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1. 发明申请

WO1987003757A1 ENHANCED QUADRATURE NOTCH FILTER 审中-公开
标题翻译：增强型过滤器
公开(公告)号：WO1987003757A1
公开(公告)日：1987-06-18
申请号：PCT/US1986002501
申请日：1986-11-17
申请人： HUGHES AIRCRAFT COMPANY
发明人： HUGHES AIRCRAFT COMPANY , JENSEN, Preben, B.
IPC分类号： H03H19/00
CPC分类号： H03H19/00
摘要： An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter (16') for producing first and second reference signals which have substantially the same frequency as the undesired signal component but which are 90o out of phase with each other, a pair of amplitude control loops (18', 20') for adding the first and second reference signals to the input signal in amplitudes which will cancel the undesired signal component, and a phase locked loop (36) circuit for maintaining a predetermined phase relationship between the undesired signal component and and one of the first and second reference signals.

2. 发明申请

WO1989005983A1 CHIRPED BACKSCATTER FILTER 审中-公开
公开(公告)号：WO1989005983A1
公开(公告)日：1989-06-29
申请号：PCT/US1988004034
申请日：1988-11-14
申请人： HUGHES AIRCRAFT COMPANY
发明人： HUGHES AIRCRAFT COMPANY , JENSEN, Preben, B. , ARNN, Edward, L.
IPC分类号： G01S07/28
CPC分类号： H03H19/00 , G01S7/4912 , G01S7/493
摘要： A chirped backscatter filter (10) compares a received signal (RSIG) to a reference signal related to a transmitted signal (TSIG) and removes from RSIG the frequency component which is equal to TSIG in frequency. This removed frequency component corresponds to the frequency of the transmitter backscatter radiation. The filter of the invention adds a frequency offset (fn) to both RSIG and TSIG in mixers (12 and 14) before subtracting one from the other in mixer (22). Thus, equal frequency components in both RSIG and TSIG, such as the backscatter radiation frequency component of RSIG, will equal fn. The frequencies resulting from this subtraction are thereafter passed through a notch filter (24) which is centered on fn and which passes all frequency components except fn. The output of the notch filter thus no longer has a frequency component associated with the backscatter frequency component. The loss of the RSIG phase reference due to the phase reference between the RSIG and TSIG modulation envelopes being destroyed during the backscatter filtering process is thereafter compensated for by adding TSIG to the filtered difference frequency component, thereby reestablishing the phase relationship of the original RSIG frequency components minus the backscatter frequency component.

3. 发明公开

EP0345346A1 CHIRPED BACKSCATTER FILTER 失效
标题翻译：过滤器可变速率恢复蔓延。
公开(公告)号：EP0345346A1
公开(公告)日：1989-12-13
申请号：EP89902358.0
申请日：1988-11-14
申请人： Hughes Aircraft Company
发明人： JENSEN, Preben, B. , ARNN, Edward, L.
IPC分类号： G01S7 , G01S13 , H03H19
CPC分类号： H03H19/00 , G01S7/4912 , G01S7/493
摘要： Un filtre de rétrodiffusion "chirp" (10) compare un signal reçu (RSIG) à un signal de référence relatif à un signal transmis (TSIG) et élimine du RSIG la composante de fréquence qui est égale à TSIG en fréquence. Cette composante de fréquence extraite correspond à la fréquence du rayonnement de rétrodiffusion de l'émetteur. Le filtre de l'invention ajoute un décalage de fréquence (fn) au RSIG et au TSIG dans les mélangeurs (12 et 14) avant de soustraire l'un de l'autre dans le mélangeur (22). Ainsi, des composantes de fréquence égales dans RSIG et dans TSIG, telles que la composante de fréquence du rayonnement de rétrodiffusion de RSIG, seront égales à fn. Les fréquences résultant de cette soustraction passent ensuite par un filtre à coupe-bande (24) qui est centré sur fn et qui fait passer toutes les composantes de fréquence à l'exception de fn. La sortie du filtre coupe-bande n'a donc plus de composantes de fréquence associées à la composante de fréquence de rétrodiffusion. La perte de la référence de phase RSIG due à la référence de phase entre les enveloppes de modulaton RSIG et TSIG détruites pendant le procédé de filtration de rétrodiffusion est compensée en ajoutant TSIG à la composante de fréquence de différence filtrée, rétablissant ainsi la relation de phase des composantes de fréquence RSIG originales moins la composante de fréquence de rétrodiffusion.

