Дрейф зеемановского лазерного гироскопа с переключением продольных мод генерации
The paper is devoted to the investigation of the physical reasons of time and temperature drifts of Zeeman laser gyro with periodic realignment of the laser longitudinal generation mode with the light wave opposite circular polarization. It is designated that gyro drift can be divided into magnetic and non-magnetic components having different nature and provides significantly different contribution to the final error. The expression of total error depending on the gyro operation mode is presented. The reasons of magnetic and non-magnetic drifts are described and optimal algorithmic methods of their compensation are proposed both with initial calibration and without it. Experimental results for several Zeeman laser gyroscopes with drifts typical values are analyzed.
The laser gyros operating in wide temperature range need in the effective correction of the drift. The paper is devoted to the investigation of the physical reasons of time and temperature drifts of Zeeman laser gyro with periodic realignment of the laser longitudinal generation mode with the light wave opposite circular polarization. It is designated that gyro drift can be divided into magnetic and non-magnetic components having different nature and provides significantly different contribution to the final error. The expression of total error depending on the gyro operation mode is presented. The reasons of magnetic and non-magnetic drifts are described and optimal algorithmic methods of their compensation are proposed both with initial calibration and without it. Experimental results for several Zeeman laser gyroscopes with drifts typical values are analyzed.
Instructions contain theoretical information necessary to perform laboratory work "Measurements of laser gyro parameters", a description of the procedures and requirements to the report. Intended for master students studying the discipline "Control, orientation and navigation systems" (in the direction of learning 231300.68 Applied mathematics - master's program in "Control and information systems engineering").
In 1964 first laser gyros with Zeeman magnetooptical biasing were developed in RDI "Polyus". During elapsed years these devices passed several stages of improvements, and laser inertial systems at their base were created and are being produced to be applied in systems for moving objects control.
This paper desribes the history of a laser gyro, which originated from one of the fundamental physics area - optics of moving media, and in particular the Sagnac effect. The development of the ring laser gyro construction concepts from its first samples of minimal configuration to multi-frequency Zeeman modifications with nonplanar resonators is observed.The general trends in the inertial sensors market are presented.
Virtual laboratory workshop for laser gyroscope studying is described. The computer measurements concepts are explained according to the new Russian standard. The virtual models application at workshop designing and in the educational process are considered.
The results of development the optimal software for Zeeman laser gyro perimeter control and output signal false component compensation basing on the real operation conditions and own laser specifications.
A model for organizing cargo transportation between two node stations connected by a railway line which contains a certain number of intermediate stations is considered. The movement of cargo is in one direction. Such a situation may occur, for example, if one of the node stations is located in a region which produce raw material for manufacturing industry located in another region, and there is another node station. The organization of freight traﬃc is performed by means of a number of technologies. These technologies determine the rules for taking on cargo at the initial node station, the rules of interaction between neighboring stations, as well as the rule of distribution of cargo to the ﬁnal node stations. The process of cargo transportation is followed by the set rule of control. For such a model, one must determine possible modes of cargo transportation and describe their properties. This model is described by a ﬁnite-dimensional system of diﬀerential equations with nonlocal linear restrictions. The class of the solution satisfying nonlocal linear restrictions is extremely narrow. It results in the need for the “correct” extension of solutions of a system of diﬀerential equations to a class of quasi-solutions having the distinctive feature of gaps in a countable number of points. It was possible numerically using the Runge–Kutta method of the fourth order to build these quasi-solutions and determine their rate of growth. Let us note that in the technical plan the main complexity consisted in obtaining quasi-solutions satisfying the nonlocal linear restrictions. Furthermore, we investigated the dependence of quasi-solutions and, in particular, sizes of gaps (jumps) of solutions on a number of parameters of the model characterizing a rule of control, technologies for transportation of cargo and intensity of giving of cargo on a node station.
Generalized error-locating codes are discussed. An algorithm for calculation of the upper bound of the probability of erroneous decoding for known code parameters and the input error probability is given. Based on this algorithm, an algorithm for selection of the code parameters for a specified design and input and output error probabilities is constructed. The lower bound of the probability of erroneous decoding is given. Examples of the dependence of the probability of erroneous decoding on the input error probability are given and the behavior of the obtained curves is explained.
Event logs collected by modern information and technical systems usually contain enough data for automated process models discovery. A variety of algorithms was developed for process models discovery, conformance checking, log to model alignment, comparison of process models, etc., nevertheless a quick analysis of ad-hoc selected parts of a journal still have not get a full-fledged implementation. This paper describes an ROLAP-based method of multidimensional event logs storage for process mining. The result of the analysis of the journal is visualized as directed graph representing the union of all possible event sequences, ranked by their occurrence probability. Our implementation allows the analyst to discover process models for sublogs defined by ad-hoc selection of criteria and value of occurrence probability
The Handbook of CO₂ in Power Systems' objective is to include the state-of-the-art developments that occurred in power systems taking CO₂ emission into account. The book includes power systems operation modeling with CO₂ emissions considerations, CO₂ market mechanism modeling, CO₂ regulation policy modeling, carbon price forecasting, and carbon capture modeling. For each of the subjects, at least one article authored by a world specialist on the specific domain is included.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.