Design Of The Automotive Anti-collision Signal Processing System Based On FPGA

Active, modern optical remote sensing of laser radar, with its superior performancein terms of military, vehicles, weather forecast has been widely attention and application.One-dimensional scanning lidar compared with other car front of laser radar system, thestructure is simple, easy to imaging; Compared with the later depending on the laserradar, wide range of application, effect is remarkable. Paper based on the FPGA torealize the one-dimensional scanning laser automotive anti-collision radar signalprocessing system, clear design, chip of low cost, fast imaging, the automotiveanti-collision radar can be applied to system, reduce unnecessary collision between carsand workshop.Paper first to the automotive anti-collision signal processing system based onFPGA is studied, papers on a piece of FPGA implementation at the same time show thefunction of the intensity image and range image, the automotive anti-collision systemusing multiple chips and changed the original plus a camera device can realize rangingand imaging features of structure design. In order to simplify the hardware systemstructure, this paper uses the function of the software to take the place of the hardwarepart, so that the follow-up of PCB layout is more easy to implement, to reduce the errorof the layout, provides the stability of automotive anti-collision system.Papers with20kHz square wave pulse driving laser emission laser, using DACproduces50Hz sinusoidal vibration control galvanometer. Both can work together tomake laser one-dimensional scanning of target object, the reflection echo signal throughthe AD603amplification, enlarged the echo signal sent to the peak hold circuit for pulsebroadening, broadening the pulse is easy to ADC after collected, overcome thedisadvantage of the echo acquisition is less than, referred by the strength of the ADCoutput into the FPGA processing, finally the intensity image on VGA display.Traditional ranging model generally adopted professional range of chips for rangedata, relatively complex, high cost, the paper to the traditional method was improved,using software instead of hardware to realize the high speed range, the ranging accuracycan reach5ns, the minimum distance of3m. Using FPGA with PLL frequencymultiplication phase-locked loop clock, time accuracy can be achieved after high speedrange. Using8-bit ADC, strength precision can reach10mV. Finally will get thedistance data display on VGA, the signal needs to be synchronized to display datacorrectly.