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Том 9, № 2 (2018)
- Год: 2018
- Статей: 6
- URL: https://journals.rcsi.science/2075-1087/issue/view/12711
Article
Specific Features of Constructing a Dual-Mode GNSS Gyrocompass as a Tightly-Coupled Integrated System
Аннотация
A task of constructing a tightly-coupled inertial satellite integrated system under the conditions of limited visibility is considered in terms of solving both orientation and navigation problems. To determine the orientation parameters of a moving object, a dual-mode GNSS gyrocompass is implemented, which comprises a gimballess inertial measurement unit (IMU) on fiber-optic gyros (FOG), and two-antenna receiving equipment (RE) of global navigation satellite system (GNSS). Algorithms and errors of a GNSS gyrocompass with antenna baseline at the level of wavelength of carrier frequency and satellite receivers with external reference oscillator are studied. At that, the IMU with the antenna module of GNSS RE operates in reversible modulation rotation mode. A specific feature of this system is that a GNSS gyrocompass can be constructed while observing at least one navigation satellite of GPS or GLONASS; moreover, it has an autonomous operation mode which implements an AHRS scheme and position dead-reckoning based on the IMU and log data in absence of signals from the navigation satellite. The ambiguity of phase measurements and unreliable measurements are removed by referring to the IMU data when forming differential measurements in the integrated system at the level of the first differences of phases. The results of desktop analysis of bed testing data for a prototype system with a GNSS gyrocompass Orion-M (designed by CSRI Elektropribor) comprising GNSS receiving units 2K-363E-62 (RIRV JSC) and FOG-based inertial unit VG 910 (Fizoptika JSC) are presented in the paper.
97-105
Determination of Orientation Angles in Dead Reckoning Systems with One Free Gyroscope
Аннотация
The paper considers the development of the approach proposed earlier by the author to ensure nonperturbation of dead reckoning, based on the construction of a single-channel inertial vertical using a trihedron of accelerometers and one free gyroscope. In order to improve the accuracy of instantaneous orientation angles needed to solve vehicle control problems, proposed method uses the data from the inertial vertical channel, the difference in heading values generated with the use of information from the free gyro and a “budget” MEMS inertial unit, and the log readings processed in accordance with the principle of gyroscopic orientation with a controllable pendulum. The simulation results are presented that confirm the effectiveness of the proposed method.
106-115
Analysis of Temperature Fields in Angular Velocity Measurement Units on Fiber-Optic Gyros
Аннотация
Mathematical models of 3D transient temperature fields in angular velocity measurement unit (AVMU) and constituent fiber-optic gyros both in basic structure and in the structure with reversible heat control system (HCS) are developed and implemented. Comparative analysis of temperature fields under complex temperature effects is conducted. Efficiency of reversible double-circuit HCS application is assessed.
116-123
Determining Deflections of the Vertical in the Western Siberia Region: The Results of Comparison
Аннотация
At present, information on deflections of the vertical (DOV) is obtained by means of modern global geopotential models. The authors have derived DOV model values in the Western Siberia region. The results of the comparison of the DOV model values calculated with the use of the global geopotential model EIGEN-6C4 and the astrogeodetic measurements taken in the Western Siberia region are analyzed. The study has shown that in plains, standard deviations of DOV model values from the terrestrial data obtained by traditional astrogeodetic method do not exceed 1 arcsec.
124-130
The Results of Software Joint Processing of Signals from Global and Regional Navigation Satellite Systems
Аннотация
The paper considers joint software processing of signals from global (GLONASS, GPS, BeiDou, Galileo) and regional (IRNSS) navigation satellite systems. A general block diagram of the prototype multiconstellation software-defined radio (SDR) is presented; its capabilities to process signals from navigation systems are discussed. The developed SDR allows for separate and combined navigation solutions using signals received in Russia’s North-West from 30 satellites of 5 different navigation systems. The accuracy of these solutions and the DOP values are analyzed.
131-137
Comparison of Time Scales by the Common-View Method Using GLONASS Measurements and Taking into Account the Integer Property of Phase Ambiguities
Аннотация
Comparison of time scales by a differential method using signals from global navigation satellite systems (GNSS) is discussed. The results of the experimental study show the possibility of taking into account the integer property of ambiguities of GLONASS navigation satellites. The random error in the comparison of time scales is about 55 picoseconds.
138-146