GPS Jamming Exercise at Portreath
 

Just hope the Navy don't get lost....... :cool:

BBC: MoD set to block sat nav systems

People in Cornwall have been warned satellite navigation systems will not work later this week as the Ministry of Defence carry out a jamming exercise.

The aim of the GPS blocking exercise is to find out how interference could affect military personnel. It will take place on Thursday and Friday. The MoD said its Portreath base would be the base. The effect will extend for a radius of 11 km (7 miles) which would cover Camborne and Redruth.

"Although GPS provides highly accurate information, the radio signals from the satellite are extremely weak and are susceptible to both jamming and unintentional radio interference," said the MOD in a statement. "The trials are taking place to better understand these effects on military equipment and therefore will help to protect our forces."

An MOD spokesman said all the emergency services which might use the systems have been informed and if an emergency is under way, the MOD can suspend the trial.

All ambulances are fitted with satellite navigation and in a statement, South Western ambulance service said it was aware of the jamming exercise and that key staff had been informed. Falmouth Coastguard said it had also been told.

If you are in the Military, have you ever heard the term BEADWINDOW. Kermit...................

Yimp,
How can it be a beadwindow occurance when he is quoting from open source and public information given out by MoD to the locals round said airfield as to why their GPS won't work for a few days next week?

http://news.bbc.co.uk/1/hi/england/cornwall/6719639.stm

Foot, Mouth, .......:ugh:

As per the NOTAM;
AUS 07-06-0207/1706/AS2 GPS SIGNAL JAMMING TRIALS. GND JAMMER LOCATED WI 0.5 NM OF 5016N 00516W (PORTREATH, CORNWALL). ACTIVITY MAY AFFECT ACFT WI 6NM RADIUS FLYING BELOW FL300...

They ran a similar trial out of Sennybridge very recently, also well NOTAM'ed. Nothing untoward was noticed at all during the notified period even when flying well within the reported radiating area.

They do it at Sennybridge quite regularly...

...and elsewhere around the world on a regular basis as part of mil exercises or just R & D. What is the big deal?? - Or are you soooo last century that you cannot tactically operate without said nav kit.

How does the MOD stand on a legal point if for instance someone who has paid a lot of money for his Tom Tom gets lost due to the GPS signal being jammed? Could argue the same point for a sailor in his Yacht getting lost.

Then they should learn how to use a road map and nautical chart.

I might be tempted to get the sextant out of it's box.





Or stay close to the pub.

TBH, I don't think my Cornish rellies will be much affected - they're still struggling with the concept of a dual-carriageway A30.

MoD doesn't stand anywhere. Does the TomTom user have a contract and an SLA with the US DoD? No, so no problem.

From the user manual. GPS is operated and controlled under the sole responsibility of the Government of the United States of America, who are responsible for its availability and accuracy. So if they don't stop the UK from jamming it then it's all their fault.

So apart from dropping a 2000 pounder on them, how exactly do you effectively stop someone jamming a GPS signal?

meaconing .

Just the way you said - you have to stop their re-broadcasting system from working, so take out any key component eg power, radio or antennae, or the lot!

Look on the bright side if your GPS is not working then you have a better chance of missing Camborne and Redruth altogether.
That can only be a good thing:D.

Why would you want to Jam GPS ? Surely it would deny your own forces of its capability

Not if they are not operating in that area, but the EF are.:ugh:

Oops, misread the post first time - dyslexic.

As the GPS receiver is very sensitive and uses only very weak signals a jamming signal does not have to be very powerful. Low powered transmitters could be very small and easy to hide, even from a 2000lb bomb.

Indeed several in an area could cause a GPS jammer-homing bomb to land in a 'safe' area.

Call me old fashioned, if you will, but the first defence to jamming is to change frequency. It would not surprise me if the GPS network had a frequency agility mode.

Second defence is to not use fixed frequencies at all, and to frequency hop. GSM phones have the capability to do this at 217Hz. Thus the effect of a jammed/interfered-with channel is averaged over the other time slices, and is negligible. Forward error correction is also applied, in order to be able to reconstruct the lost data.

Better still is to use a CDMA system, where the transmit bandwidth is so wide, and the amplitude so low, that the signal appears as noise to the adjacent channels.

Failing that, MLRS does a good job of anti-jamming.

@Roadster280

I think you will find that GPS has neither the ability to change frequency nor to frequency hop.

The techniques you mention can mitigate jamming issues but not in this instance :=