Which type of radar requires no equipment on the aircraft?

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Primary radar is the correct answer because it operates on the principle of pulse reflection. In primary radar systems, ground-based radar sends out radio waves that bounce off any object within its range, such as an aircraft. The radar then detects the returned signal to determine the object's location and distance. This means that the radar relies solely on its own transmission and the reflection off the target, requiring no onboard equipment on the aircraft itself.

In contrast, secondary radar systems rely on transponders installed in aircraft that transmit information back to the radar. Weather radar is specifically designed to detect weather patterns and does not primarily track aircraft. Satellite radar relies on satellites and also requires equipment for communication and tracking purposes. Thus, the characteristic of primary radar requiring only ground-based equipment makes it unique among the listed types.