What does HFRG stand for?

The correct answer identifies HFRG as "High-Frequency Radar Geolocation." This term is relevant in the context of radar technology, particularly in the use of high-frequency signals to locate and track objects or phenomena. High-frequency radar systems are significant in various applications, including atmospheric studies, maritime surveillance, and military operations, as they can provide accurate positional data over long distances.

This designation highlights the primary functionality of HFRG systems, which involves geolocation achieved through high-frequency signal methods. Understanding this terminology is essential for grasping the underlying principles of radar technology and its applications in diverse fields.