How many Doppler filters are in the Primary Surveillance Radar (PSR)?

In Primary Surveillance Radar (PSR) systems, the number of Doppler filters is essential for effectively processing received radar signals. The correct number of Doppler filters in a typical PSR setup is five. These filters are designed to separate targets based on their speed, allowing the radar system to distinguish between stationary and moving objects, which is crucial for accurately identifying and tracking aircraft.

The five Doppler filters operate at different frequency shifts corresponding to various velocity ranges of potential targets. By using multiple filters, the radar can improve its sensitivity and accuracy in detecting moving targets, which is vital for air traffic control and safety.

This filtering process helps to reduce the impact of clutter and enhance the quality of the radar's output, ensuring that only relevant target information is presented to the operators. The correct answer reflects the standard configuration used in most PSR implementations to achieve optimal performance in tracking airborne objects.