Multi-laser Range Finder System Base On FPGA

According to the statistics by ministry of communications, traffice accidents increase annually, which leads to not only property loss but also safety danger. As a result, it becomes a focal point to avoid traffice accident, among which automobile safety system is a keystone for both automobile manufacturers and research organizations.The current automobile safety system can be categorised as two kinds. 1, passive system, e.g.safety belt, ballonet, etc. 2, initiative system. It can be devided into initiative passiveness and initiative automatism. And ABS and anticollision system can be taken as example for each.Based on LASER ranging system, Initiative Anticollision System when automobile is speeding on highway is going to be developed. The emphasis of this paper is to develop early warning system for ranging. By using LASER ranging chip and incept chip and taking FPGA as main chip, early warning system for ranging will monitor front automobile effectively and suggest or warn driver to decelerate or brake based on monitoring data, so as to avoid collision.The major tasks include:1) Based on the analysis of laser ranging, radar ranging and millimeterwave ranging measurments and market needs plus potential customer, laser pulse ranging measurement is determined. Targeted at the technical problems, FPGA is proposed as critical control module of this ranging system project.2) According to the basic requirements of precision, frequency,and range of dynamic ranging system, and combined with the feature of laser pulse ranging measurement, multiple pulse and cycle ranging program is proposed which can improve the precision and range, and decrease the cost.3) Based on above program, detailed design of functional modules, experiments of simulation, comprehensive optimization and board test are finished. Those experiments show that major functional modules meet the expected desigh requirements and establish the fundation for further development. 4) Finished the design, making, equip and debugging of photoelectric transformation circuit,power supply circuit and communication port of sensor for laser ranging system.5) Last but not least, this paper sμmmrizes the research work and puts forward the weakpoint of this system as well as the direction of further research work.