Centre National Detudes Spatiales

Commissariat a L'energie Atomique

Jean-Jacques Favier

Jean-Pierre Antikidis

Jean Comera

Andre Rouzaud

Pierre Contamin

Guy Marquet

A method of acquiring, compressing and transmitting satellite images, characterized in that in a systematic manner: an image is acquired (); () the image is processed by an image preprocessing step providing a value characteristic of the image and an image preprocessed by recognizing predetermined natural objects in the acquired image and replacing the natural objects by standard objects; the characteristic value is compared () with a table of values, each value of which is associated with a compression algorithm; the compression algorithm corresponding to the characteristic value is implemented () by compression elements for compressing the image; the compressed image is transmitted () to a remote image reception device by transmission elements.

Compression of earth observation satellite images

A method of acquiring and repatriating satellite data representative of a zone in space, termed the target zone, and an instrument for acquiring and repatriating satellite data including a plurality of satellites (), a plurality of terrestrial receiving stations (), the instrument includes, for each item of data received by a receiving station (), termed the receiving station, originating from the space layer: elements for determining a receiving station () intended for storing this item of data, termed the receiving station competent in respect of this item of data, and a terrestrial digital network for routing this item of data from the station receiving this item of data to the receiving station competent in respect of this item of data.

Method and system for acquiring and repatriating satellite data

An apparatus for use in solidification of a doped electrically conducting material and for use in monitoring said solidification is provided. The apparatus includes a first forming means for forming a liquid of undoped material in thermodynamic equilibrium with a solid of the undoped material, and a second forming means for forming a liquid of doped material in thermodynamic equilibrium with a solid of the doped material. Solidification of the conducting material occurs at a solidification interface between the doped liquid and the doped solid in the second forming means. In one preferred embodiment, the apparatus comprises a conductive bridge for short-circuiting the liquids.

Apparatus for the solidification of a doped electricity conducting

The present invention relates to a process and an apparatus for checking the supercooling of a monocrystal during its formation. There is a continuous measurement of the potential difference between one point of the forming crystal and one point of a solid part of the material separated from the liquid by a reference interface differing from the solidification front. This potential difference makes is possible to determine the temperature deviation due to the supercooling at the solidification front and the dopant concentration of the crystal being formed.

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Montastruc la Conseillere, France

Jean-Jacques Favier