A decidedly … effect radar (Doppler)


Give or treat yourself to a subscription to Boats in Motion print + digital and for only 39 euros a year you get the magazine at home plus read it on your PC, smartphone and tablet. With a sea of advantages.

Doppler technology is not just the stuff of … doctors and scientists! Raymarine’s new pulse compression CHIRP Quantum 2 radar detects targets with great accuracy at both long (up to 24 miles) and very short range (5 meters!).

Using Doppler processing, the system immediately highlights radar contacts and differentiates them with colors to indicate whether they are approaching (red) or receding (green). Target tracking can be done in ARPA mode (in automatic) or MARPA mode (manual).Raymarine’s MARPA target tracking technology is the same as that relied upon by the U.S. Coast Guard. TrueTrails adjustable target history shows the movement history of moving contacts, and interference rejection eliminates disturbances caused by radar transmissions from other vessels. Prices from 2,433 euros including VAT. www.raymarine.it


Energy microwaves bounce off a distant target, just as in a conventional radar.

Moving targets return an echo whose frequency is higher or lower than what was originally transmitted.

For approaching targets, the frequency increases, as the rising front of return echoes is received more frequently as the distance to the target decreases.

For receding targets, the frequency decreases, as the return echoes distribute as the distance increases.

Doppler radars are designed to detect these small changes in wave frequency and to use them to classify moving targets.

Quantum 2 - Target Processing | Raymarine - A Brand of FLIR


Doppler radar is specifically adjusted to detect the frequency change of echoes returned by moving and stationary targets.

The Quantum 2 then distinguishes moving targets with colors to indicate whether they are approaching or receding.

  • Approaching targets are colored red.
  • Receding targets are colored green.

Color-coded targets make it easier to detect moving traffic among other stationary targets such as land, aids to navigation, and stationary or anchored vessels.



Leave a Comment

Your email address will not be published. Required fields are marked *

Are you already a subscriber?

Sign up for our Newsletter

Join the Sailing Newspaper Club

Powerboats, its stories, from small open to motoryachts. Sign up now for our free newsletter and receive the best news selected by the editorial staff each week. Enter your email below, agree to the Privacy Policy and click the “sign me up” button.

Once you click on the button below check your mailbox



You may also be interested in.

Sessa Marine F60

Sessa F60, new flybridge arrives for cruising (17.9 m)

Among the world premieres scheduled for the now approaching Cannes Yachting Festival, scheduled for September 10 to 15, a new 60-foot sporty flybridge by Sessa Marine will also be unveiled for enthusiasts. Sleek in lines, 17.93 meters long and fast