The Design And Realization Of Digital Walkie-Talkie Monitoring Terminal

As the rapid development of intelligent transportation systems, people want the performance of the vehicle monitoring system become more and more better. Various types of vehicle monitoring system are developping continuously, from the traditional monitoring system based on GSM short message service as the data communication mode to the new monitoring systems, which use GPRS to realize real-time data communication, and the performance is getting better and better.This thesis analyzed the market information, used the GPS global position system, the micro computer science and integrated the modern GPRS to develop a digital walkie-talkie monitoring terminal system.This monitoring system's terminal on car used the micro controller MSP430 as the core,and the embeded c program to accomplish the adapter driving,link control,network transmission and service application which is required by GPRS network transmission,and consequently realized using GPRS technology in GPS satellite position system on car. The sound sampling and compressing were accomplished by Sunplus micro controller's flexible sound function. Sound data can be transmitted wirelessly by monitoring terminal on car,so that transmmitting via monitoring center can realize tall-back between teminal and terminal or terminal and monitoring center.This system has many functions, and can be clipped or extended easily, it can be customized according to different needs of customers, It can not only satisfy the customers,but also save the cost for customers. Use GPRS wireless network to realize digital sound tall-back is not confined by area,so it can accomplish sound tall-back or sound broadcast in large area,also,its cost is low.