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Personal digital assistant (PDA) with built-in GPS chip begins to be used for city management and emergency response
management nowadays. The intelligent terminal can be used for event recording, multimedia (photo, audio, and video)
capturing, wireless communication, GPS positioning and navigation. In the near future, PDA would take place of the
vehicle GPS monitoring terminal to provide more functions and convenient. This article organizes the PDA of the same
team for emergency response event into an integrated network through wireless communication so that each terminal can
see each other on the map, including the vehicle GPS monitoring terminals. All of the terminals should send its GPS
position and collected information to the emergency response center (ERC) through GPRS with a customized protocol.
Then the center would create the socket connection to push the neighbors' location and common or special information
to the others in the team according to the terminal's requirement and its authorities, and the leader or commander could
send commands and messages to all of the underling members also. The GNSS based positioning and communication
network organizes the dispersive emergency response personnel handheld with PDA and vehicles equipped with vehicle
GPS monitoring terminal into an organic and cooperative network, each member in the network can see where its
colleagues are, so as to seek for the help or support and exchange information in real time without calling which avoids
exposure to the tracked objects. The Compass-1 satellite positioning and communication terminal is also used for
personnel and vehicle positioning and message reporting. Altay is selected as the demonstration area. The prototype
emergency management system is established for the local public security bureau and well validates the terminals
and network function.
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