Welcome to the GNSS blog


4 new Galileo satellites

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At the GA !!

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Galileo 5,6 launch and orbit update

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Galileo bad orbit insertion

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AGU2013 IGS Infrastructure Committee poster

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TELECAN project comes to a close

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The CGC continues to grow

Public GNSS data availability for the African continent has been a significant issue for sometime. Due to lack of a good communication infrastructure it is difficult to establish, operate and maintain permanent GNSS stations in our continent. (Yes as a person from the Canary Islands I consider myself geographically African as we have the mainland […]

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IGS Workshop 2012

This past July we held the IGS workshop in Poland at a beautiful location about 3 hours from Warsaw at the university were Copernicus taught, amazing. The location was beautiful, the organization very efficient and the attendance was very good. As seen in the image I gave a nice presentation on the state of the […]

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IGS MGEX Project

The IGS has created a new project called MGEX to gather and process multi-GNSS data. IGS MGEX stands for Multi GNSS Experiment and it was proposed and is managed by the IGS GNSS Working Group. The main aim is to collect GNSS data containing more than GPS+GLONASS data. Currently there are a multitude of modern […]

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IGS Co-located Station Antenna Tests

GNSS stations of the IGS are very important, especially when they are located at locations with other space techniques such a Satellite Laser Ranging (SLR) and Very Long Based Interferometry (VLBI), which all provide inputs to the establishment of the Earth’s International Reference Frames. The ‘ties’ between all the different antenna’s reference points is essential […]

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P1C1 biases from different sources

Coming back to this issue we have encountered a significant problem. As remarked before in this blog P1C1 biases we have to be able to correct the C1 measurements from GPS to mix them correctly with the P1 measurements. This comes from the fact that when the signal is encoded in the satellite there is […]

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IGS positioning on phase aligment for GPS L2 data

The members of the Infrastructure Committee have prepared the following statement which was distributed to the receiver manufacturers late in 2010 by the IGS Governing Board: We have come to this consensus at the IGS to speak with one voice and to send a clear message that the manufacturers need to provide phase measurements on […]

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PRN22 Signal Anomaly

It has been reported over the last few days of 2010 that satellite PRN22 (G22, SVN 47) has had issues. Essentially the satellite had an issue with its navigation signal in that the Differential Code bias had changed a whole lot! this meant that the P1C1 biases we were all applying to be able to […]

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Rinex Observables

What an issue!! We are facing a very significant problem in the current Rinex data files , and I need to tell you about it! The Rinex 2.11 format is defined without regard to where the phase is actually coming from (the C/A or the P code tracking). This has for the longest time not […]

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Eumetsat Meteo Satellite Conference

I just attended the Eumetsat Meteo Satellite Conference in Cordoba, Spain at a beautiful location right by the Mezquita. The event brings together many satellite Meteo researchers. As you know most Meteorological satellites carry on-board many different scientific instruments, and this conference brings together a very heterogeneous group of scientific people which as very informative […]

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IGS Workshop 2010

Let me share with you my two presentations at the IGS Workshop, 2010 held in Newcastle in 2010. I gave a presentation on the overall state of the IGS Infrastructure up and down the Rinex data chain, considering both the challenges faced by the station operators, the data centers and the Analysis Centers. The second […]

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IGS Station Height Tests

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Monitoring the Sky for Astronomy with GPS

SAC has continued to support the IAC (Instituto Astrofisico de Canarias) by calculating the Precipitable Water Vapor (PWV) at the Observatorio Roque de los Muchachos (ORM) in La Palma. The island of La Palma is about 250 Km from Gran Canaria where SAC is based, both in the archipelago of the Canary Islands, Spain, of […]

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IGS Infrastructure Committee / Comité de Infraestructura del IGS

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PRN01 … not quite working as expected

PRN01 is one of the latest GPS satellites launched on 24 March 2009. Over the summer we have been investigating what the deal is with this satellite which is still not set to healthy. When a GPS satellite is launched it goes through a period of a few weeks of commissioning. This period involves in-orbit […]

