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Web-based nautical charts automated compilation from open hydrospatial data 基于web的海图自动编译从开放的水文空间数据
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-06-27 DOI: 10.1017/S0373463322000327
Stilianos Contarinis, B. Nakos, L. Tsoulos, Athanasios Palikaris
Abstract Electronic navigational charts (ENCs) are specialised geospatial datasets, issued by or on the authority of a government or hydrographic office, in accordance with the International Hydrographic Organisation's (IHO) standards, specifications and symbol sets. The datasets generally comprise encoded information collected from hydrographic surveys, aimed primarily at the safety of navigation. Most ENCs are not openly available, since the encrypted datasets can be acquired through various license schemes via a centralised distribution network coordinated by two organisations operating on behalf of the coastal states that produce them. This paper describes a methodology and an integrated system developed at the National Technical University of Athens Cartography Laboratory for the generation of web-based nautical charts utilising open data and free software. The system compiles nautical charts compliant with IHO's S-101 latest standard; using open hydrospatial data retrieved from marine spatial data infrastructures (MSDI) and other qualified volunteered geographic information (VGI) sources. Open-source geospatial libraries and web-map vector technologies are used to build the system components and software scripts developed to enable automated compilation. The study also discusses how the system can be improved further by leveraging web services for end-to-end process automation and satellite-derived bathymetry for accurate depiction of seabed topography in low-depth areas.
摘要电子导航图(ENC)是由政府或水文办公室根据国际水文组织(IHO)的标准、规范和符号集发布或授权发布的专业地理空间数据集。数据集通常包括从水文调查中收集的编码信息,主要针对航行安全。大多数ENC都不是公开可用的,因为加密数据集可以通过各种许可证计划,通过由代表生产这些数据集的沿海国家的两个组织协调的集中分发网络获得。本文介绍了雅典国立技术大学制图实验室开发的一种方法和一个集成系统,用于利用开放数据和免费软件生成基于网络的海图。该系统编制符合IHO s-101最新标准的海图;使用从海洋空间数据基础设施(MSDI)和其他合格的自愿地理信息(VGI)来源检索的开放水文空间数据。开放源码地理空间库和网络地图矢量技术用于构建系统组件和开发的软件脚本,以实现自动化编译。该研究还讨论了如何通过利用网络服务实现端到端过程自动化和卫星测深来准确描述低深度地区的海底地形,从而进一步改进该系统。
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引用次数: 3
Rapid star identification algorithm for fish-eye camera based on PPP/INS assistance 基于PPP/INS辅助的鱼眼相机快速星识别算法
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-06-13 DOI: 10.1017/S0373463322000285
Chonghui Li, Yuanxi Yang, Guorui Xiao, Zhanglei Chen, Shuai Tong, Zihao Liu
Abstract The fish-eye star sensor with a field of view (FOV) of 180° is an important piece of equipment for attitude determination, which improves the visibility of stars significantly. However, it also brings the star identification (star-ID) difficulties because of imprecise calibrations. Thus, a fish-eye star-ID algorithm supported by the integration of the precise point positioning/inertial navigation system (PPP/INS) is proposed. At first, a reference star map is generated in combination with the distortion model of the fish-eye camera based on the position and attitude information from the PPP/INS. Then the star points are extracted in a specific neighbourhood of the reference star points. Subsequently, the extracted star points are individually tested and identified according to angular distance error. Finally, the real-time precise attitude is determined based on the star-ID results. Experimental results show that, 270–310 stars can be identified in a fish-eye star map with an average time of 0.03 s if the initial attitude error is smaller than 1.5° and an attitude determination accuracy better than 10″ can be achieved by support from PPP/INS.
