What is a key feature of the new AN/TPX-57 IFF interrogator?

The key feature of the new AN/TPX-57 IFF interrogator is its support for multi-target identification. This capability allows the system to simultaneously interrogate multiple targets, distinguishing between friendly and potentially hostile aircraft in an environment where air traffic may be dense. This is particularly important for effective air defense operations, as it enhances situational awareness and reduces the risk of misidentifying friendly assets. By being able to effectively handle multiple targets, the AN/TPX-57 increases the efficiency and responsiveness of air defense forces, enabling quicker decision-making in critical scenarios.

The other options, while they may ascribe important potential features to an interrogator, do not capture the primary technological advancement represented by the AN/TPX-57. For instance, higher interrogation frequency, compatibility with older radar systems, and satellite connectivity matter in specific contexts or systems, but the standout capability of the AN/TPX-57 is its ability to manage multiple targets, which directly impacts operational effectiveness in the field.