Marine radar: target detection and the Doppler effect

RADAR, from Radio Detection And Ranging (Radio Detection and Ranging), is a radio-frequency transceiver that can detect and measure the distance between its origin and a detected target, potentially over long distances.

Radar development involved different researchers and applications throughout the twentieth century. Military use contributed to technologies that also reached civilian navigation. This review does not attribute the invention or its outcomes to a single person or date.

Radar transmits electromagnetic waves and receives echoes reflected by targets. In pulsed radar, the time between transmission and reception allows range to be estimated; bearing is related to antenna orientation. Systems and transmission modes vary by equipment. On compatible models, Doppler features use the frequency shift of the echo to indicate radial motion toward or away from the radar. They do not replace lookout, situation assessment or the radar's detection limits.

The examples and videos below belong to the original edition's selection. They are not a current ranking or an indication of availability. Confirm the model, software, required sensors and features in the manufacturer's manual before specifying a system.

Simrad Halo

Garmin Fantom

Furuno DRS-X

Raymarine Quantum 2

REFERENCES

GARMIN

SIMRAD

RAYMARINE

FURUNO

RADAR

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Primary sources consulted for this review (October 8, 2026): Raymarine Quantum 2 — Doppler; Raymarine — Doppler settings