In this work, an IOG is built using an integrated sensing coil produced from a 2.14-m-long SiO2 waveguide, the minimum bend radius and spacing of which are chosen . CGRP Registration No.10038. Litton has recently received a contract to provide an embedded GPS/INS system for a tactical aircraft. But even though this Honeywell laser gyroscope model was lightweight in comparison, it still used bulky glass prisms to form the triangular cavity, and a helium-neon . Thesis: "The Four Mode Linearly Polarized Ring Laser Gyroscope" Honors and Awards: Meritorious Teaching Award, University of Arizona, 1977-1978 Presidential Young Investigator Award, 1985 . LTN-92, one of the . See also This web page summarizes information in PubChem about patent JP-S56150884-A. laser gyroscope gyroscope assembly assembly ring Prior art date 1976-11-15 Application number IL5311877A Other languages English(en) Other versions IL53118D0(en Original Assignee Litton Systems Inc. Errors of an inertial navigation unit caused by ring laser gyros errors. Unit can be refitted for Honeywell Gyros as well as other Ring. Famous Class medium-endurance cutters. 6.1989- RLGA (Ring Laser Gyro Assembly): Honeywell GGI 320 RLGs, Sundstrand QA-1200 accelerometers. With the advent of ring-laser and fiber-optic gyros, this work was discon-tinued at Litton in the mid 1980s. Communications Suite. The contract calls for Litton Marine to retrofit Sperry MK 39 MOD3A ring laser gyro systems on all of the USCG 270-ft. The productionization of fiber gyros at Litton in the 1.0 to 0.1 deg/hr acuracy range will be reviewed. Litton Systems, Inc., Guidance and Control Systems Div., Woodland Hills, CA . Download. The medium accuracy standard ring laser gyro (RLG) inertial navigation unit (INU) exemplified by Litton's LN-93 system has benefited from continual improvements during the production process such . Some are triangular (Honeywell), whilst others have four sides (Litton). Basic concepts of the gas ring laser are reviewed. This paper presents a survey of ring laser gyroscope technology, the factors affecting its performance and techniques to overcome the limitations of lock-in effect. . Litton claimed not only monopolization by Honeywell, but also violation of its patent rights. The original cost of this unit exceeded $500,000. These nearly perfect mirrors are essential components in sophisticated ring-laser gyroscopes (RLGs) used for navigational control of aircraft. All unique, custom and hybrid systems are intact. V22N3.pdf. A ring laser gyroscope as defined in claim 1 wherein said substrate is quartz. The new-generation systems will replace the existing MK 29 spinning-mass gyrocompasses on the cutters. 6764339. This gyro is a 17.3 cm optical perimeter, 0.63 micron, body dithered laser gyro. What's Popular Guidance, Navigation and Control Conference. This includes chemicals mentioned, as reported by PubChem contributors, as well as other content . Guidance systems division products include navigation systems, add your family relationships between santa monica boulevard in designing, in oklahoma for customersworldwide. Test data demonstrate the superior performance of ZLGs for these applications. Simple models for inertial force sensitivity Gravity/Accelerations As atom climbs gravitational potential, The baro-inertial loop mechanization of the ring laser gyro (RLG) systems discussed here is the culmination of 20 years of progressive improvements in the way baro-altitude is combined with . Litton Ring Laser Gyroscope inertial sensors by a factor of 106. Litton Litef Sagem Sagem Sagem AIS AIS L3Com Sagem Kearfott Kearfott Litef Litton Astrium Thales Thales Thales Litef Thales MEMS Domaine MEMS RLG - FOG RLG - FOG HP . Litton makes and sells, as do others, a ring laser gyroscope (RLG), formed normally of a thermally and mechanically stable block of quartz ceramic material. Discovered sources of gyro errors and developed techniques to improve the performance. Has 17 publications in the open literature. Undithered and 40 percent smaller than conventional ring laser gyros, the Four Mode Laser Gyro provides high accuracy, high reliability and reduced costs. Read/Download File Report Abuse. Attention is given to such noise sources and noise-reduction techniques as Rayleigh backscattering, polarization fluctuation, and fiber-resonator optical Kerr effect. The Northrop Grumman G-2000 two-axis gyroscope is the smallest tactical-grade dynamically-tuned gyroscope available, offering proven high performance, small size, excellent reliability and low cost. Honeywell AN/APX-100 Identification Friend or Foe (IFF) system. In the case of the ring laser gyros used in the Litton. Developed data analysis techniques that are now IEEE standards for inertial sensors. They are well suited for high precision strap down Inertial Navigation Systems (INS) due to very . 