0 equipment, especially on a ship, that uses sound waves to discover how deep the water is or the position of an object in the water, such as a group of fish -- 聲納（一種聲波探測儀器，用聲波測定水的深度或水下物體的方位）
In particular, the book is aimed at signal processing practitioners, especially research workers and students working in areas of radar, sonar, telecommunications and biomedical engineering.
Each receiver of advanced sonar ring localizes multiple targets on one firing.
Each sonar transmits a number of pulses fired in sequence, the exact number of which is determined by a unique code.
The mobile robots may navigate by means of a number of monitoring systems such as the sonar-sensing system or the visual-sensing system.
This procedure makes use of past sonar readings stored in the occupancy grid map.
Side-scan sonar and seismic methods have been used widely to map these topographic structures.
Observations are made using an imaging sonar that scans the horizontal plane around the vehicle.
They include, for example, mappings of two- or three-dimensional images such as portraits or underwater sonar scans into other images for comparison.