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GPS-GLONASS biases … a receiver issue

GNSS receivers decode all the signals ‘more or less’ at the same time, the time is really set by the GPS but the other systems (Glonass) have a bias so that apart from the clock bias per satellite there is an inter-system bias between the constellations (at least that is what we thought!! here is […]

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At the EGU General Assembly 2009

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GPS launch opens new capability

New GPS satellite!! The launch and start of operations of the new SVN49/PRN01 is excellent news. You can follow the report on the news of the launch here, for example: Delta II launches penultimate GPS-IIR satellite. This satellite is interesting because it has an experimental L5 signal transmitter. This would be the third signal for […]

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SAC helping the ESA/ESOC GPS Reprocessing

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Vapor de Agua sobre Observatorio Roque de los Muchachos (LPAL)

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What is EGNOS?

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IGS reprocessing, an exciting project!

After the IGS workshop which we recently concluded to great success, one of the most important and interesting activities for the near future is the reprocessing of all the historical IGS data using current state-of-the-art techniques. Reprocessing of GPS data back to 1994 is a high-priority of the IGS since modern techniques can better estimate […]

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The CGC Station Information System

CGC Station System – Manual de Uso

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IGS Workshop 2008 Contents & Summary

Incorporating the 2nd and 3rd order iono corrections to the GPS processing Correlating antenna monuments with problems in our ESA IGS processing Participating in the incipient IGS Infrastructure Committee Learning more about the albedo/infrared implementation to resolve the SLR residual issues in the GPS processing

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The IGS Workshop 2008

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Datos GNSS libres y abiertos de España

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Data Policy – Política de Datos

Política de Datos es la especificación clara y por escrito por la institución que instala una estación permanente GNSS para que los datos recabados sean de dominio público en algun momento. Especificando un tiempo determinado para acceder a los datos es fundamental para que los datos, que normalmente se han pagado por todos los contribuyentes, […]

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Estaciones GNSS en Canarias

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P1-C1 bias … and other Code biases

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It’s official Space is no longer free …

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Vehicle management using GPS … my experience so far.

1 minute position updates are not enough for the islands where the roads are very winding so it should be possible to select the time between updates. Some of my trips do not make any sense because the 1 minute update times skip many turns, exits, etc. The response is too slow, for some reason […]

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GIS applications

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Space is not free anymore ??

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Satellite Navigation current status

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Selective Availability OFF forever

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Galileo has the money!!

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GGTO – an interesting correction

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GPS Control Center updated!

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Where is GNSS heading

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RealTrack football (I mean soccer!)

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what GNSS signals do we have …

C1 ; Ranging to the satellite based on the Civil message. P1 ; Ranging to the satellite based on the Encrypted (high-security) message. L1 ; Number of cycles since satellite acquisition. P2 ; Ranging to the satellite based on the Encrypted (high-security) message. L2 ; Number of cycles since satellite acquisition.

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On the real Galileo benefits

It reduces the pressure on GPS and promotes healthy competition. It helps to push GPS stakeholders “to stay ahead” of Galileo developments, otherwise we would live in a C1, L1, L2, P2, P1 world for how much longer? It allows others to develop capabilities complementary to the ones in the US. In the long run […]

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GLONASS and GPS differences

GLONASS is not complete. Whereas GPS has 32 satellites transmitting signals GLONASS only has 14 which does not guarantee world-wide coverage. GLONASS uses FDMA for its transmissions whereas GPS uses CDMA. in FDMA each satellite uses a different frequecy to transmit the same ranging code. in CDMA each satellite uses the same frequency with different […]

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Semana Geomatica

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The Canary GNSS Centre (Centro GNSS Canarias)

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NAVITEC Workshop Report

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GNSS Antenna Phase Centre corrections

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 […]

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What is GNSS about …

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GNSS options

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Navigation and P-commerce

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 […]

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Canary Advanced Solutions starts!

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Soluciones Avanzadas Canarias arranca!

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 […]

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