基于ICSA-MWF的多级投影干扰抑制方法

为降低子空间投影方法的计算量，提出基于迭代相关相减结构多级维纳滤波器(iterative correlation subtraction algorithm-multistage Wiener filter，ICSA-MWF)的无源雷达多级投影干扰抑制方法。该方法根据回波通道内多径干扰的特点，首先提出一种新的初始化方法将ICSA-MWF应用于距离-多普勒频移域内，依据其前向投影特性即可利用多级小维数投影取代子空间投影方法,接着又提出一种简便的滤波器级数选取方法,然后利用迭代算法实现后向误差综合，最终输出误差即为多径干扰抑制后的信号。该方法干扰抑制性能好、数值稳健且计算量低于子空间投影方法。仿真结果表明该方法的有效性。     

Polyphase coded signal design for MIMO radar using MO-MicPSO

A novel modified optimization technique known as the multi-objective micro particle swarm optimization(MO-MicPSO) is proposed for polyphase coded signal design.The proposed MO-MicPSO requires only a small population size compared with the standard particle swarm optimization that uses a larger population size.This new method is guided by an elite archive to finish the multi-objective optimization.The orthogonal polyphase coded signal(OPCS) can fundamentally improve the multiple input multiple output(MIMO) radar system performance,with which the radar system has high resolution and abundant signal channels.Simulation results on the polyphase coded signal design show that the MO-MicPSO can perform quite well for this high-dimensional multi-objective optimized problem.Compared with particle swarm optimization or genetic algorithm,the proposed MO-MicPSO has a better optimized efficiency and less time consumption.     

Adaptive detector design of MIMO radar with unknown covariance matrix

The problem of detecting signal with multiple input multiple output (MIMO) radar in correlated Gaussian clutter dominated scenario with unknown covariance matrix is dealt with. The general MIMO model, with widely separated sub-arrays and co-located antennas at each sub-array, is adopted. Firstly, the generalized likelihood ratio test (GLRT) with known covariance matrix is obtained, and then the Rao and Wald detectors are devised, which have proved that the Rao and Wald test coincide with GLRT detector.To make the detectors fully adaptive, the secondary data with signal-free will be collected to estimate the covariance. The performance of the proposed detector is analyzed, however, it is just ancillary. A thorough performance assessment by several numerical examples is also given, which has considered the sense with co-located antennas configure of transmitters and receivers array.The results show that the performance the proposed adaptive detector is better than LJ-GLRT, and the loss can be acceptable in comparison to their non-adaptive counterparts.     

圆形坑道各向异性稳定渗流的一个解析解

针对层状分布土体中的坑道渗流，建立一个均质、各向异性稳定渗流的数学模型，采用坐标变换法，推出等效潜水层中圆形断面水平坑道二维稳定渗流场的流量、水头及流函数公式，定义ε为参数系数各向异性率，以表达含水层在各渗流主轴方向上渗透性的差别，量纲为1化算例证明了该解析解的正确性。     

石灰桩复合地基固结分析

在分析石灰桩成桩过程的基础上 ,给出了基于弹性理论的石灰桩膨胀桩径计算公式 .根据解析理论对石灰桩复合地基的固结进行了分析 ,并得出一些有益的结论     

基于MN-MEA算法的无人机载SAR相位误差补偿处理

无人机载合成孔径雷达(synthetic aperture radar, SAR),在成像中更容易受到运动误差的干扰,造成图像质量下降。利用三维空间坐标系的斜距方程分离,可以为无人机载SAR成像提供更多的信息，但该方法并未考虑无人机载SAR成像中的运动误差补偿问题。针对无人机载机动SAR成像的相位误差补偿问题,进行相关研究。结合子图像划分,提出了基于迭代分块处理和误差相位初值模型的改进牛顿最小熵(modified Newton minimum entropy, MN-MEA)相位误差补偿算法,进一步校正了残余空变性误差和运动误差,改善成像质量。     

地质雷达的探测实践

介绍了地质雷达的特点和探测解释方法，基于对各种地质条件下不同的探测目标而采用不同的解释方法，论述了地质雷达的实用性和在工程施工中的作用。     

机载雷达天线夹层结构的等效分析

为便于机载雷达天线的动力学分析，由夹层结构的力学特性，提出了用单层结构等效夹层结构的方法，该不仅可用于夹层结构的动力学分析，而且可用于工程中类似结构。     

具临界非线性项的随机非线性Schrdinger方程的整体解

在二维空间中,讨论带调和势且具临界非线性项的一类随机非线性Schrdinger方程的Cauchy问题,在能量空间中研究其解整体存在的充分条件.借助于随机分析及偏微分方程的基本理论,利用It幃公式、鞅不等式和Gagliardo-Nirenberg不等式,通过估计能量泛函的期望得到在初值充分小时,Cauchy问题的解是整体存在的.     

水泥搅拌桩施工在软土地基处理中的应用

结合工程实例,介绍水泥搅拌桩在软土地基处理中的应用。广州亚运城市政工程项目,属珠江三角洲冲积平面地貌,场区内水网及水塘分布密集,主要为淤泥地质,为保证道路工程地基处理的施工质量,在水泥搅拌桩处理的技术要求等方面采取了有效的措施。