4. Date: Priority . [2] Incorporates a Northrop Grumman (formerly Litton) LN-100G Ring Laser Gyroscope, a Rockwell Collins Global Positioning System (GPS), and a Kalman filter. Counter-rotating laser beams are generated in a cavity in the block and are reflected around the cavity by high quality, almost totally reflective mirrors affixed to the corners of the block. Figure 2.1 shows the flight test vehicle with laser, GPS, and differential uplink placements. The multioscillator ring laser gyroscope 319 with support electronics and a navigation computer comprise a complete strap-down inertial navigation unit. 1980/03/24. Navhouse is your total solution leader for the repair and overhaul of Honeywell, Litton and Delco inertial navigation products including inertial navigation units (INU), inertial reference units (IRU) and subassemblies including ring laser gyros (RLG), electromechanical gyros, platforms, accelerometers, CDUs, MSUs, and electronics. Litton's Guidance and Control Systems Division has developed a ring laser gyro (RLG) marine inertial navigation system (INS) which provides improved performance and reliability compared to the-current Navy standard which uses a gimbaled inertial measuring unit (IMU) with gas bearing gyros. Inside a typical optical gyroscope, a spooled-up optical fiber carries pulses of laser light. The ring laser gyroscope mount means of claim 1 further including: a cap screw for securing the coupler to the frame and pedestal, said screw having a socket head pressed flush against at least one washer, the screw being tightened as it is screwed into said pedestal; and, Litton Guidance and Control Systems Division, Woodland Hills, California. DANA ZETSUTO ANDAASON. The contract requires Litton Marine to retrofit Sperry MK 39 MOD3A ring laser gyro systems on all of the USCG 270-ft. (82.2 m) Famous Class medium-endurance cutters. Recent advances in this research field are reviewed. Resonant traveling wave optical excitation, (wavelength ) (Light-pulse) atom interferometry •Current (laboratory) atom optics-bdbased sensors outperform existing sensors. The plaintiff, Litton Industries Inc., filed suit against fellow aerospace company Honeywell Inc., alleging patent infringement in its use of a thin-film process to coat mirrors inside ring laser gyroscopes on aeroplanes - a technique that Litton and Honeywell, as the two main suppliers of the device, used to dominate the market for inertial . The suit charged that Honeywell ' s ring laser gyroscope, a navigational system used in both military and commercial aircraft, breached Litton ' s Commercial success of the He-Ne Ring Laser Gyroscope (RLG) began in the late 1980s and early 1990s. ZHAO Zheng-xin, Research on the Influence of Environmental Magnetic Field on the Precision of Differential Ring Laser Gyroscope, Changsha: National University of Defense Technology, 24 (2006). Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) receiver, a Maxon/Ashtech SM 3010 VHF telemetry uplink receiver, a Litton LN-93 ring laser gyro inertial navigation system (barometric altimeter aided), a laser reflector on each side of the fuselage, and an 80486 data acquisition computer. An alternate approach is also examined which is represented by a Zeeman multioscillator laser gyro. Plasma Shunting Apparatus And Method For Ring Laser Gyroscope: 5/30/2007: Griffith, Robert: Assignor: Application Publication Patent: 11755506 20080295597 A correction means is used to subtract out the effect of the dither from the output signal to the gyro. The technology is used on all modern commercial aircraft. The correction means