The Design Of Data Acquisition System For Drifting Float

The Ocean's observation is foundation of the understanding of theoceans, marine research, development and utilization of oceans. The ocean observing equipment is tool and instrument of ocean's observation. The drifting buoy is a small hydrometeorological observation platform which can continuously collecte hydrometeorological data and satellite position data, and transmit the data to the receiver. The drifters are used for measure the ocean current in the ocean observations, which are characteristic of small size, light weight, security and the convenience of deployment. And its continuous working time can be from some months to two years.Being restricted in the size, working time and disposable of the drifters, the data acquisition system must reduced to the smallest possible size, consume low power and cost less. In response to these requests, this paper gives a design of data acquisition system of drifting float which low-power, small-size and low-cost. This paper studies the following question: the low-power and low-cost design of software and hardware, the selection of the device. The focus on the low-power design of the software and hardware.In order to meet the system requirement, taking into account the current low power consumption and miniaturization trend of development, a 16-bit low-power mixed signal processor from TI, MSP430F149, is selected to realize main control function. Some low-power electronic devices and sensors is used, such as FM3130, SP3819, MS5534B. Power for MCU peripheral devices is controlled in real-time. And low-power also is a very important rating standard apart from performance and size when sensors are choose. Electromagnetic relay is discarded for its high power consumption when choose and design relay, a kind of low-power relay which uses 2 MOS is designed. In addition, requirement of low-power is sufficiently considered when design software. System clock is set to 32768Hz. System is constantly in sleep mode, and is waked up by external interrupt. Power for peripheral devices and sensors can be shut down in time.Experiment in laboratory continues for 5 months, and manifests that the performance of the system is achieved design target, and the system can be run stably and reliably, and the power consumption is very low.