Electronic – How does RF anti-jam technology work

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I'm pretty certain that RF jammers work by overpowering the target signal with their own higher powered signal at the same frequency. So the question is, how does anti-jammer technology negate the effects of a jammer?

Best Answer

One method is by actively steering the antenna (mechanically or electronically) to place a "null" in the direction of the jammer, reducing its signal strength significantly, while affecting the desired signal minimally, if at all.

Also, assuming the jammer signal strength isn't so strong that it saturates the receiver front end, advanced DSP techniques can be used to estimate and cancel the effects of the jamming signal. The communications protocol itself can be designed to optimize the ability to do this. The problem for the jammer is to mimic the desired signal closely enough to confuse the anti-jam algorithm.

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