Archive for 2006

NAVITEC Workshop Report

Thursday, December 14th, 2006

GNSS Antenna Phase Centre corrections

Thursday, November 30th, 2006

For precise GPS positioning and scientific applications it is important to recognize that the antenna phase centers do not represent fixed points with respect to the antenna reference marker (neither at the emitter end or at the receiver end).

The antenna phase center is the point where the receiver detects the signal and on the emitter side where the signal originates, this point actually moves as the geometry changes. The PCV (phase center variation) file has been used up to GPS wk1400 (Nov, 2006) to correct the GNSS measurements, this file specifies the corrections depending on elevation angle for most GNSS receiver antennas. The corrections are specified in relative terms by assuming that the first mass produced geodetic antenna (DORNE MARGOLIN) was giving the ground truth and all the other antennas where calibrated to that model antenna. The satellites were assumed not to have zenith variations and the Phase Center to Center Of Mass vectors where agreed to, according the GPS satellite block:

/* CLK ANT Z-OFFSET (M): II/IIA 1.023; IIR 0.000

Since GPS wk1400 the antenna calibrations have been changed. This effect has recently been calibrated for a very large number of antennas in an absolute sense using most available data from the last few years, and presented in a new international format called ANTEX (ATX). The new absolute calibration has as before L1 and L2 offsets (1st order effects) for all antenna types (receivers and now satellites!), it also contains elevation(zenith) dependent corrections for all antennas (2nd order effect), additionally there are azimuth effects (3rd order effect) for ground antennas since most of them do not have symmetrical correction maps:

Prestige

What is GNSS about …

Wednesday, September 27th, 2006

GNSS options

Friday, August 4th, 2006

Navigation and P-commerce

Monday, June 19th, 2006

Position and Navigation are the latest addition to the new economy, it is becoming necessary to be able to position every valuable item in the economy. This will be accomplished by GNSS services in the next decade.

An additional benefit will be the ability of certifying a position whenever it is needed. For example proving that one is within a certain region to access sensitive data or information.

It is also unquestionable to me that all the transport of sensitive or dangerous equipment, materials and residues needs to be properly tracked whether travelling by air, sea or land. Especially in areas as heavily populated as Europe it makes no sense to endanger the people and the livelyhood of thousands of people by uncontrolled dangerous shipments. In cases like the ship Erika (tanker that sank near France) and the Prestige (tanker that sank near Spain) the case has been proven that these ships need to report their certified position to central a “traffic control” center. The certified position would come from the combination of the Satellite Navigation Services (GPS, GLONASS, Galileo).

Prestige

What is needed now is the agreement at governmental level and of the shipping companies that it is in everyone’s benefit to add this kind of equipment to ships to improve their services and everyone’s safety.

Happy Positioning!

Ignacio Romero
Director

Canary Advanced Solutions starts!

Friday, May 5th, 2006

Soluciones Avanzadas Canarias arranca!

Friday, May 5th, 2006

Lo que más nos motiva en Soluciones Avanzadas Canarias es nuestra area de trabajo: La Navegación por Satélite : GPS, GLONASS, Galileo. La navegación por satélite presenta una serie de oportunidades fantásticas en el futuro próximo. Estamos pasando de la era de la “información” a la era de la “posición”. Los mismos paradigmas seguirán existiendo pero cada vez más y más añadiremos contexto y valor a la información con la posición y el tiempo, en “tiempo real”. La posibilidad de certificar una posición y un tiempo añadirá servicios en aplicaciones tanto críticas como no críticas en los próximos años, de una forma todavia ¡inimaginable!

Otra cosa que nos motiva mucho en Soluciones Avanzadas Canarias es la provisión de servicios de ingeniería de manera remota; ¡el llamado tele-trabajo es algo que funciona! En los últimos años hemos acumulado mucha experiencia y hemos encontrado que usando buenas prácticas de comunicación y de ingenieria no hace falta tener a todos los desarrolladores de un sistema complejo en el mismo lugar. Desde el 2004 venimos demostrando que grandes organizaciones pueden ahorrarse tiempo, dinero y problemas y, a su vez, obtener resultados superiores, si se aplican bien las lecciones aprendidas y se distribuyen los equipos de desarrollo sobre diferentes áreas geográficas. Soluciones Avanzadas Canarias puede ayudar a cualquier empresa a implementar estas lecciones: Contáctenos si le interesa que estudiemos juntos su problema particular.

Les invito a leer los blogs donde desarrollamos las ideas de la empresa y del mundo GNSS, y también les invito a contactarnos con cualquier duda o idea que le surja.