Lecture_11 - Electronic Combat Systems II NS 212 LT Adam...

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Electronic Combat Systems II NS 212 LT Adam Sheppard
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REVIEW: 3 main categories of noise jamming Spot: if frequency/ bandwidth of the victim radar is known Sweep: if frequency/ bandwidth of the victim radar is unknown Is the jamming effective at the instant shown to the right? Noise jam
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REVIEW: 3 main categories of noise jamming Barrage: if frequency/ bandwidth of the victim radar is unknown What’s happening here? Burnthrough: screen platform is producing a return stronger than the jamming signal ineffective
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Noise jamming effectiveness depends on: Distance to the victim radar Does the jammer have any advantage over the victim radar in this area? One-way vs. two-way propagation!
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Noise jamming effectiveness depends on: Available power output X bandwidth Similar to power contained in a radar pulse, a noise jammer has some “maximum” power it can produce. It could: Focus power on a narrow bandwidth (spot or sweep) Spread power out over a broad bandwidth (barrage) Which type is used (spot/barrage) depends on… whether the victim frequency is known beforehand whether the jamming is to be used against only ONE radar or many radars
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Between spot and barrage type denial jamming, which would be more effective against a radar displaying a high degree of "frequency agility" and why? Describe a major disadvantage of the type of jamming you choose. Barrage Less power Considering the previous question, describe why an adversary would be wise (if they were able) to increase the power output of their radar in the presence of the jamming you chose. Cause your signal to burnthrough the jamming you’re producing on their radar display!
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Noise jamming: Advantages: Simple Disadvantages: Because it’s simple, many methods have been developed to defeat it Requires jammer to maintain proper geometry to victim radar Jammer still able to be tracked in bearing Jammer vulnerable to home-on-jam weapons
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radar effective in-effective Effective but aircraft may burn-through Effective but jammer vulnerable to attack
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ALQ-99
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ALQ-99: Capable of: Intercepting, automatically processing and jamming received radio frequency signals Detect, identify and direction find those signals
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  • Spring '14
  • Angular deception jamming, Electronic Combat Systems II, LT Adam Sheppard

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