4. 发明授权

EP0249623B1 ENHANCED QUADRATURE NOTCH FILTER 失效
标题翻译：增强型四边形过滤器
公开(公告)号：EP0249623B1
公开(公告)日：1991-12-27
申请号：EP87900394.5
申请日：1986-11-17
申请人： Hughes Aircraft Company
发明人： JENSEN, Preben, B.
IPC分类号： H03H19/00
CPC分类号： H03H19/00
摘要： An enhanced quadrature notch filter which is capable of rejecting an undesired signal component of an input signal, generally comprising a quadrature phase splitter (16') for producing first and second reference signals which have substantially the same frequency as the undesired signal component but which are 90o out of phase with each other, a pair of amplitude control loops (18', 20') for adding the first and second reference signals to the input signal in amplitudes which will cancel the undesired signal component, and a phase locked loop (36) circuit for maintaining a predetermined phase relationship between the undesired signal component and and one of the first and second reference signals.

5. 发明授权

EP0345346B1 CHIRPED BACKSCATTER FILTER 失效
标题翻译：过滤器可变速率恢复蔓延。
公开(公告)号：EP0345346B1
公开(公告)日：1993-10-27
申请号：EP89902358.4
申请日：1988-11-14
申请人： Hughes Aircraft Company
发明人： JENSEN, Preben, B. , ARNN, Edward, L.
IPC分类号： G01S7/28 , H03H19/00
CPC分类号： H03H19/00 , G01S7/4912 , G01S7/493
摘要： A chirped backscatter filter (10) compares a received signal (RSIG) to a reference signal related to a transmitted signal (TSIG) and removes from RSIG the frequency component which is equal to TSIG in frequency. This removed frequency component corresponds to the frequency of the transmitter backscatter radiation. The filter of the invention adds a frequency offset (fn) to both RSIG and TSIG in mixers (12 and 14) before subtracting one from the other in mixer (22). Thus, equal frequency components in both RSIG and TSIG, such as the backscatter radiation frequency component of RSIG, will equal fn. The frequencies resulting from this subtraction are thereafter passed through a notch filter (24) which is centered on fn and which passes all frequency components except fn. The output of the notch filter thus no longer has a frequency component associated with the backscatter frequency component. The loss of the RSIG phase reference due to the phase reference between the RSIG and TSIG modulation envelopes being destroyed during the backscatter filtering process is thereafter compensated for by adding TSIG to the filtered difference frequency component, thereby reestablishing the phase relationship of the original RSIG frequency components minus the backscatter frequency component.

6. 发明公开

EP0249623A1 ENHANCED QUADRATURE NOTCH FILTER 失效
标题翻译：磨边孔过滤器。
公开(公告)号：EP0249623A1
公开(公告)日：1987-12-23
申请号：EP87900394.0
申请日：1986-11-17
申请人： Hughes Aircraft Company
发明人： JENSEN, Preben, B.
IPC分类号： G01S7 , H03H11 , H03H19
CPC分类号： H03H19/00
摘要： Un filtre amélioré de réjection de signaux en quadrature, pouvant rejeter la composante de signal indésirée d'un signal d'entrée, comprend généralement un séparateur en quadrature de phase (16') destiné à produire un premier et un second signal de référence présentant substantiellement la même fréquence que la composante de signal indésirée, mais qui sont déphasés de 90o l'un par rapport à l'autre, une paire de boucles de commande d'amplitude (18', 20') destinées à ajouter le premier et le second signal de référence au signal d'entrée à des amplitudes qui permettent d'annuler la composante de signal indésirée, et un circuit en boucle à phase verrouillée (36) destiné à maintenir une relation de phase prédéterminée entre la composante de signal indésirée et le premier ou le second signal de référence.

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