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Emanuel Levinson - One of the best experts on this subject based on the ideXlab platform.
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The AN/WSN-7B Marine Gyrocompass/Navigator
2000Co-Authors: Terry Tucker, Emanuel LevinsonAbstract:Litton Marine Systems has developed a marine Gyrocompass/navigator for the U.S. Navy which has been designated the AN/WSN-7B. It is a more reliable state-of-the-art strapdown, ring-laser gyro, based replacement for the WSN-2 Gyrocompass, with the added requirement of being an inertial navigator with an accuracy of 1 nm in 24 hours. This paper provides a detailed description of the AN/WSN-7B, delineates the key features, and presents the latest laboratory and at-sea test results. These results show that the 1 nm in 24 hours navigation requirement as well as the velocity and attitude specifications are satisfied.
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the an wsn 7b marine Gyrocompass navigator
Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, 2000Co-Authors: Terry Tucker, Emanuel LevinsonAbstract:Litton Marine Systems has developed a marine Gyrocompass/navigator for the U.S. Navy which has been designated the AN/WSN-7B. It is a more reliable state-of-the-art strapdown, ring-laser gyro, based replacement for the WSN-2 Gyrocompass, with the added requirement of being an inertial navigator with an accuracy of 1 nm in 24 hours. This paper provides a detailed description of the AN/WSN-7B, delineates the key features, and presents the latest laboratory and at-sea test results. These results show that the 1 nm in 24 hours navigation requirement as well as the velocity and attitude specifications are satisfied.
Castellón Arturo - One of the best experts on this subject based on the ideXlab platform.
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Estimación del error de la giroscópica dependiente del rumbo mediante el uso del sistema GPS 3DF: Impacto en las medidas de ADCP
'Editorial CSIC', 2002Co-Authors: Ruiz Simón, Font Jordi, Griffiths Gwyn, Castellón ArturoAbstract:Traditionally the horizontal orientation in a ship (heading) has been obtained from a Gyrocompass. This instrument is still used on research vessels but has an estimated error of about 2-3 degrees, inducing a systematic error in the cross-track velocity measured by an Acoustic Doppler Current Profiler (ADCP). The three-dimensional positioning system (GPS 3DF) provides an independent heading measurement with accuracy better than 0.1 degree. The Spanish research vessel BIO Hespérides has been operating with this new system since 1996. For the first time on this vessel, the data from this new instrument are used to estimate Gyrocompass error. The methodology we use follows the scheme developed by Griffiths (1994), which compares data from the Gyrocompass and the GPS system in order to obtain an interpolated error function. In the present work we apply this methodology on mesoscale surveys performed during the observational phase of the OMEGA project, in the Alboran Sea. The heading-dependent Gyrocompass error dominated. Errors in Gyrocompass heading of 1.4-3.4 degrees have been found, which give a maximum error in measured cross-track ADCP velocity of 24 cm s-1.Tradicionalmente, la orientación horizontal (heading) de los barcos se ha obtenido a partir de una giroscópica. Este instrumento todavía es utilizado en los barcos de investigación, pero tiene un error asociado de entre 2 y 3 grados, provocando un error sistemático en la velocidad medida por el perfilador de corriente por efecto Doppler (ADCP) perpendicular a la trayectoria del barco. El sistema de posicionamiento tridimensional GPS 3DF permite obtener medidas independientes del heading con una precisión mayor de 0.1 grados. El BIO Hespérides dispone de este nuevo sistema desde 1996. Por primera vez en este barco, los datos de este nuevo instrumento se han utilizado para estimar el error de la giroscópica. La metodología usada está basada en el método de Griffiths (1994), el cuál compara datos del sistema GPS y de la giroscópica a fin de obtener una función representativa del error. En este trabajo aplicamos dicha metodología a una campaña realizada en el mar de Alborán, durante la fase observacional del proyecto OMEGA. El error de la giroscópica dependiente del rumbo dominó. Se detectaron errores comprendidos entre 1.4 y 3.4 grados, que producen un error máximo de 24 cm s1s-1, en la componente de la velocidad medida por el ADCP perpendicular a la trayectoria del barco
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Estimación del error de la giroscópica dependiente del rumbo mediane el uso del sistema GPS 3DF: impacto en las medidas de ADCP
