基于SIMD处理器的全定制多粒度矩阵寄存器文件

在SIMD处理器上映射矩阵运算时会带来大量的数据重排操作从而降低系统性能。本文提出定制化的多粒度矩阵寄存器文件(MMRF)以消除数据重排操作。MMRF支持多粒度的并行行访问和列访问,从而提升矩阵运算的性能。MMRF可以被动态配置为不同的并行访问模式,在不同模式下一个或多个子矩阵可以被并行处理。实验结果显示,同传统的向量寄存器文件(VRF)和矩阵寄存器文件(MRF)相比,MMRF可分别带来2.21倍和1.6倍的平均性能提升,面积分别增加14.3%和3.7%,功耗分别增加14.6%和2.2%。同TMS320C64x+处理器相比,基于SIMD技术的FT-Matrix处理器在引入MMRF后可以得到5.65倍到7.71倍的性能提升。通过层次化的全定制设计技术,MMRF的面积和关键路径分别减少17.9%和39.1%。     

美国海军水面舰艇导弹防空体系分析

分析了美国海军防空作战思想,在此前提下总结出美海军舰空导弹体系主要的作战任务,说明了美海军典型水面舰艇装备舰空导弹的情况,最后阐述了今后美舰空导弹的发展趋势。     

改进的累量域波达方向矩阵法

构造了一种可以进行高分辨二维波达方向估计的累量域波达方向矩阵。利用该矩阵的特征值和特征向量 ,就可以求出信号源的方位角和俯仰角。同其它的波达方向矩阵法相比 ,放宽了对阵列结构的要求 ,提高了阵列孔径的利用率。同时 ,由于采用了累量来构造波达方向矩阵 ,因此新方法具有对高斯噪声的自然盲性。     

视频综合控制台设计

本文对于带宽为１２０ＭＨｚ、显示器同步跟踪范围１５ＫＨｚ—６６ＫＨｚ的８×４视频综合控制台的主要技术指标和电路实现方法进行了详细地论证。控制台已研制,并投入使用。     

美军2010年联合作战构想

详细阐述了美军２０１０年联合作战构想的内容,应重视主宰机动、精确打击、全维保护、集中后勤等４个作战概念。     

Influence of propagation direction on operation performance of rotating detonation combustor with turbine guide vane

Due to the pressure gain combustion characteristics, the rotating detonation combustor (RDC) can enhance thermodynamic cycle efficiency. Therefore, the performance of gas-turbine engine can be further improved with this combustion technology. In the present study, the RDC operation performance with a turbine guide vane (TGV) is experimentally investigated. Hydrogen and air are used as propellants while hydrogen and air mass flow rate are about 16.1 g/s and 500 g/s and the equivalence ratio is about 1.0. A pre-detonator is used to ignite the mixture. High-frequency dynamic pressure transducers and silicon pressure sensors are employed to measure pressure oscillations and static pressure in the combustion chamber. The experimental results show that the steady propagation of rotating detonation wave (RDW) is observed in the combustion chamber and the mean propagation velocity is above 1650 m/s, reaching over 84% of theoretical Chapman-Jouguet detonation velocity. Clockwise and counterclockwise propagation directions of RDW are obtained. For clockwise propagation direction, the static pressure is about 15% higher in the combustor compared with counterclockwise propagation direction, but the RDW dominant frequency is lower. When the oblique shock wave propagates across the TGV, the pressure oscillations reduces significantly. In addition, as the detonation products flow through the TGV, the static pressure drops up to 32% and 43% for clockwise and counterclockwise propagation process respectively.