What is the expected outcome when radar signals are appropriately modulated?

When radar signals are appropriately modulated, better discrimination between targets is achieved. Modulation techniques enhance the radar system's ability to distinguish between different objects in its view, as well as to reduce the effects of clutter and interference. This allows the radar to accurately identify and track multiple targets simultaneously, even in complex environments.

Modulation can improve parameters such as range resolution and angular resolution, which are crucial for differentiating between closely spaced objects. By encoding additional information into the signals, such as frequency shifts or phase differences, the radar can interpret the reflections from various targets more effectively, leading to clearer, more accurate target identification and tracking.

In this context, the other options do not accurately characterize the direct effects of appropriate modulation on radar systems. While decreased transmission time or lower operational costs may be beneficial in certain scenarios, they are not inherent outcomes of signal modulation. No change in performance contradicts the fundamental purpose of modulation, which is to enhance the radar's operational effectiveness.