All,

I am forwarding the following for your consideration:

> Subject: Subject to thesis in space geodesy at the Geodesy Observatory

> Tahiti (French Polynesia)

> Subject to thesis in geodesy at the Geodesy Observatory Tahiti (French

> Polynesia)

> Duration: 3 years, from September / October 2016

> Financing: 1463 euros / month after taxes + possibility of paid

> teaching hours (teaching is in French)

> Location: University of French Polynesia, Tahiti (www.upf.pf)

> Supervisor: Prof. JeanPierre Barriot. The PhD is awarded under the French requirements and benefits (same as in mainland France).

> Subject: The propagation delays of radio signals in microwave bands

> (S, X and K) caused by the atmospheric water vapor remain an area of

> active research in space geodesy, with applications in GPS, VLBI, radio tracking of space craft in the solar system, but also in meteorology and climatology.

> We will start this work by a review of all the possible techniques to

> measure, from time scales of a few seconds to time scales of several hours, the water vapor contents of the atmosphere, ie GPS delays, radiometry of the sky temperature, photometry in infrared band and balloon radiosoundings.

> After this first phase, We will do a comparative analysis of the

> "mapping functions" used in orbitography software like GIPSY-OASIS,

> Bernese, Gamit and GINS to model these wet time delays. In a last step, we will validate, at the light of the previous steps, and from 15 years of GPS and radiosounding time series available at our site, a 3D "mapping function" recently developed in-house, which allows both to correct the time delay and infer the variation in time and space of the water contents of the atmosphere above the radiofrequency receiver.

> If time permits, a last step may be dedicated to an in-depth analysis of the photometry of water vapor in infrared band.

> Applications must include:

> - A cover letter,

> - Curriculum,

> - Reference Letters,

> - Marks of Bachelor and Master,

> - The phone number of your master internship supervisor or

> equivalent,

> - TOEFL mark or equivalent for non-native English speakers.

> A good knowledge of a programming language is imperative (FORTRAN, C, Python) as well as a sufficient command of the English language.

> A basic command of the French language will help for the day-to-day life, but it is not a prerequisite.

> Deadline for applications: 5 June 2016

> Decision mid-June

> No nationality requirement

> Tahiti is an autonomous overseas territory of France in the South Pacific, with its own visa requirements.

> The Geodesy Observatory of Tahiti is a joint observatory of the French

> Space Agency (CNES), NASA, and the University of French Polynesia, and is part of the ILRS, IGS, IDS and PMSL networks of the International Association of Geodesy.

> It operates under the umbrella of GGOS (Global Geodetic Observing

> Network)

> Enquiries and email address for applications:

> jean-pierre.barriot@upf.pf

> Please send only *one* consolidated pdf document of less than 4 MBytes, with an ID picture.

> J-Pierre Barriot

> Dir. Geodetic Observatory Tahiti

Forwarded by:

For an accessible version of this material, please contact:

Dave McCormick

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