includes feedback means in the correction-producing apparatus. Consultant, Litton Industries Guidance and Control Division, 1981 - 1982 Research Associate, University of New Mexico, 1980 - 1981 These are not gyros in the true sense, but they behave like gyros and sense the angular rate of motion about a single axis. Ring Laser Gyroscope is a single axis laser gyro angle sensor designed and developed for high accuracy launch vehicle navigation systems. . Results obtained in the past years in the development of the ring laser gyroscope and the fiber optic gyroscope are presented. LTN-92, one of the . Assignee: LITTON SYSTEMS INC. This system combines the proven, large production base LN-93 (CN-1656, (X-1674) Ring Laser Gyro INU with the next-generation Collins GPS receiver. The other agreement, the "Technical Assistance and License Agreement" (License Agreement), which had a 15 year duration, prohibited Louderback from using the patented process to make ring laser gyroscope mirrors for anyone but Litton. Litton did enjoy the positive settlement of two lawsuits in the early 1990s, however. In an alternative embodiment, the hub is stressed by placing it in tension using a rod within an aperture passing partway through the hub and . The interferometric fiber-optic gyro is to date a mature technology and was originally designed as a low-cost alternative to the ring laser gyro (RLG). . I believe these systems also have solid state piezo-electric accelerometers, but I thought they also need the rlgs. Berdasarkan cara mengukur rotasi, ada beberapa kategori gyro: mechanical gyro (menggunakan flywheel, sudah tidak populer), ring laser gyro (RLG - dominasi oleh Honeywell), fiber optic gyro (FOG - dominasi Northrop Grumann, dulu Litton), MEMS/Solid-state gyro. This contract is the fmt production contract for a full, military qualified, embedded GPS/LNS. Patent: JP-S56150884-A: Inventor: BUAAJIRU II SANDAASU. LOS ANGELES -- A federal jury awarded Tuesday a $1.2 billion verdict to Litton Industries Inc. against Honeywell Inc. in a patent infringement lawsuit involving gyroscopes used on airplanes . Northrop Grumman AN/ASN-166 Inertial Guidance Set (IGS). The productionization of fiber gyros at Litton in the 1.0 to 0.1 deg/hr acuracy range will be reviewed. An interferometric optical gyro (IOG) based on integrated devices are a promising alternative for miniaturized inertial sensors. The first is the LG-2717 missile gyro. . Search for more papers by this author. A very special thanks to Dr. Virgil E. Sanders of Litton Industries who was my advisor away from home. GPS-aided Inertial Technology and Navigation-based an integrated Global Positioning System (GPS) receiver and an Inertial . They found their solution in the AN/WSN-7 ring laser gyros from Sperry Marine Inc., a . To satisfy the US and foreign navies, stringent military requirements for shock (MIL-STD-901D), vibration (MIL-STD-167) and structure-borne noise (MIL-STD-740) demanded that a new approach . Performance data on the LN-200 system will be presented. He was my friend as well as my The principle behind a fiber optic gyro (and its close relative the ring laser gyro) is something called interferometry. Tech Log - irs ring laser gyros - Question is do all modern irs systems use some form of ring l@ser gyro or fiber optic gyro? I., Canfield, J.M., Gillespie, S.C.: Litton's second generation ring laser gyroscope. Remuzzi, Clinton C., "Ring Laser Gyro Marine INS . Surprisingly, today IFOG can substitute the RLG both in terms of manufacturing costs and that of performance, gaining prominence in a series of military and commercial applications [9, 10, 11 . Modern computerised aircraft use strapdown IRS (Inertial Reference Systems) that use ring laser gyros and do not suffer from machanical wonder, are lighter, quicker to align and do not need a level platform.A DI drifts (also called wander) because Earth gyros (aligned to Earth horizontal) like to remain constant in space, but are forced to . The medium accuracy standard ring laser gyro (RLG) inertial navigation unit (INU) exemplified by Litton's LN-93 system has benefited from continual improvements during the production process such . 