'Editorial CSIC', 2002Co-Authors: Ruiz Simón, Font Jordi, Griffiths Gwyn, Castellón ArturoAbstract:[EN] Traditionally the horizontal orientation in a ship (heading) has been obtained from a Gyrocompass. This instrument is still used on research vessels but has an estimated error of about 2-3 degrees, inducing a systematic error in the cross-track velocity measured by an Acoustic Doppler Current Profiler (ADCP). The three-dimensional positioning system (GPS 3DF) provides an independent heading measurement with accuracy better than 0.1 degree. The Spanish research vessel BIO Hespérides has been operating with this new system since 1996. For the first time on this vessel, the data from this new instrument are used to estimate Gyrocompass error. The methodology we use follows the scheme developed by Griffiths (1994), which compares data from the Gyrocompass and the GPS system in order to obtain an interpolated error function. In the present work we apply this methodology on mesoscale surveys performed during the observational phase of the OMEGA project, in the Alboran Sea. The heading-dependent Gyrocompass error dominated. Errors in Gyrocompass heading of 1.4-3.4 degrees have been found, which give a maximum error in measured cross-track ADCP velocity of 24 cm s-1[ES] Tradicionalmente, la orientación horizontal (heading) de los barcos se ha obtenido a partir de una giroscópica. Este instrumento todavía es utilizado en los barcos de investigación, pero tiene un error asociado de entre 2 y 3 grados, provocando un error sistemático en la velocidad medida por el perfilador de corriente por efecto Doppler (ADCP) perpendicular a la trayectoria del barco. El sistema de posicionamiento tridimensional GPS 3DF permite obtener medidas independientes del heading con una precisión mayor de 0.1 grados. El BIO Hespérides dispone de este nuevo sistema desde 1996. Por primera vez en este barco, los datos de este nuevo instrumento se han utilizado para estimar el error de la giroscópica. La metodología usada está basada en el método de Griffiths (1994), el cuál compara datos del sistema GPS y de la giroscópica a fin de obtener una función representativa del error. En este trabajo aplicamos dicha metodología a una campaña realizada en el mar de Alborán, durante la fase observacional del proyecto OMEGA. El error de la giroscópica dependiente del rumbo dominó. Se detectaron errores comprendidos entre 1.4 y 3.4 grados, que producen un error máximo de 24 cm s -1, en la componente de la velocidad medida por el ADCP perpendicular a la trayectoria del barcoWe wish to express our gratitude to all scientists and technical staff who participated in the OMEGA- 1 cruise in the Western Alboran sea, as well as to the BIO Hespérides crew. OMEGA was a project of the Marine Science and Technology (MAST) Programme of the European Commission funded under contract MAS3-CT95-0001. OMEGA-1 was partially funded by the Spanish R+D National Plan (grant AMB95-0901). Special thanks to Pablo Rodríguez for the technical information about the GPS 3DF systemPeer reviewe
Terry Tucker - One of the best experts on this subject based on the ideXlab platform.
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The AN/WSN-7B Marine Gyrocompass/Navigator
2000Co-Authors: Terry Tucker, Emanuel LevinsonAbstract:Litton Marine Systems has developed a marine Gyrocompass/navigator for the U.S. Navy which has been designated the AN/WSN-7B. It is a more reliable state-of-the-art strapdown, ring-laser gyro, based replacement for the WSN-2 Gyrocompass, with the added requirement of being an inertial navigator with an accuracy of 1 nm in 24 hours. This paper provides a detailed description of the AN/WSN-7B, delineates the key features, and presents the latest laboratory and at-sea test results. These results show that the 1 nm in 24 hours navigation requirement as well as the velocity and attitude specifications are satisfied.
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the an wsn 7b marine Gyrocompass navigator
Proceedings of the 2000 National Technical Meeting of The Institute of Navigation, 2000Co-Authors: Terry Tucker, Emanuel LevinsonAbstract:Litton Marine Systems has developed a marine Gyrocompass/navigator for the U.S. Navy which has been designated the AN/WSN-7B. It is a more reliable state-of-the-art strapdown, ring-laser gyro, based replacement for the WSN-2 Gyrocompass, with the added requirement of being an inertial navigator with an accuracy of 1 nm in 24 hours. This paper provides a detailed description of the AN/WSN-7B, delineates the key features, and presents the latest laboratory and at-sea test results. These results show that the 1 nm in 24 hours navigation requirement as well as the velocity and attitude specifications are satisfied.
