Fish detection sonar working principle
- May 28, 2018 -
Unlimited intelligent sonar fish finder _ fish sounding 呐 working principle, sonar finder fish ultrasonic finder, and nan fish. In the river. Depth and so on. A sonar fish finder fills you as a fish finder. It is a kind of auxiliary accessory to watch the fish and is suitable for fishing or fishing in places like fishing enthusiasts such as Lake and Sea. It is convenient for you to judge the depth of water, the depth of fish or fishes, and so on. Sonar technology is based on the principle of sound transmission. The fish finder uses acoustic sonar positioning to detect the state, profile, and composition of the bottom of the water; and the depth of water (from the bottom of the probe); the sonar fish finder relies on sound waves after the waves are emitted. Measure the distance by touching the object's return time; at the same time, through the reflected sound wave signal, the ultrasonic fish finder can recognize the position, size and composition of the object; use the ultrasonic transducer to transmit the signal and spread through air or water. Ultrasonic wave is used to contact the feedback signal from the object in the water, then processed by the internal processor, and finally displayed on the screen; the transducer array is stationary during operation, and the horizontal direction is 360° by the electronic switch and the electronic phase control technology. A certain range of sound pulses are emitted, and then a portion of the elements of the transducer array are used to form a narrow receive beam that rapidly rotates and pitches in the horizontal direction. Since the electronic scanning speed is much faster than the mechanical step scanning speed, the search speed is greatly improved. It can provide real-time panoramic display, get more fish school dynamic information, easy to identify, select and track multiple targets. However, due to the rapid scanning of the beam in space, the received echo energy is lost. To this end, it has adopted a combination of multi-beam and electronic scanning technology, developed into a multi-beam scanning sonar.
Due to the complexity of the sonic propagation route of fishery sonar, which is greatly affected by the sea state, and due to the diversity of the fish groups and the reflection characteristics of the sound waves, the structure of the fish sonar is more complex than that of the vertical fishfinder. many. At present, the effective exploration fish can reach a distance of about a kilometer in the shallow sea area and several kilometers in the deep sea area. The operating frequency is generally between 20 and 200 kHz.
Sonar surveying fish consists of transmitters, receivers, terminal displays, transducer arrays, etc. Its working principle is similar to that of vertical fish surveying instrument. The difference is that the vertical fish finder only provides information on the fish below the fishing boat vertically, while the sonar can achieve detection in all directions around the fishing boat, providing the orientation, distance, depth and speed of the fish. The information, its effect distance requirements as far as possible, resolution requirements as good as possible.
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