9.2000 -QLN-2000 (GLN-200 with QA 2000 Accelerometer Triad): Litton fiber optic gyros The initial contract award, valued at $9.9 million, calls for delivery of 35 AN/WSN-7B systems, plus spares and technical support. WOODLAND HILLS, Calif., Sept. 13, 2010 -- Northrop Grumman Corporation (NYSE:NOC) has achieved a significant milestone by delivering its 7,000 th LN-100 Inertial Navigation System (INS), which provides primary and backup navigation information for a variety of airborne and shipboard platforms. A ring laser gyroscope as defined in claim 1 wherein each of said three means for creating nonreciprocal splitting is fixed to a planar surface of said frame at which terminal ends of segments comprising a single nonplanar cavity converge. WINS Layout With Litton G7 Gyros . Warren Macek of Sperry Circa 1963 Demonstrating the Ring Laser Gyro Concept 16. The LTN-101 also employs the patented AIME . The first agreement, the "Consulting Services Contract," was in effect between 1981 and 1983. A test program has been conducted with a view to defining methods for reducing the drift of optical passive ring-resonator gyros (OPRG). The medium accuracy standard ring laser gyro (RLG) inertial navigation unit (INU) exemplified by Litton's LN-93 system has benefited from continual improvements during the production process such that the present navigational accuracy and reliability are better by a factor of two or more over the original requirements as defined by SNU 84-1. Litton, Honeywell, Sperry, Singer-Kearfott, Sagerm(French): 1960's Military bombers, ships, fighter, ballistic missiles • MIT/Delco: Apollo guidance system 1969 • Honeywell: Electrically suspended gyro navigator 1967 • Sperry: First ring . They consist of a solid block of temperature stable glass within which there is a cavity or laser path filled with a lasing medium such as helium-neon. Publication: Unlike Ring Laser Gyro (RLG) which have low fragility levels (Max 50 g), the LN200 Fiber Optic Gyro Assembly can be exposed to levels as high as 90 g. This paper addresses the shock transient mitigation for shock requirements specified by MIL-S-901D. In this way, an optical gyro functions similarly to a mechanical gyro. . WINS Layout With Litton G7 Gyros . Read/Download File Report Abuse. 6764339. Later in the year, the federal government settled its suit against Litton regarding billing inconsistencies. U.S. Navy officials needed precision ring laser gyro navigation systems for surface ships and submarines. Various Pfeiffer Turbo Pumps (TMU260, TMU170, TMU065), four. (References 7 & 8). This technique takes a light source and splits it into two separate beams or wave trains. The ring laser block is a nonplanar cavity (Smith and Dorschner 1978a) made from an ultralow expansion material such as Cer-Vit® or Zerodur®. Defining an 8-lb gyroscope as "miniature" in 1965 was not unwarranted, especially considering that spinning-mass mechanical gyroscopes of the time could weigh 100 lb or more. 10 August 1992 - 12 August 1992. IEEE/Workshop on Autonomous Underwater Vehicles. However, the optical gyro operates by using light passing through a coil of optical fiber. HG9900 Inertial Measurement Unit. RLGs and FOLGs are rate gyros in concept (the outputs can only ever be proportional to angular rate) but what is basically required for an inertial system is angular DISPLACEMENT and not rate. Read/Download File Report Abuse. . The contract requires Litton Marine to retrofit Sperry MK 39 MOD3A ring laser gyro systems on all of the USCG 270-ft. (82.2 m) Famous Class medium-endurance cutters. CHARLOTTESVILLE, VA - The Naval Sea Systems Command has awarded a full-rate production contract to Litton Marine Systems for the new-generation AN/WSN-7B ring laser gyro systems. The LN-200 is an AHRS/missile IMU system, utilizing these gyros and silicon accelerometers, which is nearing completion of its productionization and has been selected for the new Army Comanche helicopter. [3] Communications Suite Rockwell Collins AN/ARN-182 UHF/VHF radio. Martin G. J., Gillespie S. C. and Volk C. H., The Litton 11cm Triaxial Zero-Lock Gyro, IEEE Position Location and Navigation Symposium, Atlanta, 49 (1996). Thanks are due to the Ring Laser Group at Litton Industries Guidance and Control Systems Division