Centre National Detudes Spatiales

Irt Saint Exupery (aese)

Jacques Sombrin

Geoffroy Soubercaze-Pun

Isabelle Albert

Nicolas Capet

Xavier Giraud

Jean-Pierre Millerioux

Alexandre Guerin

Daniel Renaud

Guy Lesthievent

Xavier Deplancq

Alban Duverdier

Jean-Paul Aguttes

Jacques Decroix

Christian Boschet

Jérôme Puech

Philippe Moreira

Eric Conde

Gilles Mesnager

Nelson Fonseca

Caroline Bazile

A method and a device for predictive evaluation of intermodulation power in an electronic device in which a predictive function f makes it possible to evaluate in a predictive manner values of power of an intermodulation component produced by an intermodulation distortion of an input signal, characterized in that the predictive function f includes an odd part V obtained by multiplication of an odd function F and of a function G, obtained by composition of a positive real-valued even function g and of a function Q in the form of a real series including at least one term of degree q belonging to the non-integer reals.

Method and device for predictive evaluation of the intermodulation power in an electronic device

A process and a device for measuring intermodulation products by wave reflection on a non-linear object (), including two electromagnetic sources () of distinct focal points emitting fundamental components, and a receiver (), the process includes a step in which the measuring device is in a configuration so that the receiver () produces a signal for a first composition of the enriched wave (), and a second step in which the measuring device is in a second configuration so that the receiver () produces a measuring signal for a second composition of the enriched wave ().

Process and device for measuring intermodulation products by reflection of electromagnetic waves on an object

Method for calibrating a linearizer and linearized electronic component the method comprises predistortion, in a predistortion linearizer, of a signal upstream of an electronic component to compensate nonlinear distortion. Determining predistortion setting parameters comprises applying a bifrequency test signal to the component and measuring the relative amplitudes of the lines at the output of the component. A variable indicative of the magnitude |Kp| of the AM/PM conversion coefficient of the component is calculated on the basis of these measurements. The predistortion setting parameters are adjusted so as to minimize |Kp|. The method may in particular be implemented in a linearized amplifier device and in an amplifier test bench.

Method for calibrating a linearizer and linearized electronic component

Amplitudes and phases of different channels in an electromagnetic signal transmission network, whereof the sources are arranged in a triangular lattice, are determined by tiling the lattice with hexagons having six equal sides, the hexagonal tiles that are formed are distributed on the lattice such that two successive tiles along a direction in the lattice rectangular height equivalent to the triangular lattice are offset by an elementary step along the width direction. A Fourier transform is performed on the resulting tiles; directions are selected on the resulting new lattice corresponding to the transmission directions; an inverse Fourier transform is performed of the directions; and amplitude and phase coefficients to be applied to the transmission network different channels are deduced from the inverse Fourier transform.

Method for determining amplitudes and phases of the different channels in an electromagnetic signal transmission network, such as a telecommunication satellite antenna

The low earth orbit radar remote sensing or telecommunication satellite includes an antenna forming member in a plane passing through the center of Earth, for example, the plane of its orbit. The antenna(s) are on one or both faces of the member. The height of the antenna forming member is greater than its dimension in the direction of travel of the satellite, so that the satellite is naturally stabilized by the gravity gradient. The solar generator cells are carried by the antenna forming member on the face that is kept facing towards the Sun in the case of a 6 H/18 H local time heliosynchronous orbit. The antenna forming member comprising a plurality of hinged panels over which the received or transmitted wave phase control means are distributed, it includes a plurality of GPS sensors distributed over the panels, enabling measurement and subsequent compensation by the phase-shifters of deformations of the member. At launch, the panels are folded into an elongate cylindrical shell along the launch system axis and having a pyrotechnic trap allowing deployment of the panels. In orbit, this shell constitutes the equipment module integrating all the equipment units other than the panels.

Observation or telecommunication satellites

A device to measure intermodulation products of a receiver of at least two electromagnetic signals of different frequencies comprises at least two channels for the transmission of the signals of different frequencies and one reflective reception channel connected to an apparatus for the measurement of intermodulation products. The reception channel enables the transfer of signals in a frequency band centered on the reception frequency band of the receiver. A reflective reception multiplexer/demultiplexer with directional filters provides for the interconnection of the two transmission channels of the reflective reception channel of the receiver.

Device for the measurement of intermodulation products of a receiver

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Toulouse, France

Jacques Sombrin