Thales

Franck Letestu

Nicolas Martin

Marc Revol

Alain Renard

Valéry Leblond

Vincent Chopard

Bruno Montagne

System for receiving satellite signals jammed by at least one source of interference and by a thermal noise comprising means for receiving the said satellite signals, means for filtering the said satellite signals, in order to remove the disruption from the said sources of interference. The system also comprises first means for determining a first covariance matrix of the satellite signals, adding means for adding respectively a first coefficient to at least one element of the diagonal of the said first covariance matrix in order to obtain a second covariance matrix, second means for determining, on the basis of the said second covariance matrix, second coefficients used by the said filtering means. The system also comprises means for detecting a first power of the said thermal noise, third means for dynamic determination of the value of the said first coefficients, on the basis of the first power.

System for receiving satellite signals

Apparatus and methods degarble a received broadband radio signal using spatial filtering. The apparatus and methods use various garbled versions of the signal delivered by parallel processing chains assumed to have the same transfer function. Automatic equalization (), at the level of the outputs of the processing chains (to), is performed before the spatial filtering (). The automatic equalization reduces disparities, innate or originate from drifts over time, between processing chains (to), and uses a local test signal generator ().

Interference suppression, method and device, in reception, for a wideband radio signal

The invention allows the detection and processing in a radio signal received by a receiver, of any signal of 'pulsed' type present in radio signals applied to the input of a radiofrequency receiver, the receiver having an analogue/digital converter for performing the coding into digital on N bits of P successive samples of the analogue signal applied to the input of the receiver and a computer for processing the said digital signals, characterized in that on the basis of a histogram of the rate of occupancy of the digitized samples, graded in ranges Fx of amplitude-increasing sample levels, is determined, from among the ranges Fx, a range Fn onwards of which the total number of digitized samples Nnor contained in the ranges Fn and those below Fn is greater than or equal to a normality threshold Nn, Nn being a number predetermined as a function of the sensitivity of the detection of pulsed signals that one wishes to achieve.

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Bourg-de-Peage, France

Franck Letestu