基于 SD 卡的单光子激光雷达数据存储设计

A new data storage design applied in a single-photon LiDAR system is efficiently achieved based on SD card with the help of Xilinx FPGA platform. In response to the data characteristics of single-photon LiDAR, it is verified that the SD card, through the DDR3 chip, can effectively perform the role of peak shaving and valley filling in the SPI mode of version 2.0. This ensures that a single SD card can stably operate at a maximum write rate of 5 Mb/s. Furthermore, it is demonstrated that utilizing a multi-SD card expansion approach can further enhance the write speed and increase the storage capacity to over 0.5 TB. If the operation SPI mode is upgraded to version 3.0, the storage capacity of a single card can reach 2.0 TB theoretically. This storage system has been successfully applied in the imaging experiments of single-photon LiDAR. Due to the advantages of SD cards, such as lightweight, stability, and anti-interference, the new storage solution shows significant improvements in terms of data capacity, integration, energy consumption, and cost compared to current conventional solutions. The SD card storage solution is highly cost-effectiveness and enables mass production of single-photon LiDAR. This new data storage solution has advantages in practical applications of low-load, highly integrated single-photon LiDAR products such as UAVs, shipborne LiDARs, and vehicle-mounted LiDARs.