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The gravity model of WGS84 is commonly used in the calculation of gravitational acceleration known as normal gravity vector, but it cannot meet the requirements for high-precision inertial navigation systems because of the gravity anomaly. In this paper, the effects of gravity vertical deviation on navigation accuracy are analyzed and the principle of compensation is studied based on vertical deviation...
We consider the problem on synthesis of the guidance laws and algorithms for digital attitude control for an observation spacecraft at areal land surveying. The land surveying is carried out by a set of extended orthodromic routes of scanning optoelectronic observation for a given part of the Earth surface. We present results on the efficiency of the developed vector spline guidance laws, algorithms...
In this article the study of the multifrequency generation regime in a laser gyroscope was undertaken. The study is performed on a laser gyroscope with a broadband solid-state wide-range active medium YAG:Cr4+ and a gyroscope on a semiconductor optical amplifier and with a fiber-optic cavity. Mode-locking was used in order to improve stability and reduce noise. Using Lamb theory-based equations, a...
This paper describes a determination of a generalized mathematical model in a state-space representation for a synthesis of both classical control laws and controllers, taking into account parametric uncertainty. It researches an influence of pendulous accelerometer parameter uncertainty on a current value of a momentum set unit within a feedback circuit. A current under consideration is an analogue...
Digital laser gyroscope with lock-in minimization system GM-2 is developed by JSC ITT to solve the problems of inertial navigation system construction. Nowadays a laser gyroscope prototype is developed, laboratory tests are carried out, control and information processing algorithms are optimized.
The brief overview of atom interferometers development for new generation of inertial sensitive elements on the de Broglie waves is presented. The transmission functions of atom interferometers (dependence of phase differences of counter propagating waves of interferometers from external factors (absolute rotation and acceleration of interferometer) and internal factors (ideology of construction of...
In this paper, the choice of optimal parameters of inertial masses used in a solid-state gyroscope (SSG) on standing surface acoustic waves (SAW) is considered. The results of a theoretical analysis of the standing wave field in a SAW resonator under the action of angular velocity are presented. Special attention is paid to the use of stress concentrators for which finite element models have been...
The report presents a brief overview and comparative analysis of laser gyroscopes frequency biasing and fiber optic gyroscopes phase biasing. Similarities and differences are commented. For the first time, it has been proposed to use practical experience for optimization of the laser gyroscopes frequency biasing for further optimization of fiber optic gyroscopes phase biasing in order to further improve...
For the phenomenon of the lock-in area and quality factor for dither mechanism vary with the temperature in laser gyro with total reflection prisms (TRP-LG), as well as the traditional mechanical dither control method with controlling the stability of offset and fixing the depth of noise cannot guarantee high measurement precision. TRP-LG's lock-in error characteristics are studied systematically...
The present work investigates the feasibility of determining the relative orientation of a formation flight of two nanosatellites with the help of a specialized system based on a multifrequency transceiver. The solution of this task will allow controlling the movement of the nanosatellites relative to the center of mass during their formation flight. To determine the relative orientation the algorithm...
Now nanosatellites of the CubeSat format are most popular among the other nanosatellites. The nanosatellites of the CubeSat format can be used for various purposes, for example, for carrying out the experiments on geophysical field studying, for remote sensing of the Earth with the low/average resolution, etc. The attitude control system plays an important role in the solution of goal-oriented problems...
Uncontrolled attitude motion of a gravitationally-aerodynamically stabilized LEO nanosatellite is considered. The analytical cumulative distribution functions of the maximum angle of attack for Rayleigh and uniform distributions of the nanosatellite's initial transverse angular velocity value were obtained. The formulas for choosing the design parameters of the gravitationally-aerodynamically stabilized...
The paper deals with the functioning and analysis of the accuracy of various instruments and systems of orientation, stabilization and navigation on micromechanical gyroscopes (MMG) and accelerometers (MMA). Analytical relations for calculation of errors of the commander of commands of the rotating carrier, strapdown verticals, strapdown inertial navigation system (SINS), system of measuring of vertical...
In 2015, InnaLabs reported on the development of a range of specialist, precision Quartz Pendulous Accelerometers [1]. The performance requirement for these accelerometers was a key design driver for meeting the market needs within the tactical and the navigation grade market segments. In order to extend InnaLabs offering to cutting edge, volume applications with more stringent and highly dynamic...
In this paper, we present the development and analysis of a bistable suspension system of a micromechanical actuator. The efficiency of such an actuator and the feasibility of the concept are assessed experimentally. The improvement of the comb-like micromechanical actuator enables the reduction of a driving potential amplitude of a vibration structure gyroscope. Thus the electrical noise can be reduced.
The paper describes the hardware and software architecture of the developed multi MEMS sensor prototype module, consisting of ARM Cortex M4 STM32F446 microcontroller unit, five 9-axis inertial measurement units MPU9255 (3D accelerometer, 3D gyroscope, 3D magnetometer and temperature sensor) and a BMP280 barometer. The module is also equipped with WiFi wireless interface (Espressif ESP8266 chip). The...
The peculiar features of angular velocity and linear acceleration micromechanical transducers application for implementation of primary information sensors arrays used in automatic control systems of helicopter-type aircraft are considered. Difficulties arising from the replacement of previously used inertial transducers by the modern transducers of different type are described. The techniques for...
The paper presents a nonlinear mathematical model of a biaxial gyroscopic stabilization system on micromechanical sensitive elements, which makes it possible to investigate the features of the system functioning. Structural solutions for constructing the amplifying-transforming path of the correction loops have been developed, which provides an increase in the accuracy of the functioning of the gyroscopic...
An invariant scheme for integrating an odometer with a three-component inertial navigation system (SINS) of a land vehicle is considered. The account of non-holonomic constraints and odometer speed along the longitudinal axis of the land vehicle allows within the framework of the Kalman filtering to estimate the scale factor of the odometer and the angles of the discrepancy between the body system...
The calibration problem is considered for the accelerometer unit by means of a high-precision motion simulator. The guaranteed approach is proposed to solve the calibration problem.
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