Phone: (+34) 949290311 Fax: (+34) 949290063

Cerro de la Palera s/n 19141 - Yebes Guadalajara Spain

Phone: (+34) 949290311 Fax: (+34) 949290063

Email: jm.serna@oan.esjm.serna@oan.esjm.serna@oan.esjm.serna@oan.es

RAEGE

The Center for Technological Developments (CDT) is a branch

of the National Geographic Institute of Spain.

RAEGE will consist of the construction and operation of four new

Fundamental Geodetic Stations, where several geodetic techniques

will be co-located. Two stations will be placed in

Spain: one in Yebes (Guadalajara) and one on the Canary Islands.

The other two stations will be placed in Portugal, on the Açores

Islands: one on Santa María and one on Flores.

It is envisaged that each Geodetic Fundamental Station will be

equipped with one radio telescope of VLBI2010 specifications (at

least 12-m diameter, fast slewing speed, but also able to operate up

to 40 GHz), one gravimeter, one permanent GNSS station, and, at

least at the Yebes site, one SLR facility.

Yebes Technological Development Center

Centro de Desarrollos Tecnológicos de Yebes

Instituto Geográfico Nacional (Spain)

Yebes Technological Development Center

Azores stations Stations location Weather and RFI measurements have been carried out to determine

the best locations for the stations (Canary Islands and Azores

Islands).

Other activities

The RAEGE project

Establishment of an Spanish-Portuguese Network of Geody-

namical and Space Geodesy Stations (RAEGE) by the installa-

tion and operation of four fundamental geodetic/astronomical

stations provided with radiotelescopes fulfilling the VLBI

2010 project specifications: Yebes (1), Canary Islands (1) and

Açores Islands (2).

CDT Yebes Geodetic Fundamental StationCDT Yebes Geodetic Fundamental StationCDT Yebes Geodetic Fundamental StationCDT Yebes Geodetic Fundamental Station RAEGE VLBI2010 RADIOTELESCOPE

Characteristics

- MT mechatronics

- 13.2 m RT

- Ring focus

- Freq up to 45 GHz

- Wideband receiver

- Slewing speed 12º/sec (az) & 6º/sec (el)

VLBI2010 Receiver

VLBI2010 antenna and receiver specifications. - Broad bandwidths.

- Compatibility with existing S and X band VLBI systems. - Two approaches: wideband receiver (1-14GHz) and triple

band receiver (S, X, Ka). - Receiver second stage: common to both approaches.

Gravimetry

Precise gravity time series are a complement to space geodetic

measurements as VLBI, GNSS and SLR. A superconducting

gravimeter (OSG) gives in combination with repeated absolute

gravity measurements (FG5, A10) information on vertical posi-

tion changes independent on the realization of a terrestrial refer-

ence frame. Further, the gravity data allows determine a most

accurate site specific tidal model, which could be used to investi-

gate the best tidal correction for the space techniques.

Satellite Laser Ranging SLR Technique principle: Precise range measurement of the round-

trip time-of-flight of an ultrashort laser pulse between an SLR

ground station and a retroreflector equipped satellite.

Official products and applications:

- Station coordinates and Earth Orientation Parameters (EOP).

- Development and maintenance of the Terrestrial Reference

Frame with VLBI and GPS.

SLR => Geocenter motion and Earth scale (GM)

- Precision orbit determination (POD), centimeter accuracy

(LAGEOS ~1-2 cm , GPS ~2-3 cm ).

GNSS (GPS, GLONASS, GALILEO)

The Global Navigation Satellite Systems include currently GPS

(USA) and GLONASS (Rusian) and, in the future, Galileo (EU) and

BeiDou (China). GNSS is the most extended spatial geodetic

technique. It is possible to estimate the position of any point on

Earth (including satellites and airplanes), tectonic plates velocity,

atmospheric water vapor, ionosphere activity or time

synchronization. Thanks to GNSS observations, the other spatial

geodesic techniques can be combined to form the international

geodetic reference frame.

Yebes Station

BaselineBaselineBaselineBaseline Distance (Km)Distance (Km)Distance (Km)Distance (Km)

Yebes-Canary Islands 2150

Yebes-Sao Miguel 2000

Yebes-Flores 2400

Canary Islands-Flores 2000

Sao Miguel-Flores 530

Initial equipment to be installed at each station

- Geodetic VLBI 2010 radiotelescope:

Diameter=13m, freq. up to40GHz

vAz: 12 deg/s . vEl: 6 deg/s

- Gravimeter.

- Permanent GNSS station.

- Satellite Laser Ranging (Yebes).

Motivation

- Joint VLBI2010: 1mm accuracy for site position and 1mm/

year velocity. Continuous observation of Earth orientation

parameter. Reduced data acquisition time. How? To use

many more observations per session, use much more precise

delay observables, improve network geometry, reduce impact

of systematic errors, improve analysis strategies.

- Network of Geodetic fundamental stations on three different

tectonic plates

- Improve Geodetic and Geophysics development in Spain.

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