摘要180°视场鱼眼星敏感器是一种重要的姿态确定设备,能显著提高恒星的可见性。然而,由于标定精度不高,也给星识别带来了困难。为此,提出了一种结合精确点定位/惯性导航系统(PPP/INS)的鱼眼星识别算法。首先,根据PPP/INS的位置和姿态信息,结合鱼眼相机的畸变模型生成参考星图;然后在参考星点的特定邻域中提取星点。然后,根据角距误差对提取的星点进行单独测试和识别。最后,根据星id结果确定实时精确姿态。实验结果表明,当初始姿态误差小于1.5°时,在鱼眼星图中识别270 ~ 310颗恒星的平均时间为0.03 s,在PPP/INS的支持下,姿态确定精度优于10″。
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引用次数: 1
A fast and accurate transfer alignment method without relying on the empirical model of angular deformation 一种不依赖于角变形经验模型的快速准确传递对准方法
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-06-01 DOI: 10.1017/S0373463322000261
Jie Yang, Xinlong Wang, Xiaokun Ding, Qing Wei, Liangliang Shen
Abstract This paper, in allusion to the limitations of traditional transfer alignment methods based on the external measurement equipment or the empirical model of angular deformation, proposes a rapid and accurate transfer alignment method without relying on the empirical angular deformation model. Firstly, the relationship between the actual angular deformation and the angular velocities measured by the gyroscopes in the master and slave inertial navigation systems (INSs) is derived to roughly estimate the angular deformation. Secondly, according to the error characteristics of gyroscopes, the error model of angular deformation is established. Thirdly, expanding the angular deformation error instead of the installation error angle, flexure angle and flexure angle rate into the state vector, a low-order transfer alignment filtering model independent of the empirical angular deformation model is established. The proposed method not only gets rid of the dependence on an empirical angular deformation model, but also realises the rapid and accurate initial alignment of the slave INS without adding any external measurement equipment. The simulations and experiments evidence the validity of the proposed transfer alignment method.
摘要本文针对传统的基于外部测量设备或角度变形经验模型的传递对准方法的局限性,提出了一种不依赖角度变形经验模式的快速准确的传递对准法。首先,推导了主惯性导航系统和从惯性导航系统中陀螺仪测量的角速度与实际角变形之间的关系,以粗略估计角变形。其次,根据陀螺的误差特性,建立了陀螺角变形的误差模型。再次,将角变形误差从安装误差角、弯曲角和弯曲角率扩展到状态向量中,建立了一个独立于经验角变形模型的低阶传递对准滤波模型。该方法不仅摆脱了对经验角变形模型的依赖,而且在不增加任何外部测量设备的情况下实现了从INS的快速准确初始对准。仿真和实验证明了所提出的转移对准方法的有效性。
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引用次数: 0
A novel hybrid observation prediction methodology for bridging GNSS outages in INS/GNSS systems 一种新的混合观测预测方法,用于弥补INS/GNSS系统中的GNSS中断
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-23 DOI: 10.1017/S037346332200025X
Linzhouting Chen, Zhanchao Liu, Jiancheng Fang
Abstract The integration of the inertial navigation system (INS) and global navigation satellite system (GNSS) is suited for localisation and navigation applications, such as aircrafts, land vehicles and ships. The primary challenge is for navigation system to achieve accurate and reliable navigation solution during GNSS outages. This paper presents an observation prediction methodology for INS/GNSS bridging GNSS outages, which combines partial least squares regression (PLSR) and Gaussian process regression (GPR) to model the INS/GNSS observations and enable a Kalman filter to estimate INS errors. The performance of proposed PLSR/GPR prediction methodology was validated through four GNSS outages taken on flight experiment data, including diverse manoeuvre conditions. The experiment results demonstrate that remarkable performance enhancements are achieved through applying the proposed PLSR/GPR prediction methodology into INS/GNSS integration.
摘要惯性导航系统(INS)与全球卫星导航系统(GNSS)相结合,适用于飞机、陆地车辆和船舶等定位和导航应用。导航系统面临的主要挑战是在GNSS中断期间实现准确可靠的导航解决方案。本文提出了一种结合偏最小二乘回归(PLSR)和高斯过程回归(GPR)对INS/GNSS观测数据进行建模,并利用卡尔曼滤波对INS误差进行估计的INS/GNSS桥接中断观测预测方法。通过四次GNSS中断飞行实验数据,包括不同的机动条件,验证了所提出的PLSR/GPR预测方法的性能。实验结果表明,将所提出的PLSR/GPR预测方法应用于INS/GNSS集成,可以显著提高系统性能。
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引用次数: 3
Study on site selection for a cruise home port in the Yangtze River Delta region from the perspective of safety 基于安全视角的长三角邮轮母港选址研究
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-23 DOI: 10.1017/S0373463322000169
Zhaoqian Su, Yingjie Xiao
Abstract To improve the safety of cruise tourism in the Yangtze River Delta region (YRD), a new cruise ship home port is needed. This paper studies the process for selection of a site for the new cruise home port. Through analysis of previous cases of cruise tourism safety accidents, it is found that the basic situation of the cruise port, such as the channel, the port, logistics support and scenic places to visit, is important to cruise operation safety. An index system of site selection for a cruise home port is established, and the optimal choice of location for a regional cruise home port – between Shanghai, Zhoushan and Nantong – is analysed by the analytic hierarchy process (AHP). The research shows that the order of preferred site for the cruise home port is Zhoushan, then Shanghai and, third, Nantong. This paper can provide a reference for the layout of the whole industry chain of the cruise economy in the YRD in the future. This will promote the integration of development of the YRD, and enhance the regional connectivity and policy system efficiency in the YRD.
