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1. 发明专利

JP2000028702A METHOD AND APPARATUS FOR CALIBRATION OF DIGITAL DOWN CONVERTER IN SIGNAL PROCESSING SYSTEM 失效
公开(公告)号：JP2000028702A
公开(公告)日：2000-01-28
申请号：JP3347999
申请日：1999-02-10
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01S7/526 , G01D18/00 , G01J1/04 , G01J1/42 , G01J4/00 , G01J5/08 , G01L27/00 , G01V1/16 , G01V1/28 , G01V1/36 , G01V8/24 , G02F1/125 , G08C20060101 , G08C23/04 , H03D3/00 , H03D7/00 , H04B20060101 , H04B7/10 , H04B10/12 , H04B10/148 , H04B13/00 , H04J1/05
摘要： PROBLEM TO BE SOLVED: To enable to use with an array of optical fiber interference sensors by determining an optimal offset value of an in-phase component on the in-phase component signal of a selected digital down converter. SOLUTION: The inboard receiver 102 of a submarine system 100 is connected to the electric power system of a submarine via electric power connection 106. An input light signal 118 is created by a laser module 116. Then the first channel from each sensor array is multiplexed via a signal multiplexer 121 and is processed by a receiver card 122. A frequency synthesizer 142 controls the operation of the laser module 116, and timing information is supplied for the receiver card via a circuit 144. Memory 140 related to a CPU 130 supplies system level control and condition information for other constituent elements of the receiver 102 via data circuits 132, 134, and 138. In addition, the CPU 130 controls comprehensive calibration processing procedure for the laser module.

2. 发明专利

JP2000028429A METHOD AND APPARATUS FOR INTERROGATION OF OPTICAL FIBER INTERFEROMETRIC SENSOR IN MULTICHANNEL APPLICATION 失效
公开(公告)号：JP2000028429A
公开(公告)日：2000-01-28
申请号：JP3348199
申请日：1999-02-10
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01H9/00
摘要： PROBLEM TO BE SOLVED: To provide a technology for interrogation of optical fiber interferometric sensors. SOLUTION: Optical signals are multiplexed with signals (channel) modulated by means of an optical fiber sensor row 104 in accordance with the pressure of acoustic waves and inputted to a polarization diversity detector having two or more outputs. A plurality of digital down converters separate different channels from each other, demodulate the signals, and output in-phase data and orthogonal-phase data to each signal channel. A system controller connects the digital down converters to a calibrating digital down converter. The calibrating digital down converter is controlled by means of the system controller and successively imitates the operations of each digital down converter in order to decide the optimum digital down converter setting of each digital down converter.

3. 发明专利

NO990612L 未知
公开(公告)号：NO990612L
公开(公告)日：1999-08-11
申请号：NO990612
申请日：1999-02-09
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01H9/00 , G08C15/00
摘要： A technique for interrogation of fiber optic interferometric sensors (104) wherein an optical signal is modulated by an array of fiber optic sensors in response to acoustic pressure. Modulated signals (channels) from each sensor are multiplexed onto a single fiber optic cable and the multiplexed signal is input to a polarization diversity detector having at least two outputs. The optical signal is converted into a digital, electrical signal. A plurality of digital down converters (228) demultiplex and demodulate the separate channels and output in-phase data and quadrature phase data for each of the signal channels. A system controller (226) connects to the digital down converters (228) and to a calibration digital down converter. The calibration digital down converter, controlled by the system controller, mimics an operation of each digital down converter in turn in order to determine optimal digital down converter settings for each digital down converter. The system controller updates the optimal settings for each digital down converter such that the digital down converters are dynamically calibrated according to the optimal settings. The in-phase and quadrature phase data output of the digital down converters are then processed with an acoustic signal processor.

4. 发明专利

DE69932271T2 未知
公开(公告)号：DE69932271T2
公开(公告)日：2006-11-30
申请号：DE69932271
申请日：1999-02-10
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , FERRARO EUGENE L , HERSHMAN LAWRENCE J
IPC分类号： G01S7/526 , H04J1/05 , G01D18/00 , G01J1/04 , G01J1/42 , G01J4/00 , G01J5/08 , G01L27/00 , G01V1/16 , G01V1/28 , G01V1/36 , G01V8/24 , G02F1/125 , G08C20060101 , G08C23/04 , H03D3/00 , H03D7/00 , H04B20060101 , H04B7/10 , H04B10/12 , H04B10/148 , H04B13/00
摘要： A calibration technique for digital down converters in a signal processing system, wherein a digital down converter is selected by a system controller for calibration. The digital down converter's settings are copied into a calibration digital down converter which mimics the operation of the selected digital down converter. A best polarization diversity detector signal path, an optimal phase offset value for an in-phase data signal, an optimal phase offset value for a quadrature phase data signal, and a normalized gain value for the in-phase and quadrature phase signals of the selected digital down converter are determined. The system controller updates the selected digital down converter with the determined optimal settings. This procedure is repeated for each digital down converter in the signal processing system, while the signal processing occurs simultaneously.