Yueyang Ben - One of the best experts on this subject based on the ideXlab platform.
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A novel EM-Log aided Gyrocompass alignment for in-motion marine SINS
Optik, 2015Co-Authors: Feng Sun, Jianzhong Xia, Yueyang Ben, Yue ZuAbstract:An EM-Log (Electromagnetic Log) aided in-motion Gyrocompass alignment algorithm is proposed to accomplish the fine alignment for marine SINS (strapdown inertial navigation system) on sailing vessel. The EM-Log is used to track the maneuver velocity of the vessel and remove the earth rotation angular velocity and the angular velocity of the navigation frame relative to the earth frame from accelerometer measurements. In terms of SINS damping technology, we change the structure of Gyrocompass alignment loop and employ EM-Log measurements to reduce the negative effects of vessel accelerations. The simulation and experiment results show that our proposed method could accomplish fine alignment of in-motion marine SINS, while the conventional one failed.
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Time-varying Gyrocompass alignment for fiber-optic-gyro inertial navigation system with large misalignment angle
Optical Engineering, 2014Co-Authors: Yueyang Ben, Yi Zhang, Liang HuoAbstract:Abstract. ConventionalstrapdownGyrocompassalignmentmethodsarebasedontheassumptionthatthefiber-optic-gyro inertial navigation system has a small azimuth misalignment angle. A large azimuth misalignmentangle would lead to an extension of the alignment duration. A time-varying Gyrocompass alignment methodto solve this problem is provided. An appropriate parameter setting is given for the Gyrocompass alignmentwith a large misalignment angle. Also, a proper protocol for a parametric switch is derived. Simulation andtrail results show that the proposed method has better alignment performance than conventional ones, asthe system has large misalignment angles. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE) [DOI: 10.1117/1.OE.53.9.095103] Keywords: fiber-optic-gyro; inertial navigation system; Gyrocompass; alignment.Paper 140457 receivedMar. 21, 2014; revised manuscript received Aug. 14, 2014; accepted for publication Aug. 15, 2014; publishedonline Sep. 11, 2014. 1 IntroductionThe fiber-optic-gyro (FOG) inertial navigation system (INS)features the benefits of fiber-optic-gyro technology andtherefore shares the advantage of requiring no maintenanceand recalibration. It belongs to strapdown INS and has sub-stituted for platform INS. The initial alignment is one of thekey technologies of FOG INS, as alignment accuracy andspeed directly affect the performance of FOG INS. Inmany applications, we need to accomplish the initial align-ment with high accuracy and rapid speed.TheclassicalGyrocompassalignmentmethodproposedinRef. 1 based on theGyrocompass effect and feedback controltheories was originally used in the platform INS, and thenwas applied in the FOG INS
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Strapdown fiber optic Gyrocompass using adaptive network-based fuzzy inference system
Optical Engineering, 2014Co-Authors: Yueyang Ben, Feng SunAbstract:This paper aims to propose a new strapdown fiber optic Gyrocompass (strapdown FOGC) using adaptive network-based fuzzy inference system (ANFIS). The strapdown FOGC is based on the principle of strapdown inertial navigation system and utilizes electromagnetic log (EM log) and damping equalizer to bound oscillatory errors existing in attitude and heading. As the introduction of damping technique, extra errors are aroused by EM log errors. To decrease the extra errors, ANFIS is utilized to adjust the damping ratio automatically in terms of the ship maneuver conditions. The simulation and trial results indicate that, compared with the conventional Gyrocompass scheme, the proposed one can reduce the attitude and heading errors and improve the system performance effectively.
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Time-varying parameters based Gyrocompass Alignment for marine SINS with large heading misalignment
2014 IEEE ION Position Location and Navigation Symposium - PLANS 2014, 2014Co-Authors: Feng Sun, Jianzhong Xia, Yueyang Ben, Haiyu LanAbstract:Gyrocompass alignment algorithm is a fine alignment technique based on Gyrocompass effect and loop feedback control theory. Conventional strapdown Gyrocompass alignment methods are based on the assumption that the system has a small heading misalignment angle. However, a large heading misalignment angle would exist during the alignment duration under some conditions, especially for marine strapdown inertial navigation system (SINS). This paper proposed a time-varying parameters based Gyrocompass alignment method to solve this problem. Error model of Gyrocompass alignment with large heading misalignment error is presented and an appropriate multi-parameter setting is given, a proper scenario for parametric switch is also derived. Simulation and experimental results show that the proposed method has better alignment performance than conventional ones when the system has a large heading misalignment angle.
