What is the primary function of the Precision Approach Radar (PAR)?

The primary function of the Precision Approach Radar (PAR) is to land aircraft through talk-down capabilities. This system provides very detailed and precise guidance to pilots during their final approach to landing. It allows air traffic controllers to give real-time instructions to pilots, ensuring they maintain the correct path, angle, and altitude, thus enhancing safety during the landing phase. The PAR is especially vital in low-visibility conditions where visual references are diminished, allowing for accurate control over the landing process.

Regarding the other options, while video feeds for air traffic control and assistance in general air traffic management are important functions of various radar systems and technologies, they are not the specific focus of PAR. The role of tracking aircraft altitude and speed is typically more aligned with other radar systems designed for broader radar surveillance rather than the specific landing assistance offered by PAR.