Система ориентации на основе микромеханического инерциального модуля

Описано алгоритм комплексування мікромеханічних датчиків кутової швидкості з акселерометрами для підвищення точності безплатформової системи орієнтації низької точності, випробування його роботи на інерціальному вимірювальному модулі ADIS16354 фірми Analog Devices, а також виконання аналізу характеристик точності визначення параметрів орієнтації.The aim of the work is to describe algorithm of complexification angular velocity sensors and accelerometers for accuracy enhancement of strap down orientation system with low accuracy, testing of its work on Analog Devices inertial measurement module ADIS16354 and, also, analyzing of accuracy characteristic of orientation determination. The micromechanical inertial module ADIS16354, which has a low weight and small size and low cost, making it important to use BSO for small UAVs. This device incorporates a three-axis gyroscope and three-axis unit block accelerometers. Receiving data via SPI and transfer to USB is via module based controller MCS 51. The main computer (computer environment LabVIEW) performs: 1) receive data and decimation to 50 Hz; 2) data processing (temperature compensation and filtering the signal); 3) determine the angles of Euler-Krylov based on quaternion signal from the angular rate sensors (DKSH); 4) the initial orientation angles and correction Euler-Krylov angles to the signals from accelerometers in case of uniform rectilinear motion of the UAV. Feature of the proposed algorithm is a method for determining the BSO moments correction depending on the nature of the object and the introduction of the threshold correction. The modeling and study of the system showed that the developed system orientation can be used to determine the orientation parameters compact unmanned aerial vehicle and ensures the accuracy of the orientation parameters of ± 0,32 ° in rectilinear uniform motion of the object is sufficient accuracy to determine the orientation parameters.В статье описан алгоритм комплексирования микромеханических датчиков угловой скорости и акселерометров для повышения точности безплатформенной системы ориентации низкой точности, испытание акселерометров для повышения точности безплатформенной системы ориентации низкой точности, испытание его работы на инерциальном измерительном модуле ADIS16354 фирмы Analog Devices, а также выполнение анализа характеристик точности определения параметров ориентации

Direct nitridation synthesis and characterization of Si3N4 nanofibers

Silicon nitride nanofibers were prepared by direct nitridation of silicon powder, with an iron catalyst, under nitrogen flow. The as-prepared nanofibers have the α-Si3N4 structure. Micromorphology and phase composition of the as-prepared α-Si3N4 nanofibers were characterized by scanning and transmission electron microscopy and by X-ray diffraction analysis, respectively. The electronic structure of silicon nitride nanofibers was compared with that of Si3N4 powder by X-ray photoelectron spectroscopy and X-ray emission spectroscopy

Direct nitridation synthesis and characterization of Si3N4 nanofibers

Silicon nitride nanofibers were prepared by direct nitridation of silicon powder, with an iron catalyst, under nitrogen flow. The as-prepared nanofibers have the α-Si3N4 structure. Micromorphology and phase composition of the as-prepared α-Si3N4 nanofibers were characterized by scanning and transmission electron microscopy and by X-ray diffraction analysis, respectively. The electronic structure of silicon nitride nanofibers was compared with that of Si3N4 powder by X-ray photoelectron spectroscopy and X-ray emission spectroscopy

Decision Support Model and Visualization for Assessing Environmental Phenomena, Ecosystem Services, Policy Consequences, and Satellite Design Using Earth Observation Data

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