Application Research Of The Mobile Phone Terminal Based On Beidou Information

Satellite navigation terminal has been deep into every corner of our life with the rapiddevelopment of satellite navigation system. Beidou satellite navigation system is with the featuresof navigation and positioning, timing, user monitoring, short message communication. With theconstant expansion of Beidou application area, people are increasing demand for high technologyof Beidou information terminal. China navigation and positioning terminal has a great marketpotential. Beidou is a satellite navigation system built by China with independent intellectualproperty rights. It not only gets rid of the dependency of foreign satellite system, but also breaksmonopoly of GPS technology, so it has a far-reaching significance for application research ofmobile phone terminal based on Beidou information.Firstly, this thesis puts forward significance of Beidou information system, analyses currentsituation of navigation and positioning at home and abroad, elaborates the principle of Beidouinformation system and some key technology. Propose the technology of mobile phone terminalbased on Beidou information and design scheme. Terminal is made of three parts, including radiounit, baseband unit and display and control unit. Terminal realizes continuous navigation,positioning and speed measuring function. Radio unit uses triple-band antenna to completereceiver for Radio Navigation Satellite Service (abbreviated as RNSS) signal and RadioDetermination Satellite Service (abbreviated as RDSS) signal transceiver. Bm3005chip handlesRDSS signal and BP2007chip handle RNSS signal under the control of Digital signal processor(abbreviated as DSP) in the baseband unit. Baseband unit with Bluetooth and RS232interfacestransport data to the specified display and control unit by Bluetooth and sends the data tocomputer through RS232interface. Bluetooth communication combines baseband unit withdisplay and control unit in this system, completes wireless interconnection between baseband unitand displayand control unit. The hardware platform of display and control unit of terminal systemselects the S5PV210application processor as the core. The S5PV210processor clocked to1GHzmeets the needs of this terminal system with the characteristics of rich interface and highperformance computing.Secondly, this thesis presents the software design of mobile phone terminal based on Beidouinformation. The software of mobile phone terminal based on Beidou information is made of twoparts, including baseband software and terminal display and control software. Baseband softwareuses uC/OS-II based on embedded platform of embedded real operating system. Baseband software has the functions of capturing, timing, sampling, navigation message parsing andlocation solution. After processing the navigation data, terminal display and control softwarereceives valid data though Bluetooth transmission. Terminal displayand control software based onAndroid has Bluetooth. After pairing of Beidou Bluetooth equipment is successful betweenterminal display and control software and baseband software and transports efficient data eachother in the Bluetooth driver. In the process of Bluetooth communication, call API function ofBluetooth to finish the connection between baseband software and terminal display and controlsoftware. Bluetooth mobile phones displayand handle data stream.Aiming at above design, this paper finishes data validity testing after baseband softwareprocessing, introduces the terminal displayand control software interface design and tests terminaldisplayand control software.Realize that when there is no mobile phone signal out of door, peoplecan use it to navigation and positioning precisely and sends short message each other. Comparedwith traditional navigation equipment, the terminal has good operability and practicality. It willachieve better economic and social benefits for portable and better and good value for money inthe civilian market inthe future.