for making the experiments on the four-mode ring laser possible. [63] McGreevy, J. 3. Salient features of the laser gyro which are unique for gyro instruments are shown with data. The suit charged that Honeywell's ring laser gyroscope, a navigational system used in both military and commercial aircraft, breached Litton's manufacturing process patent. In the 1970s, the fabrication of the first low-loss single-mode optical fiber occurred at Corning. The gyro, Figure 4, features completely self-contained elec- The LTN-101 FLAGSHIP™ system utilizes Four Mode Laser Gyro technology, composed of two Zero-lock™ laser gyros (ZLG) in a single housing. "Fundamentals of Strapdown Inertial Navigation", Litton Systems Inc, Moorpark Ca, Rev C, May 1986 [64] Unknown, "An introduction to Inertial Navigation", Litton Systems Inc, Woodland Hills, Ca, Harga gyro mulai dari puluhan ribu dollar sampai satu dollar per axis, semuanya . The Litton 11 cm triaxial zero-lock gyro. A fiber optic gyroscope detects changes in position or direction using the Sagnac effect. The Litton program has developed two major candidate laser gyros for the various guidance applications. Another origin of magnetic biases in both square and triangular ring laser gyros, namely stress-induced linear birefringence in the gyro mirrors, is examined and possible experimental . Virgil taught me my ring laser know-how. Litton fiber optic gyros (FOGS), Litton silicon accelerometers (SiAc's 'M). A mechanically dithered single-axis laser gyro is presented which operates on 28 vdc unregulated input and generates data in T2L format up to plus or minus 800 deg per second. Data from naval-technology.com . A dithered ring laser gyroscope is mounted upon a support, and a pickoff is positioned between the gyro and the support to produce signals representative of rotation angle between the support and the gyro. Meanwhile, Happer and his group at Princeton published an extensive set of investigations into the fundamental physics of hyperpolarized noble gases (Happer et al., 1984; Walker and Happer,1997;Zengetal.,1985). The LN-200 is an AHRS/missile IMU system, utilizing these gyros and silicon accelerometers, which is nearing completion of its productionization and has been selected for the new Army Comanche helicopter. Litton Systems, Inc. litigation, intellectual property, and other public records. Litton Ring Laser Gyroscope Fibersense Fiber-optic Gyroscope AI AI Performance of current generation atom interferometric sensors Source: Proc. a POS Inertial . In the case of the ring laser gyros used in the Litton. The role of integrated optics and . However, improving their accuracy, which is determined by the sensing coil insertion loss, is crucial. Various biasing methods to eliminate some of these basic problems are presented. Litton Systems, Inc. United States C Corporation. Performance enhancements are now available which . Good work at litton guidance and control units. Photonics for angular rate sensing is a well-established research field having very important industrial applications, especially in the field of strapdown inertial navigation. Honeywell AN/APX-100 Identification Friend or Foe (IFF) system. S. C. Gillespie, J. G. Mark, D. A. Tazartes, "Multioscillator Ring Laser Gyroscopes and their Applications, Litton Guidance and Control Systems, 5500 Canoga Ave, Woodland Hills . G-2000 DTG Gyroscope Product Suite. Cite. GPS-aided Inertial Technology and Navigation-based an integrated Global Positioning System (GPS) receiver and an Inertial . The gyro is presently less than three inches in diameter, which is size competitive with current ring laser gyros of equal performance. These efforts led to the introduction of ring laser gyro systems onto military and commercial aerospace platforms in the late 1970 and early 1980s. Navhouse's full-service inertial repair & overhaul facility has capabilities on a wide range of Honeywell, Litton and Delco inertial reference and inertial navigation systems and inertial components including ring laser gyros (RLG), electromechanical gyros, platforms, accelerometers, CDUs, MSUs, and electronics. Nonplanar active ring laser cavities and their uses for the gyro builder are discussed and it is shown how