With the development of science and technology, the area of people acting is enlarging gradually. In order to effectively improve the safety of people and equipment, especially for those engaging in the offshore fishing and field operations, an advanced satellite positioning and call system is designed in the paper.The main function of system is to obtain GPS data by the GPS module from the satellite, and then the information of location, time, speed and the situation of satellite online is displayed through the displaying terminal in real-time.Also the information will be uploaded to control center by satellite communications module after fixed time or fixed distance. At the same time the system should receive information and commands from control centre by satellite communications module.The weather forecast and news from control center are displayed. Under the dangerous situation, the latest location information is uploaded immediately to the control center by startup of the alarm button. This system can store a certain amount of historical information.The theory of GPS satellite positioning is introduced in detail in this paper. Besides a brief introduction of the principle of satellite communications, the ARM embedded systems and the invironment of ADS for hardware development are introduced in detail. On the basis of that, the paper describes how to realize the satellite positioning and call system in software and hardware.The core of control is AT91SRM7S64 in the design of the satellite positioning system of this paper. Classic HX-87 module is selected on GPS module. Satellite data communications is implemented by the Iridium SBD9601 module. The information is displayed by an intelligent terminal of serial port and 240 * 128 points.This paper supplies a practical way to design a set of satellite positioning and calls system . It is the first time that the module of Iridium system for communication is used for the satellite positioning and call system in our the country. The practical products are testing and the results are exciting.
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