摘要为了提高长江三角洲地区邮轮旅游的安全性,需要一个新的邮轮母港。本文研究了邮轮新母港选址过程,通过对以往邮轮旅游安全事故案例的分析,发现邮轮港口的基本情况,如通道、港口、物流保障和游览景点,对邮轮运营安全具有重要意义。建立了邮轮母港选址指标体系,运用层次分析法对上海、舟山、南通三地区域邮轮母港的选址进行了优化分析。研究表明,邮轮母港的首选地点依次为舟山、上海和南通。本文可为未来长江三角洲邮轮经济全产业链布局提供参考。这将促进长江三角洲的一体化发展,提高长江三角洲区域连通性和政策体系效率。
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引用次数: 0
Robust stereo visual odometry: A comparison of random sample consensus algorithms based on three major hypothesis generators 鲁棒立体视觉里程计:基于三种主要假设生成器的随机样本一致性算法的比较
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-12 DOI: 10.1017/S0373463322000236
Guangzhi Guo, Zuoxiao Dai, Yuanfeng Dai
Abstract Almost all robust stereo visual odometry work uses the random sample consensus (RANSAC) algorithm for model estimation with the existence of noise and outliers. To date, there have been few comparative studies to evaluate the performance of RANSAC algorithms based on different hypothesis generators. In this work, we analyse and compare three popular and efficient RANSAC schemes. They mainly differ in using the two-dimensional (2-D) data points measured directly and the three-dimensional (3-D) data points inferred through triangulation. This comparison presents several quantitative experiments intended for comparing the accuracy, robustness and efficiency of each scheme under varying levels of noise and different percentages of outlier conditions. The results suggest that in the presence of noise and outliers, the perspective-three-point RANSAC provides more accurate and robust pose estimates. However, in the absence of noise, the iterative closest point RANSAC obtains better results regardless of the percentage of outliers. Efficiency, in terms of the number of RANSAC iterations, is found in that the relative speed of the perspective-three-point RANSAC becomes superior under low noise levels and low percentages of outlier conditions. Otherwise, the iterative closest-point RANSAC may be computationally more efficient.
摘要几乎所有稳健的立体视觉里程计工作都使用随机样本一致性(RANSAC)算法在存在噪声和异常值的情况下进行模型估计。到目前为止,很少有比较研究来评估基于不同假设生成器的RANSAC算法的性能。在这项工作中,我们分析和比较了三种流行且有效的RANSAC方案。它们的主要区别在于使用直接测量的二维(2-D)数据点和通过三角测量推断的三维(3-D)数据点。这种比较提供了几个定量实验,旨在比较每个方案在不同噪声水平和不同百分比的异常值条件下的准确性、稳健性和效率。结果表明,在存在噪声和异常值的情况下,透视三点RANSAC提供了更准确和稳健的姿态估计。然而,在没有噪声的情况下,无论异常值的百分比如何,迭代最接近点RANSAC都能获得更好的结果。就RANSAC迭代次数而言,发现效率在于,在低噪声水平和低百分比的异常值条件下,透视三点RANSAC的相对速度变得优越。否则,迭代最近点RANSAC在计算上可能更高效。
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引用次数: 1
A review of flight trajectory optimisations 飞行轨迹优化的回顾
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-01 DOI: 10.1017/S0373463322000248
O. Pleter, C. Constantinescu
Abstract The paper reviews the optimisation methods of the flight trajectory for airliners. In contrast to maritime navigation, where the shortest route (the orthodrome) is preferred, in air navigation, the brachistochrone is the optimal flight trajectory on the sphere or on the ellipsoid, considering the wind vector field (maximising the tail wind and minimising the head wind over the duration of the flight). The major impact of the wind on the flight trajectory results from the possible significant velocity at the normal cruise flight levels, which could reach 200 kts, or 40% of the aircraft true airspeed (TAS). Brachistochrone is independent of the flight performance optimisation (range versus speed), as computed by the flight management system. Whichever cost index (CI) is selected (and consequently, the cruise Mach number), the brachistochrone is the minimum time of flight trajectory at that target Mach number. In cruise flight, the minimum time of flight is also equivalent to the minimum fuel consumption. It concerns just the wind velocity field. All these qualify the brachistochrone as the greenest trajectory, the most fuel and emissions efficient solution relative to the atmosphere. The paper classifies the brachistochrone problems (2D, 3D and 4D brachistochrones, with or without flexible time of departure). Some numerical examples are provided. The overall optimal 4D trajectory considers many aspects, including safety, by minimisation of total costs and risks of the 4D trajectory.