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A novel algorithm for marine strapdown Gyrocompass based on digital filter
Measurement, 2013Co-Authors: Yueyang Ben, Feng SunAbstract:Abstract With the rapid development of strapdown Gyrocompass, few corresponding strapdown algorithms occur in publications, so that we have to use the conventional one designed for platform Gyrocompass. Enlightened by IXSEA ideals, we proposed a novel algorithm which is suitable for marine strapdown Gyrocompass. In our proposed algorithm, gyro outputs are used to track the body frame rotation, and the observation of the pure gravity slow drift in the inertial gives the navigation frame rotation. We also separate the pure gravity from interferential accelerations with a FIR low-pass digital filter. The analysis and numerical results show the better performance of the proposed algorithm than the conventional one.
Feng Sun - One of the best experts on this subject based on the ideXlab platform.
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A novel EM-Log aided Gyrocompass alignment for in-motion marine SINS
Optik, 2015Co-Authors: Feng Sun, Jianzhong Xia, Yueyang Ben, Yue ZuAbstract:An EM-Log (Electromagnetic Log) aided in-motion Gyrocompass alignment algorithm is proposed to accomplish the fine alignment for marine SINS (strapdown inertial navigation system) on sailing vessel. The EM-Log is used to track the maneuver velocity of the vessel and remove the earth rotation angular velocity and the angular velocity of the navigation frame relative to the earth frame from accelerometer measurements. In terms of SINS damping technology, we change the structure of Gyrocompass alignment loop and employ EM-Log measurements to reduce the negative effects of vessel accelerations. The simulation and experiment results show that our proposed method could accomplish fine alignment of in-motion marine SINS, while the conventional one failed.
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Strapdown fiber optic Gyrocompass using adaptive network-based fuzzy inference system
Optical Engineering, 2014Co-Authors: Yueyang Ben, Feng SunAbstract:This paper aims to propose a new strapdown fiber optic Gyrocompass (strapdown FOGC) using adaptive network-based fuzzy inference system (ANFIS). The strapdown FOGC is based on the principle of strapdown inertial navigation system and utilizes electromagnetic log (EM log) and damping equalizer to bound oscillatory errors existing in attitude and heading. As the introduction of damping technique, extra errors are aroused by EM log errors. To decrease the extra errors, ANFIS is utilized to adjust the damping ratio automatically in terms of the ship maneuver conditions. The simulation and trial results indicate that, compared with the conventional Gyrocompass scheme, the proposed one can reduce the attitude and heading errors and improve the system performance effectively.
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Time-varying parameters based Gyrocompass Alignment for marine SINS with large heading misalignment
2014 IEEE ION Position Location and Navigation Symposium - PLANS 2014, 2014Co-Authors: Feng Sun, Jianzhong Xia, Yueyang Ben, Haiyu LanAbstract:Gyrocompass alignment algorithm is a fine alignment technique based on Gyrocompass effect and loop feedback control theory. Conventional strapdown Gyrocompass alignment methods are based on the assumption that the system has a small heading misalignment angle. However, a large heading misalignment angle would exist during the alignment duration under some conditions, especially for marine strapdown inertial navigation system (SINS). This paper proposed a time-varying parameters based Gyrocompass alignment method to solve this problem. Error model of Gyrocompass alignment with large heading misalignment error is presented and an appropriate multi-parameter setting is given, a proper scenario for parametric switch is also derived. Simulation and experimental results show that the proposed method has better alignment performance than conventional ones when the system has a large heading misalignment angle.
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A novel algorithm for marine strapdown Gyrocompass based on digital filter
Measurement, 2013Co-Authors: Yueyang Ben, Feng SunAbstract:Abstract With the rapid development of strapdown Gyrocompass, few corresponding strapdown algorithms occur in publications, so that we have to use the conventional one designed for platform Gyrocompass. Enlightened by IXSEA ideals, we proposed a novel algorithm which is suitable for marine strapdown Gyrocompass. In our proposed algorithm, gyro outputs are used to track the body frame rotation, and the observation of the pure gravity slow drift in the inertial gives the navigation frame rotation. We also separate the pure gravity from interferential accelerations with a FIR low-pass digital filter. The analysis and numerical results show the better performance of the proposed algorithm than the conventional one.