Sight reduction tables for marine navigation /

Mode of access: Internet.

Environmental modeling with precision navigation using ROAZ autonomous surface vehicle

The use of robotic vehicles for environmental modeling is discussed. This paper presents diverse results in autonomous marine missions with the ROAZ autonomous surface vehicle. The vehicle can perform autonomous missions while gathering marine data with high inertial and positioning precision. The underwater world is an, economical and environmental, asset that need new tools to study and preserve it. ROAZ is used in marine environment missions since it can sense and monitor the surface and underwater scenarios. Is equipped with a diverse set of sensors, cameras and underwater sonars that generate 3D environmental models. It is used for study the marine life and possible underwater wrecks that can pollute or be a danger to marine navigation. The 3D model and integration of multibeam and sidescan sonars represent a challenge in nowadays. Adding that it is important that robots can explore an area and make decisions based on their surroundings and goals. Regard that, autonomous robotic systems can relieve human beings of repetitive and dangerous tasks.

Towards forecasting and mitigating ionospheric scintillation effects on GNSS

The effect of the ionosphere on the signals of Global Navigation Satellite Systems (GNSS), such as the Global Positionig System (GPS) and the proposed European Galileo, is dependent on the ionospheric electron density, given by its Total Electron Content (TEC). Ionospheric time-varying density irregularities may cause scintillations, which are fluctuations in phase and amplitude of the signals. Scintillations occur more often at equatorial and high latitudes. They can degrade navigation and positioning accuracy and may cause loss of signal tracking, disrupting safety-critical applications, such as marine navigation and civil aviation. This paper addresses the results of initial research carried out on two fronts that are relevant to GNSS users if they are to counter ionospheric scintillations, i.e. forecasting and mitigating their effects. On the forecasting front, the dynamics of scintillation occurrence were analysed during the severe ionospheric storm that took place on the evening of 30 October 2003, using data from a network of GPS Ionospheric Scintillation and TEC Monitor (GISTM) receivers set up in Northern Europe. Previous results [1] indicated that GPS scintillations in that region can originate from ionospheric plasma structures from the American sector. In this paper we describe experiments that enabled confirmation of those findings. On the mitigation front we used the variance of the output error of the GPS receiver DLL (Delay Locked Loop) to modify the least squares stochastic model applied by an ordinary receiver to compute position. This error was modelled according to [2], as a function of the S4 amplitude scintillation index measured by the GISTM receivers. An improvement of up to 21% in relative positioning accuracy was achieved with this technnique.

Outlines of naval routine.

Mode of access: Internet.

METODOLGÍA DE TRABAJO CON LOS SISTEMAS DE POSICIONAMIENTO GLOBAL

Desde hace algunos años los sistemas de Posicionamiento Global (SPG) se están imponiendo como una herramienta interesante e, incluso, imprescindible para el posicionamiento y la navegación – marítima, aérea y terrestre – y con importantes aplicaciones en los campos de la cartografía, la teledetección, los sistemas de información Geográfica, la Topografía, etc. En este artículo realizamos una introducción a los SPG, haciendo un repaso de los componentes, de la forma de calcular la distancia, de la precisión y de la metodología de trabajo con ellos.ABSTRACT For some years now, Global Positioning Systems (GPS) have become interesting and indispensable tools for determining geographical positioning for air, land and marine navigation, as well as having important applications in the area on Cartography, Remote Sensing, Geographical Information Systems, Surveying, etc. In this article, we present an introduction to GPS and summarize the necessary components, ways to calculate distance and precision, and methodologies for working with them.

Dictionnaire de Marine : contenant les termes de la navigation et de l'architecture navale avec les régles [et] proportions qui doivent y être observées : ouvrage enrichi de figures.

Mode of access: Internet.

Traitez de paix et de commerce, navigation et marine entre la France et l'Anglaterre : conclus à Utrecht le 11 avril 1713.

Mode of access: Internet.

The elements of navigation; containing the theory and practice. With the necessary tables, and compendiums for finding the latitude and longitude at sea. To which is added, a treatise of marine fortification. Composed for the use of the Royal Mathematical School at Christ's Hospital, the Royal Academy at Portsmouth, and the gentlemen of the Navy ...

"A dissertation on the rise and progress of the modern art of navigation," by James Wilson: v. 1, p. [i]-xxx.

Navigation aérienne et navigation sous-marine; deux faces d'un même problème ...

Mode of access: Internet.

De l'état actuel de la navigation par la vapeur et des améliorations dont les navires et appareils à vapeur marins sont susceptibles : suivi de notes explicatives, tableaux, projects, etc., ouvrage pub. sous les auspices du ministre de la marine : supplément, description et détails de construction d'un appareil à vapeur marin : instruction sur la conduite, la manœuvre et l'entretien des machines à bord des bâtiments à vapeur /

Mode of access: Internet.

Inspection of fishing vessels. Hearings before the Committee on Merchant Marine and Fisheries, House of Representatives, Seventy-seventh Congress, first session, on H.R. 3254, a bill to safeguard and protect further the lives of fishermen at sea and to place fishing boats under the supervision of the Department of Commerce, Bureau of Marine Inspection and Navigation, and for other purposes. October 14, 23, 24, 1941.

Schuyler Otis Bland, chairman.

Waiving Navigation and Inspection Laws : Hearing before the Committee on the Merchant Marine and Fisheries, House of Representatives, Seventy-seventh Congress, first session, on H. R. 5111, a bill authorizing the waiver of the navigation and inspection laws during the national emergency. July 1, 1941 ...

Schuyler O. Bland, chairman.