公开(公告)号：EP0439539A1

公开(公告)日：1991-08-07

申请号：EP89912454

申请日：1989-10-20

Applicant: THOMSON CSF

Inventor： FOUCHE YVON ,  ELLEAUME PHILIPPE ,  DE COUASNON TRISTAN ,  TRAVERT SERGE ,  MONNIER RAOUL ,  HERGAULT STEPHANE

IPC: H04J7/00 ,  H04J11/00 ,  H04L7/00 ,  H04L27/22 ,  H04L27/26 ,  H04N5/44 ,  H04N7/08 ,  H04N7/24

CPC classification number: H04L27/2601 ,  H04N5/4401 ,  H04N7/08

Abstract: Un procédé d'émission d'ondes modulées utilisant simultanément une pluralité de fréquences comporte des étapes successives d'émission de symboles pendant une durée T + DELTAT, deux fréquences d'émission étant distantes de 1/T, T étant l'intervalle utile d'émission et DELTAT étant l'intervalle de transition. On émet des signaux de synchronisation permettant à la réception l'échantillonnage du signal pendant des intervalles utiles d'émission de durée T de façon à rendre orthogonaux des canaux correspondant aux diverses fréquences. L'invention s'applique à la diffusion et à la réception d'émissions radiophoniques et de télévision, aux dispositifs de réception d'informations analogiques et/ou numériques, aux communications téléphoniques entre centraux, aux communications téléphoniques entre radiotéléphones et stations de communications, aux communications radioélectriques entre stations terrestres et satellites, aux communications entre satellites, aux communications acoustiques dans l'air et/ou dans l'eau et à la réalisation de réseaux locaux d'ordinateurs. L'invention est particulièrement bien adaptée aux émissions radiophoniques haute-fidélité ainsi qu'à la télévision à haute définition (HDTV en terminologie anglo-saxonne), et/ou la télévision numérique.

公开(公告)号：FR2746506A1

公开(公告)日：1997-09-26

申请号：FR8401292

申请日：1984-01-27

Applicant: THOMSON CSF

Inventor： DESODT GUY ,  ELLEAUME PHILIPPE ,  SEGUIN DANIEL

IPC: G01S7/285 ,  G01S13/53 ,  G01S7/28

Abstract: The device comprises a bank of Doppler filters (5) which receive the output signals (am,p) from the receiver and generate the output data (Am,n) for each of the distance-speed cases. An electronic attenuator with a threshold (10) has a control input connected to a processing circuit (20). For each distance-speed case this circuit evaluates a control signal (Rs) representative of the ratio of the strongest level output data (AM,n) to the average value of the noise signal of the receiver. The threshold value of the electronic attenuator (10) is a function of the stability factor of the radar system. The processing circuit (20) providing the control signal (Rs) comprises a logical operator (21) which delivers a signal for each distance-speed case, and a summing circuit (22) which calculates the average value of the output data (Am, N/2) provided by the central element of the bank of Doppler filters, and a division circuit (23) whose inputs are connected to the logical operator (21) and the summing circuit (22).

公开(公告)号：FR2745390A1

公开(公告)日：1997-08-29

申请号：FR8401293

申请日：1984-01-27

Applicant: THOMSON CSF

Inventor： DESODT GUY ,  ELLEAUME PHILIPPE ,  SEGUIN DANIEL

IPC: G01S7/36 ,  G01S7/537

Abstract: The electronic counter measure device is connected to a radar receiver whose output signals (Am,n) are filtered in a bank of Doppler filters (5). These deliver output signals (Am,n) for each of the cases of distance/speed for the radar system. The device comprises circuits (6) allowing calculation of several quantities, including the average value of the level of noise signals of the receiver , the presence (B-C/D) of electronic counter measure signals cut in time, and the ratio (Rm) (for each of the distance/speed cases) of the maximum value to the average value of the output data (AM,n). A switching circuit (7) is sensitive to the presence signal (B-C/D) which provided an output signal (BM,n) in which, in place of the data (Amn,) is substituted the average value when the ratio (Rm) is less than a threshold value.

公开(公告)号：DE3526776C1

公开(公告)日：1995-12-21

申请号：DE3526776

申请日：1985-07-26

Applicant: THOMSON CSF

Inventor： SEGUIN DAVID ,  DESODT GUY ,  ELLEAUME PHILIPPE

IPC: G01S7/292 ,  G01S13/53 ,  G01S13/50 ,  G01S7/28

公开(公告)号：GB2285357A

公开(公告)日：1995-07-05

申请号：GB8513751

申请日：1985-05-31

Applicant: THOMSON CSF

Inventor： ELLEAUME PHILIPPE

IPC: G01S13/28 ,  G01S13/30 ,  G01S13/524 ,  G01S13/526 ,  G01S13/26 ,  G01S13/20

Abstract: A radar in which pulses are transmitted in bursts, having for each burst a given recurrence frequency fR and a given transmission frequency f, is characterized in that: each transmitted burst contains a first set of pulses having the same phase, and at least one other set of pulses for which each pulse has a phase proportional to the square of the position of the pulse in its set and in that: on reception (7), the inverse phase law (11) is applied, and then Doppler processing (12) is carried out in order to extract, when a target of trace p is detected, the Doppler frequencies resulting from the separate phase laws, on transmission, which cause the appearance of apparent Doppler frequencies corresponding to a translation (13) proportional to the number of the trace of the target of the Doppler frequency of that target.