摘要本文综述了客机飞行轨迹的优化方法。与海上导航不同的是,在空中导航中,最短路线(正射场)是优选的,考虑到风矢量场(在飞行过程中最大化尾风并最小化逆风),腕式时间是球体或椭球体上的最佳飞行轨迹。风对飞行轨迹的主要影响源于正常巡航飞行水平下可能的显著速度,该速度可能达到200 kts,即飞机真实空速(TAS)的40%。根据飞行管理系统的计算,短时程与飞行性能优化(航程与速度)无关。无论选择哪一个成本指数(CI)(以及巡航马赫数),腕式时间是该目标马赫数下飞行轨迹的最小时间。在巡航飞行中,飞行的最短时间也相当于最低油耗。它只涉及风速场。所有这些都使腕式时序成为最环保的轨迹,是相对于大气而言最具燃料和排放效率的解决方案。本文对腕表时间问题(2D、3D和4D腕表时间,有或没有弹性出发时间)进行了分类。给出了一些数值例子。总体最优4D轨迹考虑了许多方面,包括安全性,通过最小化4D轨迹的总成本和风险。
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引用次数: 0
NAV volume 75 issue 3 Cover and Back matter NAV第75卷第3期封面和封底
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-01 DOI: 10.1017/s0373463322000388
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引用次数: 0
NAV volume 75 issue 3 Cover and Front matter NAV第75卷第3期封面和封面
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-01 DOI: 10.1017/s0373463322000376
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引用次数: 0
Effect of perception difference between first- and third-person perspectives on local and global situation recognition in ship handling 船舶操作中第一和第三人称视角感知差异对局部和全局态势识别的影响
IF 2.4 4区 工程技术 Q2 ENGINEERING, MARINE Pub Date : 2022-05-01 DOI: 10.1017/S0373463322000224
Yuki Kato, Tomoya Horiguchi
Abstract Remote monitoring and control systems are being used with more frequency, but the characteristics of situational awareness and decision-making from remote locations are largely unknown. Remote operators’ sources of information differ from on-board sources greatly in terms of perspective, field of view, and available data type (qualitative or quantitative). This study focused on clarifying the cognitive effects of first- and third-person perspectives on ship handling. A working hypothesis was formulated based on the findings of visual information processing and previous studies and tested using a developed ship handling simulator. The results revealed that: (1) the cognitive characteristics of the first-person perspective make it more effective in safely guiding ship handling than does the third-person perspective, and (2) the deviation in cognitive characteristics is prominent where collision can be easily avoided. The findings will aid the development of on-board and remotely piloted vessels and ensure the safety of their crews.
远程监控系统的使用频率越来越高,但远程位置的态势感知和决策特性在很大程度上是未知的。远程操作人员的信息来源与机载信息来源在视角、视野和可用数据类型(定性或定量)方面有很大不同。本研究的重点是澄清第一和第三人称视角对船舶操作的认知影响。根据视觉信息处理的结果和前人的研究,提出了一个工作假设,并利用开发的船舶操纵模拟器进行了验证。结果表明:(1)第一人称视角的认知特征使其比第三人称视角更有效地指导船舶安全操作;(2)在容易避免碰撞的情况下,认知特征偏差突出。这一发现将有助于机载和遥控船只的发展,并确保船员的安全。
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引用次数: 1
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Journal of Navigation
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