Sonar Multibeam Technology: A Look Inside

Sonar Multibeam Technology: A Look Inside

SONAR is an acronym for a device that uses sound in the water column to detect objects (Sound Navigation and Ranging). Active sonars generate their sound waves and evaluate their waves (echosounder). Single beam sonar and multibeam sonars are active sonars. The topography of the soil may be seen underwater using multibeam sonar.

Multibeam Sonar Operation

A projector transmits sound waves that the recipient or hydrophone has captured on the following premise. A transducer may produce and receive sound waves simultaneously. The depth or bottom type can be defined by the wave’s travel duration or energy. The transmitted frequencies decide the outcomes. Low frequencies can exceed high frequencies as they are less absorbed. Low frequencies, therefore, monitor a broader region with a lesser resolution than high frequencies.


Multibeam sonar may produce several narrow beams. The transducer is mounted in the key of the vessel and has several sound waves. Therefore, the seafloor is scanned with a continuous line perpendicular to the direction of passage of the vessel. The width of each line on the ground equals the length of the swath. It can be represented in meters or as the angle of the line (in degrees).

The transducer determines the time and energy difference between sound waves generated and reflected. The depth and characteristics of the seabed may thus be determined by the fact that a smooth and firm surface reflects more waves than a slanted surface.


In addition to the ocean floor, a vessel with a multibeam sonar may scan the properties of the water column. The emitted beams interact with the particles in the column of water to create their reflections. The quantity of reflected energy is intuitively related to the number of particles in the water column. In actuality, both size and type of particles and frequency of transmission are essential. Many studies are now being done into the relationship between water column multibeam data and turbidity. Just click here to learn more.

Sonar: Multibeam versus Single Beam

With beam widths changing between 10 and 30 degrees, a single beam system measures the distance between the main beam and seabed and the shortest gradient. In a sequence of measures along fixed azimuth multibeam (swath sonar) systems, determine slant range and elevation angle. This approach is recommended since it measures the entire seabed region instead of only one line. The only question now is what marine sonar is the best for your needs. Gladly, R2Sonic got you covered. 

In several scenarios, a Multibeam Sonar can be employed.

  • Dredging or construction undersea.
  • Generate a bathymetric map which R2Sonic multifrequency bathymetry technical mode gives the best results.
  • Mapping the water column turbidity.
  • Aquatic habitat mapping.
  • Cartography of submarine cultural heritage.



Multibeam echo sounders benefit from a narrow acoustic beam fan scan of the bottom to cover the whole seabed. The resultant seabed maps are detailed in comparison with single beam mapping. The maps are produced faster, reducing the time required to survey the ship.

Multibeam sonar is the best way to map underwater as it gives the best results.

2021-08-31T15:22:39+00:00 July 24th, 2021|Payments|0 Comments