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#3752311 - 03/17/13 02:50 AM Re: Electronic Warfare-9 [Re: Hpasp]
Mdore Offline
Member

Registered: 08/20/12
Posts: 216
Originally Posted By: Hpasp
Originally Posted By: Mdore
How do you defeat a target that is using modulated noise jamming?


Considering the SA-75M Dvina (SA-2B/F) and the S-75M Volhov (SA-2E), the answer is simple against one plane using Modulated Noise Jamming ...
... you simply need to aim at the middle band.


But, unless the modulation of the jamming is exactly synced with the horizontal scanning frequency, the middle band could be slightly to the side of where the actual target is?

Wouldn't that work as crude angle-jamming? Making the missile likely to miss?

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#3752320 - 03/17/13 03:38 AM Re: Electronic Warfare-9 [Re: Mdore]
piston79 Offline
Member

Registered: 09/02/11
Posts: 1280
What the manual says (Google translation):

Quote:
Work under the influence of noise on SNR modulated continuous interference, leading away the corners
If the primary and secondary continuous band of noise narrowed or expanded, creating the illusion of displacement director of the angular coordinate, this is evidence of the use of noise-modulated continuous enemy interference.
The procedure for finding the jammer, frequency hopping channels sighting targets and attack targets in this case is the same

as when shooting against continuous unmodulated noise jamming. The main features of combat operation in conditions of the considered noise associated with the choice of method of tracking and techniques to support the direction on the angular coordinates.
Tracking the jammer is only in RS with with system of averaging the target signal off, as modulation noise voltage with a frequency which is a multiple scanning frequency SNR leads to oscillations (lead) energy cal center interference signal from the angular coordinates ca simplicity beats, which dramatically increases the error automatically with spending. Inclusion scheme smoothing (averaging noise) limits the observed signal from the bottom and can not determine the true center of the band noise.
At the beginning of the tracking must support operators to define target motion on the screen at maximum brightness and width * interference, in order to be able to distinguish false - the offset signal interference caused by the asymmetric change the brightness and the bandwidth of the displacement caused by the moving . The operator remembers the position of the middle band interference to its maximum size and brightness in the future continues to monitor the selected point of support.
Especially complex work of operators with a large beat frequency modulation frequency and frequency scanning. In these cases, the screen shows frequent narrowing lanes, creating the illusion of flashing, resulting in a rapid visual attrition and weakening of the operator's attention. These influences can be lowered by reducing the brightness and increased by RRU by changing bandwidth interference. If noise modulated jamming was created by the type of inversion (constant-SVR, th), the support is in the middle of the band, regardless of 1eravnomernoy brightness.


Edited by piston79 (03/17/13 03:56 AM)
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#3752343 - 03/17/13 05:49 AM Electronic Warfare-10 [Re: Wolfhound]
Hpasp Offline

Member

Registered: 12/31/09
Posts: 2102
Loc: Hungary, Europe
The next breakthrough in the field of Electronic Warfare was the Westinghouse AN/ALQ-131 pod, fielded by the USAF.


This was the first jamming pod, using re-programmable software with digital processor called VHSIC (Very High Speed Integrated Circuit) that time, running on 1MHz.
The software of the pod, was able to track and predict the PRF of the threat, a capability was called RANRAP (Random Range Program).
The False Target Jamming technique created 7~8 realistic targets, that had different sizes and some of those were placed closer/further than the jamming plane.



Similar capability was introduced by the NAVY with the Sanders AN/ALQ-126 system built into the F-4, F-14, F-18, A-4, A-6, and A-7 planes.




Edited by Hpasp (03/17/13 05:50 AM)
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Hpasp
Free SAM Simulator, "Realistic to the Switch"

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While Fighter Pilots made movies, SAM Officers made History.
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#3752358 - 03/17/13 06:33 AM Re: Electronic Warfare-10 [Re: Wolfhound]
farokh Offline
farokh
Member

Registered: 04/22/12
Posts: 834
Loc: IRAN
guys... pleas e guide me about DM jammer...
do u have any picture of it?
and someone tell me this pod could be arm on what kind of aircraft
? wave


Edited by farokh (03/17/13 06:34 AM)
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Ehem Ehem

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#3752362 - 03/17/13 06:53 AM Re: Electronic Warfare-10 [Re: farokh]
piston79 Offline
Member

Registered: 09/02/11
Posts: 1280
Originally Posted By: farokh
[b]guys... pleas e guide me about DM jammer...
do u have any picture of it?


List of jammers mounted on B-52/EB-66 (during Vietnam war):


Google them and pick-up some pictures...
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#3752365 - 03/17/13 07:03 AM Re: Electronic Warfare-10 [Re: farokh]
Hpasp Offline

Member

Registered: 12/31/09
Posts: 2102
Loc: Hungary, Europe
Originally Posted By: farokh
guys... pleas e guide me about DM jammer...
do u have any picture of it?
and someone tell me this pod could be arm on what kind of aircraft
? wave


DM jammer, what is that?

