The Design And Implementation Of Laptop Positioning System Based On GPS/BD/GSM

With the development of science and technology, the Laptop is getting more and more popular, and it has become an important part of our life and work. But at the same time, we are also taking more risks. Once the laptop is lost, the economic loss of the laptop itself is the first risk we will face. What's more important is the datum loss and leakage along with the lost laptop, these losses may be related to personal privacy, work result and trade secret, which are inestimable. Due to these reasons, it is very necessary to find the lost laptop by positioning technology. Among the positioning technology, Global Positioning System(GPS) has high location precision, but is unavailable in sheltered places. BeiDou(BD) has less precision than GPS in location, but it is developed by our country independently, and it can position and communicate at the same time. Global System for Mobile Communications (GSM) has less precision in location than GPS and BD, but it is available in sheltered places, and it has very mature communication function. After full study on GPS,BD and GSM location technologies, this article proposed a new laptop positioning system based on GPS/BD/GSM.The system consists of two parts, one is location terminal, the other is the location monitoring service center. the location terminal contains one location and communication board, which can be inserted into laptop miniPCIe slot, it can make use of GPS,BD and GSM location service and communicate with the location monitoring service center (by GSM and BD). For the location monitoring service center, there are two kinds of mode for different users. One is small group mode (for users of individual or small unit), this kind of users generally do not have too much money, and it is unnecessary for them to build an extra formal service center, they only need one phone which can send and receive short messages. The other is large group mode(for users of large unit), this kind of users need to monitor more laptop, so we need to build a formal service center, with communication equipment and monitor platform. The communication equipment is used to communicate with the positioning terminal, its functions include sending requests to the positioning terminal for obtaining position information, and sending requests of data protection to ask for remote protection for the terminal's data. The monitor platform is a management platform based on Geographic Information System, its functions include creating electronic map for monitoring, performing location query and trajectory query for the location monitoring service center. With these functions and features, this system can make it intuitive and convenient for users to locate terminal and protect the datum they care about.