Abstract: A geolocation device is disclosed. In one aspect, the geolocation device is adapted for receiving first radioelectric positioning signals from satellites. Each first signal has a first frequency and is generated from a first code specific to the satellite, from which stems the first signal. The device includes a first antenna configured to receive a geolocation signal, and a processing unit configured to determine a piece of positioning information of the device according to the geolocation signal which the first antenna is configured to receive. The device also includes a second antenna configured to emit at least one second signal, each second signal either being an emitted jamming signal, or an emitted spoofing signal and having a jamming or spoofing frequency spectrum including at least one of the first frequencies.

Abstract: 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.

Abstract: The present invention relates to a device for eliminating the perturbation signals received by a reference GNSS station. The device has means for receiving a signal of interest that is transmitted via a satellite. It likewise has means for receiving the perturbation signals, said means including means for receiving said perturbation signals that are isolated from the signal of interest. It also has means for subtracting the perturbation signals from the signal of interest, said means including means for estimating the differential transfer function W between the reception channel for the signal of interest and the reception channel for the perturbation signals, so as to perform coherent subtraction of said signals.

Abstract: Method for locating sources interfering with a satellite-based radionavigation signal comprising the following steps: a step of calculating the intercorrelation matrix Rxx of the signals received by the elementary antennas of the said array, a step of determining a plurality of pointing vectors Ss whose components are the antenna gains, in a given direction of pointing {right arrow over (u)}s, of each elementary antenna of the said array, a step of calculating, for each assumption of direction of pointing {right arrow over (u)}s, the power of the signal received in this direction by the array of antennas, a step of searching for maxima among the set of powers Psf calculated and of locating interfering sources in the directions of pointing {right arrow over (u)}s corresponding to the said maxima, an ambiguity resolution step consisting in eliminating, from the search step, the maxima relating to an ambiguity resulting from the geometry of the array.

Abstract: A multifrequency receiver comprises a first receiving subsystem comprising: means for receiving at least a first and a second distinct frequency at least one of which comprises a signal containing information relating to the position of a satellite, the said receiving means comprising: a first amplification stage delivering a first filtered signal based on the signal received by the receiver; a second stage for processing each of the received frequencies; a third stage comprising a mixer and at least one local oscillator; and a fourth amplification and filtering stage making it possible to amplify the filtered signal at the output of the mixer. The second stage comprises: a first switch; means for amplifying the signals of the two channels; and a second switch making it possible to deliver the signal to the third stage.

Abstract: 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 (4d), at the level of the outputs of the processing chains (2a to 2g), is performed before the spatial filtering (3). The automatic equalization reduces disparities, innate or originate from drifts over time, between processing chains (2a to 2g), and uses a local test signal generator (5).

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to the antigarbling, in reception, of a broadband radio signal by a spatial filtering taking account of various garbled versions of the signal that are delivered by parallel processing chains assumed to have the same transfer function, such as for example, the individual processing chains associated with the radiating elements of an array antenna for receiving signals from GPS navigation satellites. It consists in carrying out, at the level of the outputs of the processing chains (2a to 2g), before the degarbling spatial filtering (3), an automatic equalization (4d) reducing the disparities between processing chains (2a to 2g), whether these disparities are innate or originate from drifts over time, this automatic equalization being accomplished by means of a local test signal generator (5).