基于FPGA和DSP的高速数据采集实时处理系统的设计

Design of High Speed Data Collecting and Processing System in Time Based on FPGA and DSP

为实现激光目标回波的快速捕获、检测及实时处理,提出一种ADC+FPGA+DSP的数据采集与实时处理的设计.激光回波通过高速模数转换器(ADC)转换成数字信号,经FIFO乒乓高速缓存,然后再送到DSP进行实时处理.电路简单、可靠、实时性强,最高采样率达200MHz,具有8bit垂直分辨率,4M×8位数据存储空间.该系统能准确实时地计算出目标距离、速度,适时预警,符合汽车防撞激光雷达中信号处理的要求.详细介绍了系统的设计方案及各主要组成模块.

The design of high speed data collecting and processing system based on ADC＋ FPGA ＋ DSP is introduced in order to capture and detect quickly the lidar＇ s echo and process in time. The lidar＇ s echo is converted to digital signal by the high-speed ADC and is buffered by FIFO using PingPang mechanism in time. The digital signal is real-timely processed by the digital signal processor （DSP）. The design is simplified, reliable, real-time. It has the 200 MHz sampling rate, 8 bit vertical resolution and 2 M× 32 bit off-chip memory with realizing several kinds of trigger mode such as instantaneous triggering Post-trigger or Pre-trigger and software trigger. The system can accurately compute distance and velocity and real timely give an alarm in advance. It can exactly calculate the distance and speed of the object and raise the alarm in time. The scheme of the system and the main modules are presented in detail.