平流层飞艇空间控制作战样式分析*

临近空间是未来作战的制高点之一,在分析了临近空间作战特点的基础上,建立了平流层飞艇编队作战模型,通过研究飞艇的信息对抗能力、防御能力及武器性能,表明激光武器比导弹更适合于平流层飞艇的临近空间作战,干扰通信系统比干扰侦察系统对作战结果的影响更大,采取一定的防御措施也不能对平流层飞艇的损失率产生较大影响.     

油料洞库油气爆炸抑制数值模拟

根据受限空间油气爆炸及抑爆过程的发展规律和机理以及爆炸燃烧和抑爆的特点,建立了基于分步反应控制机理的爆炸燃烧及抑爆模型,解决了爆炸及抑爆发展过程中火焰和压力波相互耦合机制,克服了化学反应与多相流动耦合时计算和存储方面的困难,缓解了控制方程求解时的"刚性",数值仿真结果与实验吻合较好。研究显示,火焰在传播过程中,由于受到湍流和气体流动影响,形状不断发生变化,不是一直加速传播的,而是呈一定波动范围加速传播的;在狭长受限空间内,油气混合物的爆炸压力和火焰速度会大幅升高,不加以抑制将导致严重的破坏后果;在抑爆区由于抑爆剂强烈的物理、化学抑制作用以及两相间进行的能量和动量交换,充满抑爆区的抑爆剂云(雾)能很好地阻断爆炸燃烧火焰的持续传播,从而使爆炸压力失去油气持续燃烧所提供能量的补充而迅速衰减,爆炸传播迅速得到抑制。     

基于雷达波束篱笆的空间碎片数量的置信区间估计

针对雷达波束篱笆空间碎片探测模式,提出了一种估计碎片数量置信区间的方法.对于给定的轨道高度范围,将轨道倾角和雷达散射截面足够大的碎片是否真正穿越波束篱笆这一事件用(0-1)分布来建模,根据所获取的轨道高度数据,得到该轨道高度范围内碎片穿越波束篱笆的平均概率,进而采用中心极限定理估计出该范围内碎片总数量的置信区间.仿真实验验证了方法的有效性.     

基于重要性采样的空时分组码快速仿真系统设计

高效的仿真技术对研究提高军事通信的性能具有重要意义。针对传统的蒙特卡罗仿真时间长的问题,提出了基于重要性采样的空时分组码高效仿真方法,给出了仿真模型和实现流程。仿真和分析结果表明本方法在运行较少的时间内能够获得较好的误码性能。采用该高效仿真方法可以加快军事通信技术研究的进程。     

India’s emerging space assets and nuclear-weapons capabilities

ABSTRACT

Over the last five decades, India’s nuclear and space programs have gone through several phases, from collaboration to divorce to supportive. An interplay of two factors determined the nature of the relationship. One was the state of India’s nuclear-weapon program. The second was international conditions, especially India’s relationship with the nuclear-nonproliferation regime. In the early decades, because of the rudimentary nature of India’s nuclear and space programs, the relationship was collaborative, since the rocket technology being developed was a necessary adjunct to the nuclear-weapon program. Subsequently, as India’s rocketry capabilities and nuclear-weapon program began to mature and concerns about international sanctions under the non-proliferation regime began to grow, the two programs were separated. The Indian rocketry program was also divided, with the civilian-space and ballistic-missile programs clearly demarcated. After India declared itself a nuclear-weapon state in 1998 and the programs matured, the relationship has become more supportive. As the two programs mature further, this relationship is likely to deepen, as the nuclear-weapon program requires space assets to build a robust and survivable nuclear deterrent force.