Feature of information receiving of earth remote sensing from low-orbital space vehicles

У статті розглядаються особливості побудови антенного комплексу для стеження за супутником і прийому даних дистанційного зондування Землі з космосу. Наведено структуру і алгоритм роботи розробленої системи керування антенною системою, що входить до складу наземних засобів прийому передачі інформації EgyptSat-1. Також наведено результати досліджень похибок наведення та динамічного супроводу космічних апаратів за результатами випробувань АС в ЄгиптіIn this article are considered the peculiarities of the antenna complex construction for the satellite tracking and receiving of remote sensing of Earth information from space. The structure and working algorithm of antenna control system (which is included in the system of ground facilities of receiving and transmitting of information of EgyptSat-1) are described. The researching results of pointing errors and dynamical autotracking of space vehicles according to the results of testing in Egypt, are also represented

Investigate of dynamic errors of precision system antenna control with asynchronous driver

Досліджено динамічні похибки, що виникають при наведенні та супроводі траєкторій супутників у системі керування великогабаритною антеною з частотно регульованим асинхронним електроприводом при використанні різних законів керування. Наведено результати моделювання та зроблено порівняння з експериментальними даними, отриманими при випробуваннях розробленої системи керування антеною під час відпрацювання тестових траєкторій.This paper considers the investigation of dynamic errors occurring in the control system of precision antenna complex using frequency regulated asynchronous electric drive as the actuator. Simulation model of the system induction motor - frequency regulator is synthesized. The detailed parameters calculation of asynchronous motors (AM) and frequency regulator is carried out. Simulation model of frequency speed AM adjusting for precision control of AS mechanical modules in the system Matlab/Simulink is synthesized. PID controller coefficients is synthesized for the model of frequency regulation as a part of the overall as management system to control the trajectory support. Computing power UFR appreciates the current angular position of the rotor flux linkage vector-based interpretation in real-time systems of differential equations, according to the mathematical model of the asynchronous engine. The comparative results of the survey errors obtained using simulation modeling in different modes for different law of the torque support at low revs are presented. The experimental data of operation of the large-sized antenna control system with vector control in frequency regulated device during working of test trajectories are presented. The results of simulation and comparison are made on experimental data obtained while testing AS «EgyptSat-1» during working out the test trajectories. The developed technique makes possible to choose reasonably the method of control and parameters of the system asynchronous motor – the device of frequency regulation in the problems of control systems synthesis by complex objects. The use of techniques for creation precision control systems for antenna complexes to ensure communication with LEO satellites of remote sensing and the radio systems is of practical value, which will improve reliability and reduce the cost of such systems

Improvement of the measurement accuracy of the support-rotary platform of the antenna system using mems accelerometers

Досліджено похибки, що виникають внаслідок поперечного нахилу площини корпусу сенсора кута на основі MEMS інклінометра. Наведено результати дослідження, отримані при вимірюваннях кутів опорно-поворотної платформи антени, запропоновано метод підвищення точності на основі використання трьохосьового MEMS акселерометра та процедури калібрування сенсора перед початком роботи.Summary The article is devoted to the research of errors arising from the influence of non-linear characteristics of MEMS gyroscopes, which appear at high angles deviation plane of the crystal sensor from horizontal surface, and also from the influence of cross slope plane casing MEMS inclinometer which is based on gyroscopic sensor. The research for the purpose of estimation possibility of using such sensors for precision control tasks in controlling antenna system based on support-rotary platform with paralel kinematic links and octahedral composition Hexapod type and other targeting systems have been performed. The automated laboratory stand for research of MEMS gyroscope parameters which allows to compare results of measurements and data of pecision optoelectronic angle sensor in range ±90° with presence of transverse slope influence has been developed. The results of experimental research, which shows main sources of MEMS inclinometer errors with their numerical estimation, are presented. The method of increasing the accuracy of the angular position determination by means of using three-axis MEMS accelerometer is proposed and sensor calibration procedure before commencement of operation is considered. The importance of the method based on considering information received from two other mutually-perpendicular coordinate axes to compensate the negative influence of cross slope on the main axis by creating cross interactions correcting matrix has been analysed. Due to angle calculation using 12 calibrated parameters the errors were decreased owing to crystal cross slope influence and MEMS sensor non-linearity conversation with slope angles above 45 degrees. The using of the method has practical value in the tasks of designing precision antenna complex control systems with new the Hexapod type support-rotary platforms, in robotics and many other technical targeting systems. The method allows to increase the accuracy, reliability and to reduce the cost of such systems

Modeling of vector control scheme of asynchronous electrodrive of antenna system for tracking of low-orbital space vehicles

В статті пропонується метод керування наведенням наземних антенних систем на космічні апарати за допомогою силового слідкуючого приводу, в основі якого лежить асинхронний електропривід. Здійснено аналіз і запропоновано ефективний спосіб керування даним електроприводом. Також здійснено математичний опис роботи двигуна, який приведено до зручної форми обчислення з можливістю підстановки реальних значень. Розроблено модель системи автоматичного керування, в якій втілено принцип поєднання модульного і векторного ШІМ-управління.In this article is represented method of ground antenna system pointing to space vehicles, using power tracking drive, which is based on asynchronous electrodrive. It was made the analysis and was offered the effective method of control of this electrodrive. The mathematical description of the motor work was made, and this description was brought to suitable form of calculation, including possibility of real value substitution. It was developed the model of automatic control system, in which was embodied the principle of combination of module control and PWM-control