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  • In connection with the situation with  coronavirus the meetings of the ACS department are held in the online mode "Conferences on the ZOOM platform".

Improved reliability of the magnetometric system of the aircraft

 

Based on the reliability analysis of a digital magnetometric system based on a three-axis magnetometer, the method of structural redundancy of the magnetometer was chosen to improve reliability. The system is a parallel redundancy structure. Due to the choice of the number of backup elements under loaded redundants - the number of magnetometers in the redundant system is three. Algorithms for diagnosing and eliminating magnetometer failures in a magnetometric system have been developed.

The scientific work consists of an introduction, four chapters, conclusion, 4 applications. The total volume is 95 pages, of which 80 basic text, 50 figures, a list of 4-page links and 4 applications on 11 pages.

Relevance of the topic. Research in the direction of orientation systems aimed at addressing one of the main objectives-improved accuracy due to system upgrades (reduction of instrumental errors) or the use of new data-processing algorithms (decrease methodological errors). Progress in micromechanical systems (MEMS) makes it possible to use miniature inertial sensors in various devices. The accuracy characteristics of devices based on these sensors are not very high. There is a problem of using new methods of modeling and using data from various sources of information - the problem of integration. Therefore, to achieve the maximum possible efficiency of such systems, great attention must be paid to their calibration, investigation of possible errors of a different nature, the introduction of filtering algorithms, and also to the evaluation of the accuracy with the use of sensitive elements that are part of the orientation system.

Proceeding from this, such a systematic approach to solving the problem of increasing the accuracy of the system will allow us to obtain the maximum possible exact characteristics on the basis of which the algorithm consists and therefore is an actual research work.

Target dissertation work is to develop an orientation system and its calibration, development and implementation of a neural network model of the Earth's magnetic field to increase the accuracy of the system.

Achieving the goal involves the following tasks:

  • Analysis of the current state of methods for increasing the accuracy of orientation systems by introducing filtering algorithms;
  • Calibration of sensing elements;
  • Determination of the coefficients of the complementary filter, for filtering and integrating information from sensors;
  • Finding a neural network for approximating the mathematical model of the Earth's magnetic field.
  • Use of the system algorithm to determine the orientation of the object based on the output signals of the primary sensors;
  • Experimental confirmation of the results.

Research Methods. Calibration of inertial sensing elements. Finding the spectral density and determining the filter coefficients. Simulation of the neural network for the Earth's magnetic field model. Determination of the angular position of the orientation system using the orientation algorithm.

Scientific novelty of the dissertation is to improve the accuracy of the orientation system for aircraft, vehicles, satellites, mobile phones, control devices ("gamepad", "joystick"), robotics by introducing the Earth's magnetic field, reducing the time of its calculation with a neural network, using the calculated complementary filter and the integration of the output signals from the sensors for mutual noise filtering.

Keywords: algorithm, orientation system, neural network, IGRF, calibration, complementary filter, integration.

An ultrasonic system for measuring the air velocity vector for an unmanned aerial vehicle was developed. His mathematical model, model of its errors, and a layout were developed. This system was designed to measure the speed from 19m \ s to 90m \ s and can measure not only the module of air velocity and its direction. With an accuracy of 0.01 m with the values ​​of the vector and with an accuracy of 0.5 degrees angle of attack and slip.

The system was made on the basis of FPGA Cuclon 4 from the company Altera.

Keywords: measuring device, angle of attack, angle of inclination, air velocity vector

Robust controller of unmanned aerial vehicle motion parameters on aeroballistic trajectory is developed. Synthesis was carried out using the 2-Riccati approach of the -theory. In the presence of control object model parametric disturbances, the regulator provides the specified quality of the transient process, as well as the absence of a static error in the control of a velocity bearing angle. The regulator turns the control body on the basis of information only about the velocity bearing angle. The results of simulation of the synthesized robust controller, as well as the PID controller under the same conditions, are presented.

Key words: unmanned aerial vehicle, robust controller, velocity bearing angle

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