ET Gravimeter Data Collecting System Based on GPRS

To meet the needs of researches in earth tides, polar motion, free oscillation of the earth, etc., we design an long-distance data collecting system for the ET gravimeter. The system collectes the data of the ET gravimeter and the temperature, humidity, atmospheric pressure etc., to which the ET gravimeter is exposed, and then saves them to multimedia card. The system can receive the command from and transfer data to an observation center by wireless. The rapid development of modern wireless communication technology has brought great convenience to long-distance data collecting systems. In the research of geophysics, the ET gravimeters are often placed in the observation stations far away from cities for long-term observation. In these places, not only the observers' lives are inconvenient, but also the observation costs are greatly boosted. Therefore, we have developed the ET gravimeter data collecting system based on GPRS. GPRS is the short name for general packet radio service, which is a kind of packet exchange data load and transmission mode developed on the basis of GSM, has the merits of high data transmission speed, high communication quality, 'always on-line', charging according to flow, etc., and is widely used. This article is divided into 5 parts: in the first part, the motivation and the purpose of this job are introduced; in the second part, the constitution and working principles of the system are described; in the third part, introduction are made for the implementation approaches of GPRS in the system, as well as the hardware design of communication modules; in the fourth part, the program design of system is stated, including the communication program of data collecting systems and observation center; in the last part, it's the conclusion for this job.