How does the dual memory function reduce sea clutter?

The dual memory function effectively reduces sea clutter by utilizing a method that relies on digitized successive sweeps of radar signals. When the radar system takes multiple sweeps, it captures a full representation of the environment—both desired targets and unwanted backgrounds, such as waves and other forms of clutter. By comparing the data from these sweeps, the system can filter and eliminate signals that are inconsistent across the two passes.

Only those signals that are present in both sweeps, which typically correspond to actual moving targets like vessels or other objects of interest, are retained and displayed. This technique helps ensure that transient clutter, which may only appear in one sweep (like sea waves or birds), is suppressed, leading to a clearer and more accurate representation of relevant targets on the radar display.

This method is efficient for isolating the persistent targets amid the clutter, thereby enhancing the radar's ability to provide useful information in challenging maritime conditions.