基于NVMe的超高速多通道遥感相机模拟源设备研制

Development of an ultrahigh-speed multi-channel remote sensing camera simulator based on NVMe

摘要:

针对当前遥感卫星电荷耦合器件(CCD)相机幅宽越来越大，速率越来越高，现有相机模拟源设备数据输出带宽不足的问题，提出并实现了一种基于非易失性存储器Express(NVMe)的超高速多通道遥感相机模拟源设备。该设备利用现场可编程逻辑门阵列(FPGA)实现4组NVMe SSD主机控制器，完成对固态硬盘(SSD)的读写操作；同时利用DMA控制器读取DDR4中缓存数据，数据经封装处理后通过光纤接口输出。实验结果表明：NVMe主机控制器的写平均速率可以达到1.7 GBps，读平均速率达到3.2 GBps。模拟源系统整体存储容量8 TB，对外输出带宽高达80 Gbps，支持8路光纤接口输出。该模拟源具有较强的稳定性及良好的可扩展性，已成功应用在某遥感卫星CCD相机模拟源系统中，为数传等设备的测试以及调试提供了充分保障。

Abstract:

Aiming at the problem that the current remote sensing satellite Charge Couple Device(CCD) camera has an increasing width and speed, and the output bandwidth of existing camera simulator is insufficient, an Non-Volatile Memory express(NVMe) based ultrahigh-speed multi-channel remote sensing camera simulator is proposed and implemented. This simulator employs a Field Programmable Gate Array(FPGA) to implement four groups of NVMe SSD host controllers and complete the read and write operations on the Solid State Drive(SSD). The Direct Memory Access(DMA) controller is utilized to read the cache data in DDR4, and the data is output through the optical fiber interface after being encapsulated. Experimental results show that the average write rate of the NVMe host controller can reach 1.7 GBps, and the average read rate can reach 3.2 GBps. The overall storage capacity of the simulator is 8 TB, the external output bandwidth is up to 80 Gbps, and it supports eight-way optical fiber interface outputs. This simulator with strong stability and good scalability, has been successfully applied in a remote sensing satellite CCD camera simulator system, which provides sufficient guarantee for the testing and debugging of device such as data transmission.