一类非平稳随机过程未来变化趋势的多步实时预报

本文在回避建立过程加速度模型这一传统方法的前提下，提出了一类非平衡随机过程未来变化趋势的多步实时预报模型，并对高斯白噪声背景下过程变化的共性进行了研究。文中给出了算例与仿真计算结果。     

Random signal radar - a winner in both the military and civilian operating environments

Besides some general requirements, modern military radars should possess excellent LPI (low probability of intercept) properties. And civilian radars should satisfy the rigorous requirement of EMC (electro-magnetic compatibility) performance. The special features of random signal radar are analyzed here based on the different requirements for military and civilian use. Results show that random signal radar has excellent LPI property and EMC performance simultaneously, which can satisfy both military and civilian requirements.     

RB—SiC高致密、超光滑SiC表面改性涂层的制备

为了获得高质量光学表面的碳化硅反射镜,利用射频磁控溅射方法,在直径80mm的RB—SiC基片上沉积了厚约60μm的SiC致密改性涂层,使用传统机械抛光方法对改性层进行超光滑加工,并测试了改性前后的表面粗糙度。结果表明,抛光后SiC表面改性RB—SiC反射镜表面粗糙度均方根（rms）值达到了0．316nm。获得了具有较高...     

基于鲁棒H∞滤波的追踪卫星相对导航算法研究

针对追踪卫星存在轨道机动的情况,在模型存在不确定参数和非高斯噪声输入时,研究了基于鲁棒H∞滤波理论的相对导航算法.该算法采用线性不等式技术,根据Lyapunov稳定性原理推导出具有范数有界不确定参数离散系统的鲁棒H∞滤波器存在的充要条件,并将滤波器的设计转化为一个凸优化的求解问题.将该算法应用到追踪卫星导航中,仿真结果表明该算法在大轨道机动下有效且能消除模型不确定性和非高斯噪声对系统造成的不利影响.     

基于简化RLS算法的无源雷达杂波抑制

研究了利用调频广播信号作为非合作目标照射源的收发分置无源雷达系统的运动目标检测方法。针对直达波、多径信号对目标检测性能的影响,选择自适应滤波方法抵消杂波。LMS算法计算复杂度低,但收敛速度慢;相反RLS算法收敛速度快,但计算复杂度高。综合两者优点,提出了一种简化RLS算法:复数两级欧几里德坐标下降算法(CDCD)。基于实测数据的处理结果表明:与同量级复杂度的LMS和FEDS相比,该算法具有更好的收敛速度。最后通过对杂波相消后的主天线信号与参考信号相干匹配实现目标检测。     

基于参考航迹的地面测控站站址规划算法研究

当使用地面测控站接力手段对飞航式导弹进行测控时,就存在测控站的布站问题。结合地理信息系统GIS,建立一种基于参考航迹的测控站站址规划算法,可以为布站规划提供有效的计算机辅助手段。     

Tracking characteristics of tracer particles for PIV measurements in supersonic flows

The tracking characteristics of tracer particles for particle image velocimetry (PIV) mea-surements in supersonic flows were investigated. The experimental tests were conducted at Mach number 4 in Multi-Mach Wind Tunnel (MMWT) of Shanghai Jiao Tong University. The motion of tracer particles carried by the supersonic flow across shockwaves was theoretically modelled, and then their aerodynamic characteristics with compressibility and rarefaction effects were evalu-ated. According to the proposed selection criterion of tracer particles, the PIV measured results clearly identified that the shockwave amplitude is in good agreement with theory and Schlieren visu-alizations. For the tracer particles in nanoscales, their effective aerodynamic sizes in the diagnostic zone can be faithfully estimated to characterize the tracking capability and dispersity performance based on their relaxation motion across oblique shockwaves. On the other hand, the seeding system enabled the tracer particles well-controlled and repeatable dispersity against the storage and humidity.     

Development of random signal radars

Development of random signal radar (RSR) over the past 30 years is described. Conventional methods of implementing RSR are summarized such as correlation, spectrum analysis, and anticorrelation. Some typical RSR systems are introduced, for example, noise frequency modulation CW radar, random binary phase-coded CW radar, etc., and their merits and demerits are also pointed out. Finally, RSR development trends are analyzed     

从构建长效机制的维度对高校思想政治理论课教学改革的思考

高校思想政治理论课是高校思想政治教育的主渠道、主阵地,如何增强高校思想政治理论课教育的实效性、长效性已成为高校思想政治教育研究的重要课题.论文认为,着眼于长效机制的构建,必须建立领导重视的保证制度,树立以人为本的教学理念,拥有稳定而高素质的人力资源,积极推进课程建设与教学创新.     

Joint TNT and RDX detection via quadrupole resonance

Quadrupole resonance (QR) technology has been receiving increasing attention for explosive detection in applications including landmine detection. It can be used as a confirming sensor for buried plastic landmine detection by detecting the explosives within the mine. Since a single mine can contain more than one type of explosives (e.g., trinitrotoluene (TNT) and (RDX) compound), a detector designed to detect only one type of explosive may not provide the best detection. We focus herein on the joint detection of TNT and RDX explosives for the landmine detection via the QR sensor. To mitigate the RF interferences (RFIs) associated with the QR measurements, we apply a doubly constrained robust Capon beamformer (DCRCB) to perform the spatial beamforming by exploiting the spatial correlation of the RFIs. Based on the output of the spatial DCRCB, we devise a generalized likelihood ratio test (GLRT) for the joint TNT/RDX detection, which is referred to as the DCRCB-GLRT detector. We show that our detector has the constant false alarm rate (CFAR) property and that the detection variable obeys a x² -mixture distribution in the mine-free scenario. The effectiveness of the proposed DCRCB-GLRT detector is demonstrated with the experimental data collected by Quantum Magnetics, Inc.