一种收发互易的频带合成STAP-GMTI系统架构

信号带宽及采样频率的降低有利于基于微系统实现天线阵面的轻薄化,提升超高速平台大口径天线的适装性,然而地面运动目标的精确跟踪和识别对地面运动目标的高分辨距离像提出了需求.针对该矛盾,提出了一种基于收发互易的低瞬时带宽阵列,通过频带合成实现高分辨率地面运动目标显示的系统架构及处理方法.阵列的收发互易实现了等效相位中心的重合...     

Method to suppress moving targets in SAR images

In the high-resolution wide-swath (HRWS) SAR system, the moving targets are usually smeared and imaged at incorrect positions in the resulting SAR image by utilizing the traditional stationary scene imaging processing. Moreover, these defocused moving targets may cover the stationary scene. The number of spatial degrees of freedom required for suppressing moving targets by the traditional space-time adaptive processing framework is equal to the number of the moving targets in the SAR scene multiplied by the PRF undersampling number. This requirement is hard to meet in practice. In order to overcome the above problem, a new space-time adaptive processing framework based on azimuth Deramp processing is proposed in this paper. Firstly, the moving targets are coarsely focused in the space-time plane through the azimuth Deramp processing. In this case, only one spatial degree of freedom is needed for suppressing one moving target. If there are multiple targets, it can effectively reduce the required degrees of freedom by utilizing the dynamic steering vector concept. Last, simulation results are provided to show the validity of the proposed method.     

Job-shop Scheduling问题的研究

本文研究了Job-Shop类型矛性制造系统的调度问题，建立了数学模型，并用遗传算法进行求解。实践表明，该算法具有较好的实用性和可行性。     

数据传输链路中几种纠错编译码的算法和性能

介绍数据传输中常用的戈莱码的几种不同译码算法，分析各种算法的纠错性能，给出用计算机模拟的结果。还介绍对数据链Ｌｉｎｋｌ中的纠错码和地址码的编译码算法，分析其性能，给出计算机模拟的结果。     

新型增塑剂二甘醇二苯甲酸酯的研究

给出了二甘醇二苯甲酸酯 ( DEDB)的生产工艺流程 ,工艺条件和消耗定额。最适宜反应条件如下 :二甘醇1 mol;苯甲酸 2 .1 mol;H2 SO2 2 g;反应时间 4 h;反应温度 1 30～ 1 50℃ ;按二甘醇计算收率达 94 %以上     

低电阻率油层解释方法

储层岩性变化形成的低电阻率油层是测井解释的一大难题，因为它的电阻率接近或低于临近的水层，使解释常常出现失误，它的成因主要是储层岩石颗粒的相对变细和泥质含量的相对增高，导致束缚水饱和度增加，在沉积单元上，一般出现在河流相砂体的顶部，三角液水下分流河道的天然堤和三角洲前缘末端的朵状砂体等部位；在物性上表现为高孔隙度和低渗透率，在电性上表现为高时差，低电阻率和高自然伽马，解释时给出了时差曲线与孔隙度，渗透率关系的模型，即岩石颗粒愈细，时差值越高，含油饱和度的计算采用修正后的阿尔奇公式，所提方法对于正确认识储层，提高解释符合率有一定的指导意义。     

自然通风的应用与研究

合理利用自然通风对改善室内空气品质及建筑节能有重要意义。介绍了自然通风应用与研究的几个主要方面及其研究现状，并指出了对其进一步开展研究的方向。     

Investigation of moisture condensation on papermaking plant envelopes in high humidity environment by orthogonal analysis and CFD simulation

The objective of this study is to investigate the problem of moisture condensation on papermaking plant envelopes in high humidity environment. In this study, orthogonal experiment method is combined with CFD simulation to explore how moisture condensation varies with governing factors, such as the thermal parameters of building envelopes, temperature and humidity distributions or ventilation and air distribution. The criteria used by our work to determine whether the condensation will occur on envelopes are to calculate the temperature differences between the inner surface and the air dew point near the envelopes. Specifically, the temperature differences have a linear relationship with the governing parameters, and a first-order linear regression equation is derived, which is validated by data from investigation and measurement. This research provides theoretical support and measurement data for solutions of the envelope condensation problems and anti-condensation design of HVAC systems in papermaking plants.     

一种高精度的ISAR转动补偿和方位定标方法

传统逆合成孔径雷达(ISAR)成像算法忽略了目标回波的高阶转动相位的影响,导致方位向聚焦效果较差,且无法直接从目标图像中获取目标尺寸信息。该文提出一种转动补偿和方位定标方法。该方法采用回波的全部方位信息,通过构造局部平均多普勒趋势(LADT)信号获取目标回波的多普勒变化趋势。进一步利用随机采样一致(RANSAC)算法估计多普勒调频率及目标有效转动速度,实现高精度转动补偿与方位定标。仿真与实测数据实验验证了该方法的有效性。     

电动汽车锂离子电池的生热特性

为研究锂离子电池的热特性,以3 200 mA·h、3.67 V圆柱形三元材料锂电池为研究对象,进行了不同温度、不同充/放电倍率的热特性试验和低温加热试验.试验结果表明：随着充/放电电流的增大以及环境温度的降低,电池温度快速升高,低温下加热可以提高锂离子电池的充/放电性能.