公开(公告)号：DE3520310A1

公开(公告)日：1995-05-11

申请号：DE3520310

申请日：1985-06-07

Applicant: THOMSON CSF

Inventor： ELLEAUME PHILIPPE

IPC: G01S13/28 ,  G01S13/30 ,  G01S13/524 ,  G01S13/526 ,  G01S13/20

Abstract: In the case of the method for correcting range ambiguity, the pulses are transmitted in salvos. A given repetition frequency fR and a given transmission frequency f are used in each salvo. A phase law (3) is used at the transmission end (1) such that each salvo has a first part for which the phase is equal to a constant, and (k-1) parts (k being an integer) for which the phase is a square multiple of the sequence number of the pulse in the part under consideration. At the reception end (7), the inverse phase law (11) is used. Doppler processing (12) is subsequently carried out in order to obtain the track p (during the detection of a target) at those Doppler frequencies which result from the various phase laws in the transmission mode which cause the occurrence of apparent Doppler frequencies which correspond to a shift (13) which is proportional to the number of the track of the target at the Doppler frequency of this target. Use in radar systems having range ambiguity.

公开(公告)号：SG155194G

公开(公告)日：1995-03-17

申请号：SG155194

申请日：1994-10-21

Applicant: THOMSON CSF

Inventor： FOUCHE YVON ,  DESODT GUY ,  ELLEAUME PHILIPPE ,  AUVRAY GERARD ,  ANASTASSIADES JEAN

IPC: H04B7/005 ,  H04L27/00 ,  H04L27/18 ,  H04N7/24

公开(公告)号：DE68916970T2

公开(公告)日：1994-11-24

申请号：DE68916970

申请日：1989-10-20

Applicant: THOMSON CSF

Inventor： FOUCHE YVON ,  ELLEAUME PHILIPPE ,  DE COUASNON TRISTAN ,  TRAVERT SERGE ,  MONNIER RAOUL ,  HERGAULT STEPHANE

IPC: H04J7/00 ,  H04J11/00 ,  H04L7/00 ,  H04L27/22 ,  H04L27/26 ,  H04N5/44 ,  H04N7/08 ,  H04N7/24 ,  H04L5/02

Abstract: A method for transmitting modulated waves simultaneously using a plurality of frequencies comprises successive steps of transmission of symbols for a duration T + DELTA T, two transmission frequencies being separated by 1/T, T being the useful transmission interval and DELTA T being the transition interval. Synchronisation signals are transmitted enabling, on reception, the sampling of the signal for useful transmission intervals of duration T so as to render orthogonal channels corresponding to the various frequencies. The invention applies to the broadcasting and receiving of radio and television transmissions, to devices for receiving analog and/or digital information, to telephone communications between exchanges, to telephone communications between radio telephones and communication stations, to radio communications between terrestrial stations and satellites, to communications between satellites, to acoustic communications in air and/or in water, and to the construction of local computer networks. The invention is particularly well suited to high fidelity radio transmissions as well as to high definition television (HDTV) and/or digital television.

公开(公告)号：DE68916970D1

公开(公告)日：1994-08-25

申请号：DE68916970

申请日：1989-10-20

Applicant: THOMSON CSF

Inventor： FOUCHE YVON ,  ELLEAUME PHILIPPE ,  DE COUASNON TRISTAN ,  TRAVERT SERGE ,  MONNIER RAOUL ,  HERGAULT STEPHANE

IPC: H04J7/00 ,  H04J11/00 ,  H04L7/00 ,  H04L27/22 ,  H04L27/26 ,  H04N5/44 ,  H04N7/08 ,  H04N7/24 ,  H04L5/02

Abstract: A method for transmitting modulated waves simultaneously using a plurality of frequencies comprises successive steps of transmission of symbols for a duration T + DELTA T, two transmission frequencies being separated by 1/T, T being the useful transmission interval and DELTA T being the transition interval. Synchronisation signals are transmitted enabling, on reception, the sampling of the signal for useful transmission intervals of duration T so as to render orthogonal channels corresponding to the various frequencies. The invention applies to the broadcasting and receiving of radio and television transmissions, to devices for receiving analog and/or digital information, to telephone communications between exchanges, to telephone communications between radio telephones and communication stations, to radio communications between terrestrial stations and satellites, to communications between satellites, to acoustic communications in air and/or in water, and to the construction of local computer networks. The invention is particularly well suited to high fidelity radio transmissions as well as to high definition television (HDTV) and/or digital television.

公开(公告)号：CA1263756A

公开(公告)日：1989-12-05

申请号：CA520533

申请日：1986-10-15

Applicant: THOMSON CSF

Inventor： ELLEAUME PHILIPPE

IPC: G01S13/28 ,  G06F17/14 ,  G06T9/00 ,  G06F15/332

Abstract: L'invention a pour objet un dispositif de calcul d'une transformée de Fourier discrète, glissante et nonrécursive notamment applicable au traitement du signal d'un radar à compression d'impulsion. Ce dispositif comporte N étages analogues qui à partir d'échantillons du signal d'entrée, fournissent chacun un signal de la forme: (1) avec: (2) (3) et où k l'indice de l'étage (0 ? k ? N), m l'indice de la fenêtre et N le nombre d'échantillons dans la fenêtre, N étant un multiple de quatre. Les rotations complexes des expressions (1) et (3) sont chacune décomposées en une rotation dans le premier quadrant du plan complexe, rotation commune aux N étages, et un complément de rotation spécifique à chaque étage, réalisé par addition-soustraction.