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 SkyRadar introduces a sonar extension to the NextGen 8 GHz Radar allowing students to compare the sonar and radar image when beaming at the same target. 

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With the increasing importance of the oceans in various aspects of our life, the role of sonar also increases.

It is used for Navy applications, in fishery, for depths measurement in commercial shipping, for rescue missions when sunken vessels need to be allocated, or for many scientific applications like biomass estimation of water velocity measurement.

A sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface.

The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up.

Sound travels faster in water than in air. The speed of sound in air under typical conditions is about 343 meters per second, while the speed of sound in water is about 1,480 meters per second.

We build a dual source based on our our NextGen 8 GHz radar. Optionally, users can add  single-beam echo-sounder that measures distances up to 30 meters (100 feet) underwater. It has a 30 degree beam width, 300 meter (984 foot) depth rating.

You can compare radar and sonar sources in the PPI, the A-Scope or the B-Scope.


Here you find some key specifications on our sonar source:

  • Frequency 115 kHz
  • Beam width: 30 degrees
  • Minimum Range: 0.5 m 
  • Maximum Range: 30 m 
  • Range Resolution: 0.5% of range
  • Range Resolution at 30 m: 15 cm
  • Range Resolution at 2 m: 1 cm 

It is a simple form of an sonar, but very illustrative in learning purposes. In conjunction with the radar it will be used in the air.

It operates by using a piezoelectric transducer to send an ultrasonic acoustic pulse into the water (or air) and then listens back for echoes to return. With that information it’s able to determine the distance to the strongest echo, which is usually the ocean floor or a large object.

It uses a 115 kHz transducer frequency, away from those used on most boat echo-sounders to avoid interference. It has a measurement range of 30 meters (100 feet) and a measurement beam width of 30 degrees.

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