针对航天光学遥感成像系统输出通道多、输出速率高的特点,提出一种高速、多通道CCD图像数据并行处理与传输系统的设计方案。该方案以FPGA为数据处理和控制核心,采用基于FPGA区域并行处理的数据处理方法,运用FPGA内部块RAM构建高速多通道...针对航天光学遥感成像系统输出通道多、输出速率高的特点,提出一种高速、多通道CCD图像数据并行处理与传输系统的设计方案。该方案以FPGA为数据处理和控制核心,采用基于FPGA区域并行处理的数据处理方法,运用FPGA内部块RAM构建高速多通道CCD图像的缓冲区,在存取控制上采取区域缓存和时分复用的策略完成对高速多通道CCD图像数据的实时处理;而对高速多通道CCD图像数据的传输采用基于Channel link高速差分串行传输技术,以高速差分串行的LVDS(Low Voltage Differential Signal)数据流替代传统的并行"TTL/COMS"信号进行传输,使系统高速传输能力大大加强,并且功耗低,抗干扰能力强。研究结果表明,该设计具有较好的稳定性、灵活性和通用性等,并已成功运用于某40通道高速CCD成像系统中,系统并行处理和传输的总数据率高达7.68Gbit/s。展开更多
Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment te...Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment temperature, the a phase solid grain size of processedMg-Al-Zn alloy by ECAE increases firstly due to coarsening of a phase solid grains, then decreasesdue to melting of a phase solid grains. With the increase of extrusion passes during ECAE, the aphase solid grain size in the following semi-solid isothermal treatment decreases. The a phase solidgrain size of processed Mg-Al-Zn alloy by ECAE under route B_C is the smallest, while the a phasesolid grain size of processed material by ECAE under route A is the largest. The primary mechanismof spheroid formation depends on the melting of recrystallizing boundaries and diffusion of soluteatoms in the semi-solid state.展开更多
文摘针对航天光学遥感成像系统输出通道多、输出速率高的特点,提出一种高速、多通道CCD图像数据并行处理与传输系统的设计方案。该方案以FPGA为数据处理和控制核心,采用基于FPGA区域并行处理的数据处理方法,运用FPGA内部块RAM构建高速多通道CCD图像的缓冲区,在存取控制上采取区域缓存和时分复用的策略完成对高速多通道CCD图像数据的实时处理;而对高速多通道CCD图像数据的传输采用基于Channel link高速差分串行传输技术,以高速差分串行的LVDS(Low Voltage Differential Signal)数据流替代传统的并行"TTL/COMS"信号进行传输,使系统高速传输能力大大加强,并且功耗低,抗干扰能力强。研究结果表明,该设计具有较好的稳定性、灵活性和通用性等,并已成功运用于某40通道高速CCD成像系统中,系统并行处理和传输的总数据率高达7.68Gbit/s。
基金Projects(50475029,50605015) supported by the National Natural Science Foundation of China
文摘Microstructure evolution of processed Mg-Al-Zn alloy by equal channel angularextrusion(ECAE) in semi-solid isothermal treatment was investigated. The results show that withincreasing semi-solid isothermal treatment temperature, the a phase solid grain size of processedMg-Al-Zn alloy by ECAE increases firstly due to coarsening of a phase solid grains, then decreasesdue to melting of a phase solid grains. With the increase of extrusion passes during ECAE, the aphase solid grain size in the following semi-solid isothermal treatment decreases. The a phase solidgrain size of processed Mg-Al-Zn alloy by ECAE under route B_C is the smallest, while the a phasesolid grain size of processed material by ECAE under route A is the largest. The primary mechanismof spheroid formation depends on the melting of recrystallizing boundaries and diffusion of soluteatoms in the semi-solid state.
