1. Introduction 1
1. Introduction
1.1 Function
The JLN-550 Doppler Sonar is a system with one transducer mounted on the bottom of the vessel
which direct beams of sonic radiation at an angle downward and measures the water speed and
ground speed by using signals that are reflected from the sea bottom or an underwater layer.
It measures the speed along two different directions: longitudinal, bow transverse.
It calculates the speed stern transverse using the ROT(Rate of turn gyro) signal.
It also measures and display run distance.
Figure 1.1 Doppler Sonar
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