Which radar system utilizes the target's doppler shift to create an image?

The correct answer is ISAR, which stands for Inverse Synthetic Aperture Radar. ISAR systems leverage the Doppler shift caused by the relative motion between the radar and the target to generate high-resolution images. This approach is particularly effective for imaging moving targets, such as ships or aircraft.

ISAR operates by capturing the radar echoes from a target as it moves, effectively allowing the radar to create a synthetic aperture. By analyzing the changes in frequency (Doppler shift) due to the movement of the target, ISAR can produce detailed two-dimensional images that represent the shape and features of the object. This imaging capability is crucial in various military applications, including surveillance, reconnaissance, and target identification.

The other options pertain to different radar functionalities. MTI, or Moving Target Indicator, focuses on detecting and tracking moving targets against a cluttered background but does not create detailed images like ISAR does. SAR, or Synthetic Aperture Radar, is a related technology that creates high-resolution images of stationary scenes through the motion of the radar platform itself but relies on its own movement rather than the Doppler effects from the target. PSR, or Primary Surveillance Radar, primarily detects the range and bearing of targets but does not create images or utilize Doppler