NarrowbandJamming

Narrowband jamming is a type of electronic warfare technique used to disrupt communications by transmitting a continuous signal at a specific frequency, effectively overpowering legitimate signals within that narrow band. This method targets a single channel or a very limited range of frequencies. The jammer's signal is typically stronger than the desired signal, causing the receiver to interpret the jamming signal as the intended communication, or to be unable to distinguish the weak, legitimate signal from the overwhelming noise. This results in a loss of communication or severely degraded signal quality.

The effectiveness of narrowband jamming depends on the power of the jammer relative to the transmitter and the distance between the jammer and the receiver. It is particularly disruptive to communication systems that rely on fixed frequencies or have limited frequency agility. Countermeasures include frequency hopping, where the transmitter and receiver rapidly switch between frequencies according to a pseudorandom sequence, making it difficult for a narrowband jammer to track and disrupt the communication. Directional antennas and spread spectrum techniques can also mitigate the effects of narrowband jamming.