Which three fundamental quantities are involved in radar displays?

The fundamental quantities involved in radar displays are range, bearing, and elevation angle.

Range refers to the distance from the radar to the target, which is crucial in determining how far away an object is. Bearing indicates the direction of the target relative to the radar, typically measured in degrees or azimuth. Elevation angle provides the vertical aspect of the target's position, which helps in understanding its altitude or height relative to the radar's position. Together, these three quantities provide a comprehensive understanding of an object’s location in three-dimensional space, essential for accurately interpreting radar data.

The other options include quantities that do not specifically represent the essential aspects of determining a target's position in radar displays. For example, speed, power, and frequency might relate to radar operation and signal characteristics but do not directly define the positioning of targets. Similarly, height, distance, and angle, while relevant to spatial measurements, do not encompass the critical aspects of radar like range, bearing, and elevation. Lastly, frequency, wavelength, and amplitude pertain to the electromagnetic spectrum and the characteristics of the radar signal rather than the spatial positional data crucial for radar operations.