Introduction to Ship Radar

Radar helps both in navigation and safety

The modulator generates a timed, shaped signal that the transmitter amplifies and sends out the antenna

Synchronized with the transmitted signal, the modulator generates a trigger pulse that tells the receiver when to start listening for the return echo. “Gating” the process of listening, for example, prevents the receiver from becoming confused by echoes that return from close-by rain

The receiver processes the signal and converts it to a form suitable for display

Most often, the display is a “polar” or “PPI” type that logically places the antenna in the center of a circle, and shows the returns around it

In a marine radar system, the display may combine several sources. For example, a chartplotter might superimpose the radar display onto an electronic chart.

Let's discuss radar navigation.