Arm-based 3g Car Driving Recorder

With the development of the automobile electron and modern traffic, The Vehicle Traveling Data Recorder has already been chased and progressed into the electronic field of the automobile, has already become an indispensable part of modern transportation. It can record the state that can be analyzed to appraise the traffic accident, improve the capability of the law of traffic administration , ensure the vehicle operation security. The domestic recording instrument is inclined to the single type mainly at present, namely only possess and record the important data of vehicle.This design is to increase functions, such as GPRS, GPS and USB host system, etc.. On the basis of original recorder. It can realize remotely controlling and navigating of the vehicle.Firstly, the author introduces the application backgrounds, current situations of domestic and international research of The Vehicle Traveling Data Recorder and also the content needed studying in this design and function realized finally. Secondly, the author introduces the whole design plan of the system, carries on deep research and design in gathering and recording the data, making a reservation of GPS satellite, wireless data transmission of GPRS and USB host system ,etc.. This system adopts the FRAM memory as the storing equipment in which the automobile the real-time data store. It can accurately record the course data took place in the story and keep for a long time. It adopts the special chip of GPS of USA to realize the measurement to important parameters, such as travel speed of automobile, direction, etc.. It can realize the real-time data transmission of automobile and remote controlling by M22 GPRS module which includes TCP/IP. It makes use of SL811HST to realize USB HOST function, gets the data from recorder conveniently and swiftly through U disk. Have done more detailed explanation in the key technology of USB Host. Such as enumerating device, Bulk_Only transmit protocol and FAT16 file system. Finally, summarize the all design, point out that needed improvement the prospect of the future of The Vehicle Traveling Data Recorder.