Abstract: A method for processing a signal formed of a sequence of pulses, including at least one repetitive pattern formed of at least one pulse, the pattern being repeated in the signal with a pattern repetition period, the method including estimating the pattern repetition period of the signal and calculating, as a function of (i) an arrival date of each pulse with respect to a chosen reference arrival date, and (ii) the estimated pattern repetition period, a sequence of phases; thereafter, the method includes estimating, on the basis of the calculated sequence of phases, at least one phase value and an associated standard deviation, the phase value being associated with a phase moment representative of the repetitive pattern, and obtaining and utilizing parameters characterizing the digital signal by using the estimated phase values.

Abstract: A method and device for identifying radar emission modes are provided.

Abstract: A method using an array of ESM receivers comprises; a step of determining a first locus on the basis of a first measurement giving information on the angle difference of arrival of the emission beam on two receivers, the first locus including the points in space giving the same first measurement on the two receivers; a step of determining a second locus on the basis of a second measurement giving information on the direction of arrival on at least one receiver, the second locus including the points in space giving the same second measurement on the receiver; and a step of determining a third locus on which the position of the source is found, the third locus being the intersection of the first locus and of the second locus.

Abstract: A method of non-supervised deinterleaving of pulse trains comprises at least one N-dimensional enrichment step, N being an integer greater than 1.

Abstract: A method and device for identifying radar emission modes are provided.

Abstract: A method for processing a signal formed of a sequence of pulses, including at least one repetitive pattern formed of at least one pulse, the pattern being repeated in the signal with a pattern repetition period, the method including estimating the pattern repetition period of the signal and calculating, as a function of (i) an arrival date of each pulse with respect to a chosen reference arrival date, and (ii) the estimated pattern repetition period, a sequence of phases; thereafter, the method includes estimating, on the basis of the calculated sequence of phases, at least one phase value and an associated standard deviation, the phase value being associated with a phase moment representative of the repetitive pattern, and obtaining and utilizing parameters characterizing the digital signal by using the estimated phase values.

Abstract: A method for passively locating a non-movable transmitter on the ground implemented by a group of at least one receiving station, each of the receiving stations comprising a detector of radars and a time reference, the set of time references being mutually synchronized, the transmitter transmitting a set of periodic pulses, wherein a first estimation of the position of the transmitter is carried out by the Bancroft scheme on the basis of the mean arrival times of the pulses transmitted by the transmitter at the level of each station of the group of at least one receiving station, the result obtained being used thereafter as point for initializing a maximum likelihood scheme so as to converge toward the position of the transmitter.

Abstract: Disclosed is a method for deinterleaving radar signals, the method including: —the reception of electromagnetic signals by a receiver (12) and the extraction of the pulses from the received signals, and —the formation of pulse trains grouping together at least three pulses spaced apart by a same pulse repetition interval, each pulse train being defined by the pulse repetition interval. The method further includes: —the grouping together of the pulse trains having a same pulse repetition interval according to a predefined grouping law in order to form pulse plateaus, and —the association of the pulse plateaus according to at least one predefined association law in order to obtain deinterleaved radar signals formed from the concatenation of the pulse trains of the associated pulse plateaus.

Abstract: A method using an array of ESM receivers comprises; a step of determining a first locus on the basis of a first measurement giving information on the angle difference of arrival of the emission beam on two receivers, the first locus including the points in space giving the same first measurement on the two receivers; a step of determining a second locus on the basis of a second measurement giving information on the direction of arrival on at least one receiver, the second locus including the points in space giving the same second measurement on the receiver; and a step of determining a third locus on which the position of the source is found, the third locus being the intersection of the first locus and of the second locus.

Abstract: Disclosed is a method for deinterleaving radar signals, the method including: the reception of electromagnetic signals by a receiver (12) and the extraction of the pulses from the received signals, and the formation of pulse trains grouping together at least three pulses spaced apart by a same pulse repetition interval, each pulse train being defined by the pulse repetition interval. The method further includes: the grouping together of the pulse trains having a same pulse repetition interval according to a predefined grouping law in order to form pulse plateaus, and the association of the pulse plateaus according to at least one predefined association law in order to obtain deinterleaved radar signals formed from the concatenation of the pulse trains of the associated pulse plateaus.

Abstract: A method of passive location of radar transmitters implemented by at least two ESM stations, the radars having a quasi-constant scanning speed in the course of the transit over the set comprising at least two ESM stations, each of the ESM stations being able to intercept the transmission lobes of radar transmitters and to estimate their lobe transit times (LTT) and at least one station being able to estimate the angle of arrival ? of the transmission lobes, the location of the radar transmitters being performed by testing the intersection between an iso-LTTD curve passing through at least the two ESM stations and a sighting straight line passing through the ESM station having measured the angle of arrival and of azimuth equal to the measured angle of arrival ?.

Abstract: A method for passively locating a non-movable transmitter on the ground implemented by a group of at least one receiving station, each of the receiving stations comprising a detector of radars and a time reference, the set of time references being mutually synchronized, the transmitter transmitting a set of periodic pulses, wherein a first estimation of the position of the transmitter is carried out by the Bancroft scheme on the basis of the mean arrival times of the pulses transmitted by the transmitter at the level of each station of the group of at least one receiving station, the result obtained being used thereafter as point for initializing a maximum likelihood scheme so as to converge toward the position of the transmitter.

Abstract: A method of non-supervised deinterleaving of pulse trains comprises at least one N-dimensional enrichment step, N being an integer greater than 1.

Abstract: A method of passive location of radar transmitters implemented by at least two ESM stations, the radars having a quasi-constant scanning speed in the course of the transit over the set comprising at least two ESM stations, each of the ESM stations being able to intercept the transmission lobes of radar transmitters and to estimate their lobe transit times (LTT) and at least one station being able to estimate the angle of arrival ? of the transmission lobes, the location of the radar transmitters being performed by testing the intersection between an iso-LTTD curve passing through at least the two ESM stations and a sighting straight line passing through the ESM station having measured the angle of arrival and of azimuth equal to the measured angle of arrival ?.