What does a positive sweep signal represent?

A positive sweep signal represents a rectangular waveform that is vital for synchronizing and timing within radar systems. It is directly related to the sweep time of the reference sweep signal, which dictates the intervals at which the radar system sends out pulses to explore for targets.

This rectangular waveform helps in ensuring that the radar maintains accurate timing, allowing it to effectively map out the environment by continuously sending and receiving signals. The clarity and precision offered by the rectangular shape of the waveform are essential for the radar system to function correctly, especially as it transitions through its operational cycles.

In contrast, the other options do not align with the fundamental characteristics of a positive sweep signal. An inverted waveform is not typically used for variable range detection in this context, and a continuous signal for tracking moving targets or a noise elimination waveform describe different aspects of radar operation that do not explicitly refer to the positivity of the sweep signal itself.