how does radar jamming work?

[Squawk7777]

I saw a brief part about electronic counter measures on the tele last night. How does radar jamming work? What kind of signals are transmitted and is jamming only applicable to airborne equipment?

The civil

7 7 7 7

[Hertzsprung Russell]

There are various types of radar jamming, range-gate-pull-off (RGPO) and angle-gate-pull-off (AGPO) to name just two. The intention of these jammers is to 'distort' the true position of the target in terms of range and angle from the source radar. However, you can't beat blatting lots of power (noise) on the radio frequency (RF) used by the radar, especially if it only transmits on a single RF. Hope this helpS, H-R.

[newshound]

Go to the Journal of Electronic Defense (http://www.jedonline.com/default.asp?func=ew101), create a login name, and find the Resource Guide > EW 101 Archives. You'll find a squillion EW articles, with lots of maths for the hard of sleeping.

[MikeTells]

Bob Marley was something of an expert in this field. I believe he used a device called a spliff, but I have no further details.

[GuinnessPWS]

BM definately spent a lot of time jammin'.

[ZH875]

Hertzsprung Russell says

"you can't beat blatting lots of power (noise) on the radio frequency (RF) used by the radar, especially if it only transmits on a single RF"

I would like to see his expression when a Home-On-Jam missile is sent straight up his jamming signal.

The better way to jam is spoofing, affect range gate or angle gate, then although NME knows you are there, he/she may track you, but as you are not really in the radar track, any missile is likely to be mis-targetted.

Safe Flying.

[Smoketoomuch]

As mentioned, JED is a good source and a great free monthly read too. There's an interesting article on chaff in this months issue.

The seemingly ever expanding BBC also can advise you on some of your electronic warfare queries,
http://www.bbc.co.uk/dna/h2g2/alabaster/A595082

[Hertzsprung Russell]

ZH875 Squawk7777's question was about jamming not anti-jamming techniques such as HOJ. However, if your HOJ missile was up my chuff then my expression would be something like :\ shortly followed by :{ and then :D after it had missed !

7777 By the way, radar jamming is certainly not restricted to airborne platforms.

[Scud-U-Like]

http://www.tv.cream.org/how1.jpg

"...............and that's............how ya jam a radar"

[ZH875]

Hertzsprung Russell, many thanks for your response. After a lousy day at work, I am now a much happier bunny.

Scud-U-Like That was even funnier.

Thanks guys, I shall sleep much more contented tonight.

.... if only ... Missile ....no Anti missile defences ...Blair Force 1 ...

...ZZZZZZzzzzzzzzzz

May your landings = your take offs.

[Charlie Luncher]

Hertz

Anorak cx:8

spending too much time with neil B:zzz:

Charlie sends

[Hertzsprung Russell]

Charlie L

Just for you, here's a reminder of the Burn Through Range (monostatic) equation commonly used in jammer applications. As I'm sure you're aware, it's in dB form using 10log 4 pi = 10.99 dB

20log R (BT) = 10log P(t) + 10log sigma + 10log F(t) - 10log P(j) - 10log G(ja) + 10log (J min eff/S) - 10.99 dB

I bet Neil B doesn't know that one !

Anorak, moi ? :p