The Design And Realization Of The Vehicle-carried GPS Terminal With Taking And Sending Pictures

With the development in chinese economy,automobile already is more and more popular. From pubic transit system's coach to taxi convenient for citizen's traveling and sedan, the phenomena that they play a more and more important role in our life show the relation between us and automobile has being become more and more close. However, the phenomena also bring a lot of troubles, such as overload for the long distance auto, the taxi driver's safe, the private car guard against theft. In order to solve these problems, the paper puts forward a new kind of device. This device,is called ,can not only take a picture but also send this picture to the monitoring center.The device can take a picture inside the car with the OV7640 cammera and can compress the picture.Then it will be delivered by the GPRS module (the Q2406B of the WAVECOME) to the monitoring center. The project's characteristics can be shown as follows:1. The LPC2138 (a kind of micro processor) which be adopted in the design belongs to the ARM7TDMI-S kernel, not only have UART , I2C bus, SPI bus etc, but also have the processing speed up to the 60 MHz, the 512 KB FLASH and the 32 KB RAM. Under situation of satisfying a design a demand of design, the design can reduce cost as much as possible.2. The design adopts the high-speed asynchronous FIFO of the CYPRESS. It has the 64K words by 9-bit wide first-in first-out (FIFO) memories. As the buffer of the picture data in this design, it can provide the larger the memory for storing picture.3. The design has optimized the JPEG base-line arithmetic. Several feasible optimized arithmetics, which are adapted in the GPS auto carried terminal, have been choiced in the design. As a result, it improves compressing ratio and reduces delivering cost.4.μC/OS-II is adopted in this design. The design has added and improveed some system tasks in the existing automobile's GPS terminal. With the improvement, the system's ability in real time requirement has been advanced.Constantly trying and improving on the design method, the device finally finish taking the picture in the automobile and send it to the monitoring center. Making use of these picture data, the design strengthens a supervision ability of monitoring centre to automobile and safeguards the Human body and the property safety of passenger inside the automobile.