GPS jamming exercise: Hebrides Ranges, 16 September – 25 October 2019

Dates: The exercise will run over the period 16 September – 25 October 2019.

Times: 10:00 – 16:00 excluding weekends, with a maximum of four two-hour periods in total.

Location: 57°30’N/ 009°20’W and 57°30’N/ 011°00’W.

The affected area is from sea level to beyond 40000ft amsl.

The effect at Sea Level can be considered as affecting a circle of maximum radius 90Nm centred on 57 30N 010 45W.

The maximum effect at 3500ft up to and beyond 40000ft amsl shall be 325nm from 57°30’N/ 009°20’W and 57°30’N/ 011°00’W centred on a bearing of 270 deg with a cone of effect of 45 deg.

Notification of GPS jamming exercise: Sennybridge, 5 – 23 August 2019

Dates: The exercise will run over the period 5 – 23 August 2019.

Times: 09:00 – 18:00.

Frequencies: 1559 – 1612 MHz, 1215 – 1256 MHz, 1160 – 1214 MHz.

Location: Within 5km of Dixies Corner, Sennybridge. SN 874 364.

Worst case areas of effect against a receiver:

2m AMSL - Areas with clear line of sight to the transmitter site.

25m AMSL - Areas with clear line of sight to the transmitter site.

70m AMSL - Areas with clear line of sight to the transmitter site.

5,000ft AMSL – Up to 100 km (54 nm) in all directions.

10,000ft AMSL – Up to 105 km (57 nm) in all directions.

20,000ft AMSL – Up to 110 km (60 nm) in all directions.

30,000ft AMSL – Up to 112 km (61 nm) in all directions.

40,000ft AMSL – Up to 113 km (62 nm) in all directions.

Dates: The exercise will run over the period 5 – 23 August 2019.

Times: 10:00 – 12:00, 14:00 – 16:00.

Frequencies: 1559 – 1612 MHz, 1215 – 1256 MHz, 1160 – 1214 MHz.

Location: Within 5km of Dixies Corner, Sennybridge. SN 874 364.

Worst case areas of effect against a receiver:

2m AMSL – Areas with clear line of sight to the transmitter site.

25m AMSL – Areas with clear line of sight to the transmitter site.

70m AMSL – Areas with clear line of sight to the transmitter site.

5,000ft AMSL – Up to 180 km (98 nm) from the transmitter site within a 225°- 270° arc, up to 120 km (65 nm) from the transmitter site within a 177° - 185° arc and up to 100 km (54 nm) in all other directions.

10,000ft AMSL – Up to 195 km (106 nm) from the transmitter site within a 225° - 275° arc, up to 190 km (103 nm) from the transmitter site within a 150°- 190° arc and up to 105 km (57 nm) in all other directions.

20,000ft AMSL – Up to 210 km (114 nm) from the transmitter site within a 160° - 265° arc and up to 110 km (60 nm) in all other directions.

30,000ft AMSL – Up to 220 km (119 nm) from the transmitter site within a 160° - 265° arc and up to 112 km (61 nm) in all other directions.

40,000ft AMSL – Up to 225 km (122 nm) from the transmitter site within a 160° - 265° arc and up to 113 km (62 nm) in all other directions.

Notification Of GPS jamming exercise: Hebrides Ranges, 3 June – 5 July 2019

Dates: The trial will be conducted during the period 3 June – 5 July 2019, excluding weekends (comprising four two-hour jamming periods).

Times: 10:00 – 16:00 (two-hour jamming period).

Frequencies: 1227.6 MHz and 1575.42 MHz.

Locations: Directional jamming from 57°30’N/ 009°20’W and 57°30’N/ 011°00’W centred on 270deg with cone of effect +/- 60deg. Large affected area from sea level up to and beyond 40kft with max range of 325nm.