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Ring laser gyroscope

About: Ring laser gyroscope is a research topic. Over the lifetime, 2070 publications have been published within this topic receiving 18609 citations. The topic is also known as: Sagnac interferometer.


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Book ChapterDOI
01 Jan 2022

1 citations

Journal ArticleDOI
TL;DR: In this article, the axial RLG drift, initial heading and attitude error, and initial velocity error on the longitude and the latitude were analyzed on the stationary base, and a new method based on the least squares was proposed to calibrate the RLD drift precisely.
Abstract: On the basis of error propagation characteristics of an Inertial Navigation System(INS) and the effect of axial Ring Laser Gyroscope(RLG) on the errors of longitude and latitude,a calibrating method for the RLG drift was proposed to solve the problems that single-axis rotation could compensate the vertical RLG errors automatically,but could not compensate the axial RLG errors in a single-axis rotation INS.First,the auto-compensation principle of the single-axis rotation INS was introduced briefly.Then,the effect of the axial RLG drift,initial heading and attitude error,and initial velocity error on the longitude and the latitude was analyzed on the stationary base.Depending on the errors of longitude and latitude,a new method based on the least squares was proposed to calibrate the RLD drift precisely.Finally,the static and vehicle navigation experiments were performed.The results show that the identification precision reaches 0.000 5(°)/h and radial position error of the INS is less than 1 nm/72 h.The axial RLG drift can be calibrated precisely by the least square method proposed and the experiment result of navigation meets practical demands.

1 citations

Book ChapterDOI
01 Jan 2004
TL;DR: Fiber-optic rate sensors (µ-FORS) as discussed by the authors can be easily calibrated separately and later assembled to modular systems, which are used in inertial strapdown systems.
Abstract: Fiber-optic gyros (FOGs) and micro-electro-mechanical-systems (MEMS) accelerometers are used today in inertial strapdown systems for medium accuracy and expanding into high-performance strapdown navigation systems in competition with ring laser gyros (RLGs), whereas from the low-accuracy side, MEMS gyros are used for expanding to the medium accuracy ranges. The FOG principle is based on constant light velocity. This results in a phase difference of lights which are propagating through a fiber coil in clockwise (cw) or counterclockwise (ccw) directions if a rate is applied. The phase difference is proportional to the rate. The FOG technology has been developed from an open-loop design — still used in some market niches — to closed-loop design with high bandwidth and random phase modulation technique. The first generation of FOG systems uses one light source split by a 3×3 coupler to three fiber coils. More than 15.000 FOGs for such triad systems have been produced and delivered. Typical applications are Attitude and Heading Reference Systems or Land Navigators, which are described. The second generation of FOG systems uses single-axis FOGs with internal processors. A large quantity of these fiber-optic rate sensors (µ-FORS) can be easily calibrated separately and later assembled to modular systems. The features of the µ-FORS family for bias values from 6°/h down to 0.05°/h are given. The different bias values are realized by adapting the fiber length on the coil. The other optical parts and the electronics are unchanged. One main feature for the common electronics is the tracking of the modulation frequency to the actual fiber length.

1 citations

Journal ArticleDOI
TL;DR: In this article, an initial alignment using UKF (Unscented Kalman Filter) is designed and analyzed, which includes comparison between conventional initial alignment loop using fixed gain type controller and proposed initial alignment with UKF.
Abstract: RLG(Ring Laser Gyroscope) is a main device of LINS(Laser Inertial Navigation System). RLG has the lock-in region in which there is no output signal. To alleviate the lock-in problem, a mechanical oscillation, the dither motion, is applied on RLG. A LPF(Low Pass Filter) is usually used on the output of RLG and accelerometer to remove the noise that is made by the dither motion. When the LINS is induced the disturbance during the initial alignment, it takes more time on alignment due to the use of the LPF and a fixed gain controller. In this paper, an initial alignment using UKF(Unscented Kalman Filter) is designed and analysed. Analysis include comparison between conventional initial alignment loop using fixed gain type controller and proposed initial alignment using UKF. Moreover, Disturbance inducing test results are demonstrated.Key Words : Laser Inertial Navigation System(레이저 관성항법장치), Initial Alignment(초기정렬), Disturbance(외란), Unscented Kalman Filter 1. 서 론 관성항법장치는 자이로 및 가속도계 등 관성센서를 이용하여 정밀한 위치 및 속도, 자세 정보를 실시간 제공하는 장비로서 유도무기를 비롯하여 지상, 해상,

1 citations

Journal Article
TL;DR: In this article, the working principle and applications of mechanical gyroscope, annular laser, optical fiber, hemispherical resonant, and quartz tuning fork are briefly introduced in military fields and the development trend of gyro-guidance system are forcasted.
Abstract: The working principle and applications of mechanical gyroscope, annular laser gyroscope, optical fiber gyroscope, hemispherical resonant gyroscope, quartz tuning fork gyroscope are briefly introduced in military fields, and the development trend of gyro-guidance system are forcasted.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202347
202275
202130
202062
201963
201841