5. 发明专利

AU746168B2 Method and apparatus for interrogation of fiber optic interferometric sensors in multi-channel applications 未知
公开(公告)号：AU746168B2
公开(公告)日：2002-04-18
申请号：AU1636699
申请日：1999-02-09
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01H9/00 , G01V1/16 , G01V1/28 , G02F1/125 , H03D3/00 , H03D7/00
摘要： A technique for interrogation of fiber optic interferometric sensors (104) wherein an optical signal is modulated by an array of fiber optic sensors in response to acoustic pressure. Modulated signals (channels) from each sensor are multiplexed onto a single fiber optic cable and the multiplexed signal is input to a polarization diversity detector having at least two outputs. The optical signal is converted into a digital, electrical signal. A plurality of digital down converters (228) demultiplex and demodulate the separate channels and output in-phase data and quadrature phase data for each of the signal channels. A system controller (226) connects to the digital down converters (228) and to a calibration digital down converter. The calibration digital down converter, controlled by the system controller, mimics an operation of each digital down converter in turn in order to determine optimal digital down converter settings for each digital down converter. The system controller updates the optimal settings for each digital down converter such that the digital down converters are dynamically calibrated according to the optimal settings. The in-phase and quadrature phase data output of the digital down converters are then processed with an acoustic signal processor.

6. 发明专利

NO990610A 未知
公开(公告)号：NO990610A
公开(公告)日：1999-08-11
申请号：NO990610
申请日：1999-02-09
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01S7/526 , G08C23/04 , G01D18/00 , G01J1/04 , G01J1/42 , G01J4/00 , G01J5/08 , G01L27/00 , G01V1/16 , G01V1/28 , G01V1/36 , G01V8/24 , G02F1/125 , G08C20060101 , H03D3/00 , H03D7/00 , H04B20060101 , H04B7/10 , H04B10/12 , H04B10/148 , H04B13/00 , H04J1/05
CPC分类号： G01S3/82 , H04L27/0014 , H04L2027/0024

7. 发明专利

NO990610L 未知
公开(公告)号：NO990610L
公开(公告)日：1999-08-11
申请号：NO990610
申请日：1999-02-09
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01D18/00 , G01S7/526 , G01J1/04 , G08C23/04 , G01J1/42 , G01J4/00 , G01J5/08 , G01L27/00 , G01V1/16 , G01V1/28 , G01V1/36 , G01V8/24 , G02F1/125 , G08C20060101 , H03D3/00 , H03D7/00 , H04B20060101 , H04B7/10 , H04B10/12 , H04B10/148 , H04B13/00 , H04J1/05
摘要： A calibration technique for digital down converters in a signal processing system, wherein a digital down converter is selected by a system controller for calibration. The digital down converter's settings are copied into a calibration digital down converter which mimics the operation of the selected digital down converter. A best polarization diversity detector signal path, an optimal phase offset value for an in-phase data signal, an optimal phase offset value for a quadrature phase data signal, and a normalized gain value for the in-phase and quadrature phase signals of the selected digital down converter are determined. The system controller updates the selected digital down converter with the determined optimal settings. This procedure is repeated for each digital down converter in the signal processing system, while the signal processing occurs simultaneously.

8. 发明专利

DE69932271D1 未知
公开(公告)号：DE69932271D1
公开(公告)日：2006-08-24
申请号：DE69932271
申请日：1999-02-10
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , FERRARO EUGENE L , HERSHMAN LAWRENCE J
IPC分类号： G01S7/526 , H04J1/05 , G01D18/00 , G01J1/04 , G01J1/42 , G01J4/00 , G01J5/08 , G01L27/00 , G01V1/16 , G01V1/28 , G01V1/36 , G01V8/24 , G02F1/125 , G08C20060101 , G08C23/04 , H03D3/00 , H03D7/00 , H04B20060101 , H04B7/10 , H04B10/12 , H04B10/148 , H04B13/00
摘要： A calibration technique for digital down converters in a signal processing system, wherein a digital down converter is selected by a system controller for calibration. The digital down converter's settings are copied into a calibration digital down converter which mimics the operation of the selected digital down converter. A best polarization diversity detector signal path, an optimal phase offset value for an in-phase data signal, an optimal phase offset value for a quadrature phase data signal, and a normalized gain value for the in-phase and quadrature phase signals of the selected digital down converter are determined. The system controller updates the selected digital down converter with the determined optimal settings. This procedure is repeated for each digital down converter in the signal processing system, while the signal processing occurs simultaneously.

9. 发明专利

DE69916677D1 未知
公开(公告)号：DE69916677D1
公开(公告)日：2004-06-03
申请号：DE69916677
申请日：1999-02-10
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , FERRARO EUGENE L , HERSHMAN LAWRENCE J
IPC分类号： G01H9/00 , G01D5/353
摘要： A technique for interrogation of fiber optic interferometric sensors (104) wherein an optical signal is modulated by an array of fiber optic sensors in response to acoustic pressure. Modulated signals (channels) from each sensor are multiplexed onto a single fiber optic cable and the multiplexed signal is input to a polarization diversity detector having at least two outputs. The optical signal is converted into a digital, electrical signal. A plurality of digital down converters (228) demultiplex and demodulate the separate channels and output in-phase data and quadrature phase data for each of the signal channels. A system controller (226) connects to the digital down converters (228) and to a calibration digital down converter. The calibration digital down converter, controlled by the system controller, mimics an operation of each digital down converter in turn in order to determine optimal digital down converter settings for each digital down converter. The system controller updates the optimal settings for each digital down converter such that the digital down converters are dynamically calibrated according to the optimal settings. The in-phase and quadrature phase data output of the digital down converters are then processed with an acoustic signal processor.

10. 发明专利

NO990612A 未知
公开(公告)号：NO990612A
公开(公告)日：1999-08-11
申请号：NO990612
申请日：1999-02-09
申请人： LITTON SYSTEMS INC
发明人： GREEN JAMES D , HERSHMAN LAWRENCE J , FERRARO EUGENE L
IPC分类号： G01H9/00 , G08C15/00
CPC分类号： G01H9/004

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