Satellite Navigation

Over the last twenty years Global Positioning System (GPS) receivers have revolutionised navigation. Integrated devices are capable of providing time, position, height, direction, heave and attitude, to accuracy of a few nanoseconds time, 1cm position or 0.01-degree heading. This article explores the future development and implications of Satellite Positioning. Satellite Positioning dominates navigation at sea, in the air and on land and is now available in our cell phones and wristwatches. How it currently works was explored in the October 2006 issue of Hydro international in an article titled ‘Satellite Positioning’ (pp 35-39). But how will it work in the... (read more)
2007-01-12 12:00:00

Satellite Positioning

Within the last twenty years Global Positioning System (GPS) receivers have revolutionised navigation. Integrated devices are capable of providing time, position, height, direction, heave and attitude to accuracies of a few nanoseconds time, 1cm position or 0.01 degree heading. All potentially displayed on a digital chart background with radar and auto-identification system overlays. In this first of two articles we look at current Satellite Positioning systems, how they work and how we can make them better. In a second article, to appear next month, we explore the future development of Satellite Positioning and the implications for navigation. How does Satellite... (read more)
2008-01-01 01:00:00

New GPS Satellite Operational

The fourth in a series of eight modernized Global Positioning System (GPS) satellites that will deliver new capabilities to military and civilian users has been declared fully operational.   Launched from Cape Canaveral October 17, the satellite was given the all clear after an on-orbit checkout by a combined U.S. Air Force/Lockheed Martin team. Read more   The satellite joins three IIR-M satellites and 12 other operational Block IIR satellites within the current 28-spacecraft constellation. The fifth GPS IIR-M satellite is scheduled for launch on 20th December 20, 2007 from Cape Canaveral.     (read more)
2007-11-08 10:32:43

China’s Satellite Success

HY-1A, China's first marine satellite, has sent back data on ocean colour, water temperatures and coastal zones since it was launched in May last year. Since September last year, the satellite has monitored large sea areas of China, the Pacific, Indian, Atlantic and Arctic oceans, as well as the North and South poles. In addition, a large number of remote sensing images on water colour have been obtained. Meanwhile, the satellite has monitored many marine disasters, including red tides along China's coast. As part of the marine environment monitoring system, the satellite has also played an important role in curbing... (read more)
2003-11-11 12:00:00

Precision Satellite Navigation System

Fugro Seastar AS has announced the introduction of the MarineSTAR Manoeuvring System. The system provides a highly accurate, stable position reference for ship's bridge systems such as ECDIS. Fugro Seastar claims the data to be of the highest integrity and reliability available in this industry.   In addition to position data, MarineSTAR can provide an alternative to conventional navigation aids such as gyro compass and rate of turn indicator. As well as heading, the system displays and outputs speed over the ground in both the fore and aft and athwartships directions.   The system utilises differential navigation sensors located in... (read more)
2009-06-09 12:00:00

Which Satellite Positioning Systems

The International Marine Contractors Association (IMCA, UK) has published new guidance on the selection of satellite positioning systems, warning that in recent years lower priority has been given to system selection than is wise. This is particularly the case when choosing a dynamic positioning (DP). The guide explains that the use of inappropriate systems has led to delays in project execution, vessel downtime and, in some circumstances, damage to assets. In the introduction to ‘Guidance on the Selection of Satellite Positioning Systems for Offshore Applications' (IMCA S 018) the association explains that the costs incurred during any of these incidents... (read more)
2011-07-08 12:00:00

Global Navigation Satellite Systems

Infrastructure Status and Developments
The concept of GNSS was first introduced by the European Space Agency (ESA), the European Commission (EC) and Eurocontrol in the early nineties. They defined requirements for a European GPS augmentation system, GNSS-1, and a full European satellite navigation system, GNSS-2, later together renamed EGNOS (European Geostationary Navigation Overlay System) and Galileo. Satellite navigation infrastructure status and developments are described here. Nowadays the term GNSS is used for the system of systems comprising GPS and GLONASS, with the later addition of Galileo. Satellite-based and ground-based augmentation systems (SBAS and GBAS) were introduced to augment GPS and GLONASS. Hydrographers were early... (read more)
2008-01-01 01:00:00

Landsat Satellite Spots Shipwrecks

An estimated three million shipwrecks are scattered across the planet’s oceans. Most maritime mishaps occur close to shore where hazards to navigation — such as rocks, reefs, other submerged objects and vessel congestion — are abundant. It is desirable to know where they are located for many practical reasons. Streams around the wrecks create plumes that can be seen on satellite imagery in depths up to 15m, making wrecks easier to find as a recent test in Belgium showed. Belgian scientists tested this using four wrecks near Zeebrugge. Their plumes were seen by Landsat-8; the trace was followed, leading to the wrecks. The... (read more)
2016-03-15 02:53:30

Copernicus Satellite Now Operational

With the commissioning of Sentinel-1A completed and the satellite’s transfer for exploitation, its data is now available to all users. This marks the beginning of the satellite’s operational life, delivering radar coverage for an array of applications in the areas of oceans, ice, changing land and emergency response. Launched on 3 April, Sentinel-1A completed commissioning on 23 September – an important process that ensures the satellite, instruments, data acquisition and data processing procedures are working well. Sentinel-1A passed these tests and reached its target orbit on 7 August and eight anticollision manoeuvres to avoid space debris were performed during this... (read more)
2014-10-07 08:30:00

Glonass-K Satellite Launched

The Russian Space Forces have successfully launched a new Glonass-K navigation satellite from the Plesetsk space center, a Defense Ministry spokesman said Saturday. The previous launch under the Glonass project in December 2010, supposed to conclude the forming of the satellite grouping, was unsuccessful as the rocket veered off course and sunk in the Pacific Ocean. The loss cost Russia 2.5 billion rubles (USD86 million) in direct damages. The Glonass-K, which has a service life of ten years, will beam five navigation signals - four in the special L1 and L2 bands and one for civilian applications in the L3... (read more)
2011-02-28 11:42:39
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