These techniques are on the table, and we already discussed the red colored ones:

Denial Jamming:
- Barrage Noise Jamming
- Spot Noise Jamming
- Swept Spot Noise Jamming
- Cover Pulse Noise Jamming
- Modulated Noise Jamming

Deceptive Jamming:
- False Target Jamming
- Range Deception Jamming (Range Gate Pull Off)
- Angle Deception Jamming (Inverse Amplitude Modulation, Inverse Gain Jamming, Swept Square Wave)
- Velocity Deception Jamming (Velocity Gate Pull Off, Doppler Noise, Narrow-band Doppler Noise, Doppler False Targets)
- Mono-pulse Deception Jamming (Cross Polarization Jamming, Cross Eye Jamming)


Edited by Hpasp (03/17/13 07:07 AM)
_________________________
Hpasp
Free SAM Simulator, "Realistic to the Switch"

http://sites.google.com/site/samsimulator1972/home

While Fighter Pilots made movies, SAM Officers made History.
(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
thumbsup

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#3752378 - 03/17/13 07:42 AM Re: Electronic Warfare-10 [Re: Hpasp]
farokh Offline
farokh
Member

Registered: 04/22/12
Posts: 834
Loc: IRAN
Originally Posted By: Hpasp
Originally Posted By: farokh
guys... pleas e guide me about DM jammer...
do u have any picture of it?
and someone tell me this pod could be arm on what kind of aircraft
? wave


DM jammer, what is that?

These techniques are on the table, and we already discussed the red colored ones:

Denial Jamming:
- Barrage Noise Jamming
- Spot Noise Jamming
- Swept Spot Noise Jamming
- Cover Pulse Noise Jamming
- Modulated Noise Jamming

Deceptive Jamming:
- False Target Jamming
- Range Deception Jamming (Range Gate Pull Off)
- Angle Deception Jamming (Inverse Amplitude Modulation, Inverse Gain Jamming, Swept Square Wave)
- Velocity Deception Jamming (Velocity Gate Pull Off, Doppler Noise, Narrow-band Doppler Noise, Doppler False Targets)
- Mono-pulse Deception Jamming (Cross Polarization Jamming, Cross Eye Jamming)


i see DM jammer on this page ... ASHULUK ... !



also i see this type of jammer in allied forces and vietnam also libya ... what plane can use it ?
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#3752387 - 03/17/13 08:26 AM Re: Electronic Warfare-10 [Re: Hpasp]
piston79 Offline
Member

Registered: 09/02/11
Posts: 1280
Originally Posted By: Hpasp

DM jammer, what is that?


Decimeter/Meter wave jammers...
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Faroukh - The latest anti-SAM jamming pod...

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#3754222 - 03/20/13 02:05 PM Electronic Warfare-11 [Re: Hpasp]
Hpasp Offline

Member

Registered: 12/31/09
Posts: 2102
Loc: Hungary, Europe
On the 6th of October, 1973 the Yom Kippur War was started.
First time in History, a Continuous Wave illuminated, Semi Active guided Surface to Air Missile system was deployed.



This system use the SURN (Straight Flush*) radar to illuminate the target with a CW signal, while the missile would track the received echo from the target...
... most of the jamming techniques available at that time, would simply highlight the jamming target for the missile SARH head, making the actual guidance more precise.

Israel started the war with AN/ALQ-101 pods, and received further 40pcs of AN/ALQ-119 as an US aid.

The AN/ALQ-119 had the extended capability of jamming the Neva (SA-3) complexes, beside the Dvina (SA-2B/F) and the Volhov (SA-2E) systems that was already covered by the AN/ALQ-101.



During the war, these systems were solely used to jam the Dvina/Volhov/Neva (SA-2B/C/E/F, SA-3B) systems.
The jamming of the KUB (SA-6) was not attempted, in a fear of attracting the SA-6 missiles.

* Straight Flush means 5 cards in poker, relating to the 5 frequency, the SURN uses during engagement


Edited by Hpasp (03/20/13 02:29 PM)
_________________________
Hpasp
Free SAM Simulator, "Realistic to the Switch"

http://sites.google.com/site/samsimulator1972/home

While Fighter Pilots made movies, SAM Officers made History.
(U-2 over Sverdlovsk, B-52's over Hanoi, F-4 Phantoms over the Sinai, F-16's and the F-117A Stealth bomber over the Balkans.)
thumbsup

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#3761597 - 04/02/13 05:40 PM Re: Electronic Warfare-11 [Re: Wolfhound]
farokh Offline
farokh
Member

Registered: 04/22/12
Posts: 834
Loc: IRAN
what the RGPO ? this one use by EA system... i dont know this one can make what problem for sam operators ... confused


Edited by farokh (04/03/13 08:32 AM)
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Ehem Ehem

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