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The Key Technology of Highway Driving Assistant System in Foggy Days Based on Ultrasonic and GPS

Author: ZhangKunPeng
Tutor: SunJunQing；WangZi
School: Tianjin University of Technology
Course: Applied Computer Technology
Keywords: Ultrasonic wave GPS Embedded Linux operating system Fog. Auxiliary system
CLC: U463.6
Type: Master's thesis
Year: 2008
Downloads: 153
Quote: 2
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Abstract


In recent years, people's income levels rapidly improve cars as a means of transport used by more and more people, and followed the car safe driving issues are becoming increasingly attention. Part of the highway in heavy fog, the government would resources enclosed This method reduces the heavy fog driving safety issues, but was a waste of national resources, how both safe and economical solution automotive heavy fog traveling into many transportation departments to consider. With the rapid development of micro-electronics technology, computer technology, the embedded system is being applied to more and more areas, and also a very good application in the field of traffic safety. Ultrasonic distance measuring equipment has the advantages of high reliability, low cost, send ultrasonic digital ultrasonic ranging anti-jamming and security to strengthen the use of digital modulation techniques. With the GPS to locate the car the enhanced convenience fog., Real-time remind the driver the motorway exit location information. In this context, the article has designed a foggy day driver-assistance system based on ultrasonic and GPS solutions. Key technologies for embedded Linux-based system, to use the Samsung S3C2440 embedded chip as the main control chip, relying digit recognition in their own independent design of ultrasonic ranging module with the GPS module on the highway with fog auxiliary systems Research and design. Specifically to do the work of the following aspects: 1. According to the technical requirements of the fog. Auxiliary systems using frequency shift keying technology designed ultrasonic digital identification Ranging Module. Module uses a microcontroller to control the software algorithm design consists of two main parts, the first part of the communication protocol design, digital modulation transmitter ultrasonic signal, the second part of the ultrasonic signals by means of finite state machine design digital signal demodulation algorithm to achieve understanding tone than for sending and receiving the information content and the calculation of the time difference, the final completion of the digital identification ranging task. 2. Study GPS packets agreement, designed GPS packet data extraction algorithm, the car location, car travel speed and other information through the GPS module. With ultrasonic numeral recognition module and GPS module designed the highway fog. Auxiliary systems. Ultrasonic digital Identity Module is used the front ranging and left Ranging, GPS for positioning and speed. Each module using the universal asynchronous serial interface with ARM9 embedded microprocessor S3C2440 communication. Embedded Linux operating system on each module overall scheduling, the final results by using the QT interface designed to display output to the user.

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