Which radar mode is not affected by the shadowing effect?

Radar operates using electromagnetic waves to detect and measure objects. The shadowing effect occurs when an object blocks the radar signal, which can limit the range and accuracy of detection. In the context of radar modes, the stationary mode is particularly notable because it involves the radar system itself being stationary while gathering data.

Stationary mode typically involves the radar unit being fixed in a position, which allows it to continuously monitor a specific area for any movements or objects. Since the radar is not moving, the direct line of sight to the targets remains consistent, minimizing the likelihood of shadowing caused by other objects in the environment. This consistency ensures that the radar can efficiently detect objects that may be present in its operating range without the interference of shadowing.

Conversely, other modes such as moving mode, scanning mode, and vertical mode may either involve the radar unit moving or have varying angles of detection, which can lead to instances where certain objects obstruct the radar signal and create shadow effects. Therefore, stationary mode stands out as the method least impacted by this phenomenon, making it the correct answer.