The Design And Implementation Of Underwater Acoustic Buoy System Based On ARM

Undertaking important functions in the field of oceans scientific research, the buoysystem is an effective tool and mean of various oceans observation. As an important tool ofunderwater acoustic science research, the underwater acoustic buoy system can be effectivelyacquired acoustic and other information. In order to fit the experimental requirements in acertain oceans sound field, a practical, reliable, cost-effective, reusable underwater acousticbuoy system which has four channels is designed and implemented.The design in this paper consists of three parts: buoy body, self-contained signalpreconditioning and data acquisition storage circuit, and the software. The structure of thebuoy body which uses PVC-U material is designed. This kind of structure has a lot ofadvantages, such as light weight, corrosion-resistant, good watertight performance, easylaying and recycling and so on, also has a stable and reliable posture in the seawater. As thecore part of this paper, self-contained signal preconditioning and data acquisition storagecircuit selects dual op amp chip LT6011with the low-power and low-noise which isresponsible for the signal preconditioning circuit design. The signal preconditioning circuitincludes pre-amplification, filtering and differential output amplification. While for the dataacquisition storage circuit, a32-bit STM32series ARM chip is used to control theanalog-to-digital conversion chip ADS1274which can acquire the differential output signaland store them to TF card. Moreover, placed in buoy system, the GPS module providesaccurate time by GPS second pulse to the ARM chip. So that GPS information is saved to TFcard and at the same time transmitted via wireless transmission module to the host computeron the receiving ship. The buoy system can change the sample rate and operating mode bychanging the configuration file in the TF card, of which the software design is discussed indetail in this paper.Finally, through the test, tank experiment and sea experiment, this buoy system is provedto be easy to use, reliable. The acquired data is well. As a result, this buoy system achieves thedesign requirements.