What is the purpose of the plot processor in the Monopulse Secondary Surveillance Radar (MSSR)?

In the context of Monopulse Secondary Surveillance Radar (MSSR), the plot processor serves a crucial role in processing the replies received from aircraft. The primary function of the plot processor is to group replies that come from the same aircraft, effectively consolidating the information to maintain an accurate and continuous track of each aircraft's position. This grouping is essential for enhancing the reliability and accuracy of the radar system in tracking multiple aircraft in a given airspace.

By organizing replies based on their origin, the plot processor ensures that the data being processed reflects true aircraft positions and movements, preventing data from different aircraft from being mistakenly combined. This is important for air traffic control and management, as it allows for precise surveillance and effective communication regarding aircraft status and location.

While grouping replies from all reachable aircraft and correlating plots with existing tracks are also important functions within radar systems, they are not the primary purpose of the plot processor in MSSR. Additionally, decoding interrogations relates to handling erroneous or incorrect signals rather than the core task of ensuring accurate data from individual aircraft. This focus on consolidating replies from the same aircraft uniquely defines the plot processor's critical function in the MSSR framework.