Which two types of scopes are the most common in radar systems?

The most common types of scopes used in radar systems are indeed the Plan Position Indicator (PPI) and the Range Height Indicator (RHI).

The PPI is widely utilized because it presents a two-dimensional, bird's-eye view of the area surrounding the radar, overlaying range and azimuth information. This allows operators to visualize and assess the position of targets in real-time easily, making it extremely effective for navigation, tracking, and air traffic control.

On the other hand, the RHI provides a three-dimensional perspective by displaying the height of targets in relation to their distance from the radar. This is particularly useful for analyzing vertical profiles of storms or distinguishing between different types of precipitation and their altitude, contributing significantly to weather monitoring and forecasting.

The combination of these two scopes provides comprehensive situational awareness, making them indispensable tools in radar systems. Other options include less common formats that don’t serve the same broad, essential functions in radar applications.