a slightly nonplanar configuration may create magnetic sensitivities and how they may be controlled. Joint development with Honeywell Inc. (Reference 5) . A recognized expert and a major contributor to the development of ring laser and fiber optic gyros. Incorporates a Northrop Grumman (formerly Litton) LN-100G Ring Laser Gyroscope, a Rockwell Collins Global Positioning System (GPS), and a Kalman filter. Performance data on the LN-200 system will be presented. Abstract: Litton Marine Systems is manufacturing the third generation of the marine inertial navigators at the Sperry Marine Division using a new generation of dithered ring laser gyros (RLG) by Honeywell. The HG9900 is a high performance navigation-grade Inertial Measurement Unit (IMU) designed to meet the needs of a broad range of navigation, guidance and control applications. Rockwell Collins AN/ARN-182 UHF/VHF radio. At the time, Litton and Honeywell were the only suppliers of ring-laser gyroscopes?technology that provides aircraft navigational systems essential information about an airplane's movements. Litton is developing an interferometric fiber optic gyroscope for future navigation, guidance, and stabilization applications. J. STANLEY AUSMAN, J. STANLEY AUSMAN. a POS Inertial . An RLG shoots two laser beams in opposite directions around a ring of mirrors and measures any differences in their time of traversing the circle. Read/Download File Report Abuse. The Delco Carousel 4A system did not use rate gyros and I am fairly certain that the pre-Type 82 Litton systems did not either. V22N3.pdf. In this paper we report on the bias, scale factor, and input axis alignment . Fibersense Fiber-optic Gyroscope. 493-502, 24-26 Sept 1991. Proceedings of the 15th Biennial Guidance Test Symposium, Holloman Air Force Base, New Mexico, USA, pp. What makes a fiber optic gyro impressive is its use of light beams to determine if a vessel has rotated on its yaw, pitch, or roll axes. A survey of ring laser gyroscope technology, the factors affecting its performance and techniques to overcome the limitations of lock-in effect is presented. Show Abstract. Ring laser gyro. Deliveries will begin in 2000 and will continue over the next four years. This new Reference System satisfies stringent military shock and vibration requirements. Shortly thereafter, Dr. Victor Vali and Professor Richard Shorthill at the University of Utah . Low noise, high bandwidth, low quantization, and immunity to transients under high dynamic environments are features of the ZLG that make it applicable to space satellite attitude control system and pointing and tracking applications. The HG9900 has been successfully deployed on a wide range of weaponry, UAVs, stabilized platforms and commercial applications. Laser Gyro 17. . In addition, Litton will be operated as a wholly owned subsidiary of Northrop Grumman. A means for stressing the hub of a laser gyro dither mechanism is provided including a compression bolt passing through an aperture in the hub and having a nut threaded thereon for tightening against the hub until a desired dither frequency is achieved. Bertran 210-05R Power Supplies and two Granville Phillips 280. Laser Gyroscopes. Protected: LN-251 Advanced Airborne INS/GPS (EGI) . These include the lock-in phenomena, geometric performance factors, and other problem areas. ring laser laser gyroscope gyroscope ring laser Prior art date 1985-06-27 Legal status (The legal status is an assumption and is not a legal conclusion. "Our LN-100 product's longevity is driven by performance," said Gorik Hossepian, vice president of . Marconi FIN3110 ring laser gyro inertial navigation unit Credits : Inertial Navigation - Forty Years of Evolut ion, by A. D. Pending Application number JP61149899A Other languages English (en) Inventor In 1993, Litton won a $1.2 billion jury award from competitor Honeywell Inc. More. Mentioned, as well as other ring atom interferometric sensors source: Proc,... Test vehicle with laser, GPS, and fiber-resonator optical Kerr effect your. Iff ) system noise-reduction techniques as Rayleigh backscattering, polarization fluctuation, and differential uplink placements not monopolization! 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