What method is used to gather useful information from received RADAR signals?

The method used to gather useful information from received RADAR signals is analysis. When RADAR systems receive signals that reflect off various objects in their environment, the next step is to process these signals to extract pertinent information such as the distance, speed, and direction of the objects being detected. This involves quantifying variations in the time delays of the received signals and their frequency shifts, allowing the system to make assessments about the physical characteristics and motion of the detected objects.

Analysis encompasses a variety of techniques and algorithms designed to interpret the collected data and present it in a meaningful way. This could include filtering out noise, resolving multiple targets, and determining the object's trajectory, all of which are crucial for accurate interpretation of the environment being monitored by the RADAR system.

The other methods mentioned—like fabrication, interception, and emission—do not pertain to the process of extracting valuable information from RADAR signals directly. Fabrication refers to the creation of objects or systems, interception typically implies capturing signals for purposes other than analysis, and emission pertains to the transmission of signals rather than their reception and interpretation.