机载AIS监视性能仿真研究

针对机载AIS由于时隙冲突导致的监视性能下降的问题,提出通过分区域接收提高检测概率的方法.通过分析AIS系统的接入过程,深入研究影响系统监视性能的因素,利用MATLAB,基于SOTDMA协议构建全新结构下的机载AIS系统的仿真模型.仿真结果确定了时隙冲突、系统容量和负载之间的关系,表明分区域接收能有效提高检测概率,从而为工程应用提供了有益的参考.     

用于海洋浮标的多串口数据采集系统设计

针对海洋浮标的布放环境和使用情况,本文介绍了一种用于海洋浮标的多串口数据采集系统,能够满足多种类型海洋浮标的应用需求.     

只收不发--AIS技术在舰船上的应用

在分析和讨论了通导设备AIS的发射技术的基础上,分别就时分多址、时域和频域层面说明信道的有限性和电磁辐射特性。然后针对船舶终端的只收不发的需求,提出三个解决方案。     

浮标-缆-物体综合系统动力学二维时域分析

本文介绍由表面浮标、缆和中间物体组成的综合海洋缆系统力学特性的二维时域分析方法。建立了系统各组成部分运动数学模型,计及非线性水动力和缆的非线性特性,并给出了计算实例。     

Traffic simulation based ship collision probability modeling

Maritime traffic poses various risks in terms of human, environmental and economic loss. In a risk analysis of ship collisions, it is important to get a reasonable estimate for the probability of such accidents and the consequences they lead to. In this paper, a method is proposed to assess the probability of vessels colliding with each other. The method is capable of determining the expected number of accidents, the locations where and the time when they are most likely to occur, while providing input for models concerned with the expected consequences. At the basis of the collision detection algorithm lays an extensive time domain micro-simulation of vessel traffic in the given area. The Monte Carlo simulation technique is applied to obtain a meaningful prediction of the relevant factors of the collision events. Data obtained through the Automatic Identification System is analyzed in detail to obtain realistic input data for the traffic simulation: traffic routes, the number of vessels on each route, the ship departure times, main dimensions and sailing speed. The results obtained by the proposed method for the studied case of the Gulf of Finland are presented, showing reasonable agreement with registered accident and near-miss data.     

TELSEIS采集站CPU板EEPROM错误代码处理方法

介绍两种处理TELSEIS采集站CPU板EEPROM错误代码方法，一种是利用美国FII公司提供的维修站的专用设备，另一种是采用简单自制EEPROM读写装置和普通微机。     

Artificial immune system for optimal design of composite hydrogen storage vessel

Based on the clonal selection principle in the biological immunology, an artificial immune system (AIS) is proposed to optimize the weight of Al-carbon fiber/epoxy composite hydrogen storage vessels under burst pressure constraint. The AIS simulates the generation of the antigens, the combination of the antigens and antibodies, and the selection, cloning and hypermutation of B cells, the maintenance of diverse antibody cells, the generation of the memory cells with high affinities and the death of the antibody cells with low affinities. Effects of the antibody size and the iterative number on the optimization results are explored. By comparison, the AIS shows higher search velocity and precision than the genetic algorithm and simulated annealing.     

基于Bootstrap 法的机载浮标搜潜系统作战效能指标分析

为解决试验样本量较少导致评估精度较低的问题,引入Bootstrap方法对机载浮标搜潜系统部分指标进行评估。介绍对于成败型指标的目标发现率评估步骤,并对一定环境下的潜艇目标发现率、浮标信号有效接收距离和某分机灵敏度这3项有代表性的指标进行仿真。分析结果说明该方法确实能够提高评估精度。     

钢铁材质浮标对ADCP水文监测系统流量测验精度的影响

针对钢铁材质浮标的ADCP水文监测系统内置罗经受船磁力影响,导致流向测验出现偏差的问题,通过2009—2011年徐六泾水文站定线比测大、中潮水文测验的实测资料,分析采用垂直于断面的方位角作为流向(流向不修正)和采用断面各垂线实测平均流向作为流向(流向修正)两种情况下钢铁材质浮标对ADCP水文监测系统流量测验精度和流量、潮量计算的影响。结果表明:无论是否修正流向,计算得到涨落潮流量、潮量以及全潮下泄潮量和走航式ADCP定线比测的实测资料相比,误差均较小,精度都很高;在流量和潮量计算时,可以对钢铁材质浮标ADCP流向不做修正。