What method is categorized as active jamming?

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Active jamming is characterized by the direct interference of radar or electronic signals, which strategically disrupts the communication or detection capabilities of radar systems. This method involves the use of electronic means to generate signals that can confuse or overwhelm the radar, effectively masking or altering the transmission of information.

In contrast, dropping chaff refers to deploying small bits of aluminum or plastic to create false radar echoes, which is a form of passive jamming. Interfering with ground signals and using reflective materials also fall under passive methods. They do not actively generate their own disruptive signals but instead manipulate existing signals or environments to interfere with radar detection. Therefore, the method that directly engages with and disrupts radar through electronic means is correctly identified as active jamming.