Centre National Detudes Spatiales

Guy Lesthievent

Jacques Sombrin

Xavier Giraud

Alexandre Guerin

Jean-Pierre Millerioux

Xavier Deplancq

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

A method for eliminating interference signals in a direct sequence spread spectrum link involves frequency detection of interference signals by comparison of the spectrum of the composite input signal with a threshold and filtering of the composite input signal by a finite impulse response filter using rapid convolution. The detection of threshold is automatically controlled by using an estimate of the spectral input density after eliminating large interference signals.

Method and device for eliminating interference signals in a direct

The method of the invention is mixed and uses, in the forward link, the measurement of the phase of tones modulating a carrier and, in the backward link, a spectrum spread by pseudonoise code, which makes it possible to date the reception of the message. Application to the location of miscellaneous moving objects (land, sea, air, etc.).

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Villate, France

Guy Lesthievent