基于FPGA的激光雷达数据采集卡设计

Design of lidar data acquisition system based on FPGA

激光雷达作为大气探测的有效手段之一,逐渐向小型化、轻量化的趋势发展。针对激光雷达的功能专用性,基于现场可编程门阵列(FPGA)对探测、采集系统进行了集成优化设计。逻辑中各模块之间通过握手协议和同步有限状态机有序配合完成数据链路的构建和传递。系统以FIFO作为ADC的数据存储器,通过AXI总线协议配合Xilinx MIG IP有序将FIFO的数据突发缓存到DDR中,并且通过千兆以太网完成对采集数据的传输。该激光雷达数据采集卡集成光电倍增管增益控制和回波信号采集功能,并采用兼容性硬件和逻辑设计,具有集成度高、增益调节便捷且精度高、采集快速方便以及快速适配等诸多优点。

As one of the effective means of atmosphere detection,lidar is developing towards miniaturization and lightweight.In view of the function specificity of lidar,the detection and acquisition system is integrated and optimized based on field programmable gate array(FPGA).The handshake protocol and the synchronous finite state machine are used to complete the construction and transmission of data link between modules.FIFO is used as the data memory of ADC,FIFO data is burst into DDR orderly through AXI bus protocol and Xilinx MIG IP,and the transmission of the collected data is completed through Gigabit Ethernet.The data acquisition card of lidar based on FPGA integrates the gain control function of photomultiplier tube and echo signal acquisition function,and supports the compatible hardware and logic design.Therefore,it has many advantages such as high integration,convenient gain adjustment and high precision,fast and convenient acquisition,and fast adaptation.