一种基于ECEF坐标转换的最小二乘配准算法

提出了一种有效的多雷达配准算法。该算法采用ECEF(earth -centeredearth -fixed)坐标系作为过渡坐标系 ,将分散配置的各雷达站的量测数据实时转换到主站 (设主站雷达无系统偏差 ) ,利用各站同主站之间的量测差值 ,采用最小二乘法实时估计出各站相对主站之间的系统偏差 ,从而对网中各雷达进行配准。计算机仿真结果证明了该算法的正确性和有效性。     

基于Pro/E装配模型的汽车油气管检具设计

介绍汽车油气管检具的CAD／CAM集成解决方案，详细介绍Pro／E装配模型部件标识机制及坐标转换理论，最终得到检具的检测坐标．     

实时条件下多车辆路径与调度

研究实时条件下的多车辆路径与调度问题，重点研究了多种费用，包括车辆空驶费用、任务延迟费用和任务拒绝费用下的问题模型及求解。给出了问题的数学描述，并对其静态问题，构造了一个混合整数规划模型。随后提出了两种滚动时域求解策略。最后通过仿真实例，对几种策略的性能进行了对比。     

基于GA的HFSP调度中的工位竞争问题研究

系统分析了工位竞争现象产生的背景环境,及其影响;同时详细论述了拆分竞争作业群的顺序,所需寄存空间,关键参数控制等;接着先划分出竞争作业群的分布类别,在此基础上逐一分析了各类别重叠垫的拆分方法,由此总结出算法。最后给出一个实例,利用该算法经mat lab运行得出了较为理想的结果。     

Hybrid particle swarm optimization for solving resource-constrained FMS

In this paper,an approach for resource-constrained flexible manufacturing system(FMS)scheduling was proposed,which is based on the particle swarm optimization(PSO)algorithm and simulated annealing(SA)algorithm.First,the formulation for resource-con-strained FMS scheduling problem was introduced and cost function for this problem was obtained.Then.a hybrid algorithm of PSO and SA was employed to obtain optimal solution.The simulated results show that the approach can dislodge a state from a local min-imum and guide it to the global minimum.     

双基球扁发射药生产线的改进遗传排产算法研究

针对传统遗传算法在解决批次生产问题中存在的"早熟收敛"以及"局部搜索能力差"等问题,设计了基于预处理技术的改进遗传算法,实现对批次生产过程的处理.采用随机数法、定则生成法和块基因插补法三种方法,按照合适的比例,进行种群的初始化,在保证初始化种群多样性同时提高其个体质量;通过精英保留策略和锦标赛选择策略进行选择操作,实现优质种群个体的选择;运用专家打分法对产品进行优先级排序;采用基于位置和优先级相结合的方法选择交叉位点,进行交叉操作,保留父代优良基因,避免"早熟收敛";采用邻域重组策略进行变异操作,保证优质解种群的产生和质量解的继承.以最大化最小交货提前期为目标函数,实现排产算法研究.最后,以双基球扁发射药生产线为例,实现了改进遗传算法排产过程,大大提高公司的接单预估效率和产线的生产组织效率,然后运用单一随机初始化种群法和混合初始种群法进行比较分析,证明了改进算法的优越性.     

一种极小化∑wjCj的分批排序问题的算法

讨论了单机分批排序问题中目标是极小化加权总完工时间的问题．对于所有工件的加工时间都相等的情况，分别对常数个到达时间和任意个到达时间的情况给出了两个最优算法，并给出了其算法复杂性．     

基于调度效益最大化的多功能组网认知雷达资源优化调度算法

在组网认知雷达中,针对多目标多任务(如搜索、跟踪与成像等)按优先级进行资源调度时易造成目标任务丢失的问题,提出基于调度效益最大化的多功能组网认知雷达资源优化调度算法。该算法将搜索与跟踪任务的时间窗考虑到目标函数中,通过目标任务的重要性(优先级)和有效性(时间窗)两个因素的加权来表示雷达对目标任务的调度效益,根据调度效益最大准则建立并利用遗传算法求解资源调度模型。对仿真结果分析表明,该方法能够提高组网认知雷达的整体效能。     

Chinese geodetic coordinate system 2000

The basic strategies in establishing the Chinese geodetic coordinate system 2000 have been summarized, including the definition of the coordinate system, the structure of the terrestrial reference frame, the functional and stochastic models involved in the realization of the reference frame as well as the improvements of the adjustment procedures. First, the fundamental frame of the coordinate system is composed of the permanent GPS tracking network in China which is integrated into the international GPS service stations by combined adjustment, in order to guarantee the consistence between the international terrestrial reference system and the Chinese geodetic coordinate system. Second, the extended frame of the coordinate system is composed of the unified 2000＇ national GPS network which is integrated by 6 nationwide GPS networks with more than 2500 stations under the controlling of the fundamental frame. Third, the densified frame is composed of national astronomical geodetic network with nearly 50 thousand stations which was updated by the combined adjustment with the 2000＇ national GPS network, thus the datum of the national astronomical geodetic network has been unified and the precision greatly improved. By the optimal data fusion method the influences of the datum errors, systematic errors and the outliers in the separated geodetic networks are weakened in the unified Chinese geodetic coordinate frame. The significance in application of the new geodetic coordinate system and the existing problems in the reference frame are described and analyzed.     

数字电路的过渡干扰及其抑制方法

本文在分析数字电路过渡干扰的种类及其产生原因的基础上,分别介绍了由于信号延迟引起的过渡干扰和信号输入时间先后不同引起的过渡干扰的抑制方法。