Temat: CubeSat - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Laboratory investigations of sub-meter resolution telescope with segmented aperture dedicated to CubeSat platform
Autorzy:: Knapkiewicz, Paweł
Janisz, Tymon
Charytoniuk, Grzegorz
Partyka, Michał
Pozniak, Tomasz
Stefanow, Damian
Chołodowski, Jakub
Tematy:: segmented optics
CubeSat
satellite
Earth observations; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/59112959.pdf Link otwiera się w nowym oknie
Opis:: In current CubeSat observation satellites, the main design constraint is the available space. Standards dictating the unit dimensions of the payload severely restrict the maximum aperture and focal length of the optical instrument. In this paper, the authors present the results of work to produce a novel DeploScope optical system for a CubeSat-type observation satellite with a segmented aperture of the primary mirror deployed in space. The telescope is designed for Earth observation and is expected to find its application in the military, precision agriculture or environmental disaster prevention. The work includes a detailed analysis of the segment aperture effect on image repeatability for different numbers of main mirror segments. Based on it, the optimal configuration of the optical model of the telescope with an aperture of 188.5 mm and a focal length of 1100 mm was selected. Based on this analysis, a so-called laboratory version of the telescope was built, providing the possibility of free correction of each segment of the primary mirror while maintaining a solid stable base for other components of the module. Imaging tests were carried out on the laboratory version of the instrument and the system was optimized for a version suitable for implementation in the payload structure of the microsatellite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Metoda tworzenia modelu ziemskiego pola magnetycznego zoptymalizowanego dla obserwatora orientacji satelity
Method for creating earths magnetic field model optimized for satellite attitude observer
Autorzy:: Zagórski, P.
Tematy:: ziemskie pole magnetyczne
satelita
model
CubeSat
Earth's magnetic field
satellite; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Powiązania:: https://bibliotekanauki.pl/articles/158761.pdf Link otwiera się w nowym oknie
Opis:: Jedna z metod określania orientacji przestrzennej małych satelitów orbitujących wokół Ziemi polega na jej odtwarzaniu poprzez porównywanie pomiarów pola magnetycznego oraz kierunku położenia słońca z odpowiednimi modelami. By było możliwe wykonywanie tego zadania w czasie rzeczywistym, modele takie muszą być wystarczająco dokładne, a jednocześnie nie mogą być zbyt kosztowne obliczeniowo. Niniejszy artykuł przedstawia sposób tworzenia dedykowanego modelu pola magnetycznego Ziemi, powstały przez redukcję bardziej złożonego jego odwzorowania. Rozwiązanie to zapewnia możliwość elastycznego dostosowania wymaganej dokładności przy jednoczesnej redukcji kosztu obliczeniowego.
One of the methods of determining orientation of a small satellite orbiting Earth is based on recreating spacecraft's orientation from comparison of measured magnetic field vector and Sun position with their respective models. To achieve this in real-time regime it is necessary that those models have sufficient precision and are relatively easy to compute. In this paper a methodology of creating Earth magnetic field model will be proposed. It will be shown that by reducing more complex model and optimizing its parameters it is possible to achieve adjustable precision with simultaneous reduction of computational cost.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Transient Thermal Analysis of 1U Modular Cubesat Based on Passive Thermal Control System
Autorzy:: Kubade, Sunidhi
Kulkarni, Shruti
Dhatrak, Pankaj N.
Tematy:: CubeSat
transient thermal analysis
passive thermal control
thermal strap
MLI; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110750.pdf Link otwiera się w nowym oknie
Opis:: Cube Satellites are miniaturized satellites used for space research with a mass of not more than 1.33 kg per unit. They are widely used in space applications because of its low cost of manufacturing and flexibility of applications. Since, they use commercial off-the-shelf components, thermal consideration of internal components of 1-unit cube satellites becomes a necessity. In this paper, transient thermal analysis of a 1-unit cube satellite is conducted to analyze its behavior during the first 29 seconds of orbit insertion from the launch vehicle. Transient thermal analysis yielded a temperature range that exceeded the optimum limit. As a result, to reduce heat dissipation, two main types of thermal management systems for satellites: active control and passive control systems are included. To maintain critical components at their operating temperature, a passive thermal control is implemented. Thermal strap and multi-layer insulation are used to analyze internal components of 1-unit cube satellite. Using graphite fiber thermal strap and aerogel multi-layer insulation for internal components, the 1-unit modular cube satellite is found to be more suitable under low earth orbit conditions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Zakłócenia radiowe powodowane przez stacje radarowe Woroneż-DM (Воронеж-ДМ, 77Я6ДМ)
Radio interference caused by Voronezh-DM radar
Autorzy:: Marsz, Jędrzej
Skrzypkowski, Paweł
Tematy:: cubesat
Voronezh-DM
UHF, 437MHz
PW-Sat3
zakłócenia radiowe
radio interferences; Pokaż więcej
Wydawca:: Fundacja PSC
Powiązania:: https://bibliotekanauki.pl/articles/41534957.pdf Link otwiera się w nowym oknie
Opis:: As a part of preparations for setting the ground station for the planned PW-Sat3 student satellite, analysis of the spectrum in the 70cm band was made in Gdynia region by members of the science club. It was found out that very strong radio interference is present in this band. Interference was pinpointed to Voronezh-DM radar installed in about 2013 by the Russian military in the Kaliningrad Oblast. Measurements were made to determine the strength and characteristics of the signals emitted by this radar. The signal level in Gdynia region somewhat depends on propagation, but is always present, making receiving weak satellite signals difficult or impossible. Additionally, the potential effects of radar on signals received by satellite was analyzed. Evidence of problems in communications, which might originate from Voronezh-DM radar, in this frequency range in previous satellite missions was found and presented. Other Voronezh-DM radars in other parts of the globe are present, and although operating on slightly different frequencies might also influence satellite communication in the 70cm band.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Simulation of the proposed combined Fuzzy Logic Control for Maximum Power Point Tracking and Battery Charge Regulation used in CubeSat
Autorzy:: Seddjar, Abderrahmane
Kerrouche, Kamel Djamel Eddine
Wang, Lina
Tematy:: combined Fuzzy Logic Control
Electrical Power System
photovoltaic system
Maximum Power Point Tracking
Battery Charge Regulation
Perturb and Observe
CubeSat; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/141115.pdf Link otwiera się w nowym oknie
Opis:: One of the most critical systems of any satellite is the Electrical Power System (EPS) and without any available energy, the satellite would simply stop to function. Therefore, the presented research within this paper investigates the areas relating to the satellite EPS with the main focus towards the CubeSat platform. In this paper, an appropriate EPS architecture with the suitable control policy for CubeSat missions is proposed. The suggested control strategy combines two methods, the Maximum Power Point Tracking (MPPT) and the Battery Charge Regulation (BCR), in one power converter circuit, in order to extract the maximum power of the Photovoltaic (PV) system and regulate the battery voltage from overcharging. This proposed combined control technique is using a Fuzzy Logic Control (FLC) strategy serving two main purposes, the MPPT and BCR. Without an additional battery charger circuit and without switching technique between the two controllers, there are no switching losses and the efficiency of the charging characteristic can be increased by selecting this proposed combined FLC. By testing a space-based PV model with the proposed EPS architecture, some simulation results are compared to demonstrate the superiority of the proposed control strategy over the conventional strategies such as Perturb and Observe (P&O) and FLC with a Proportional Integral Derivative (PID) controller.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Prace Instytutu Elektrotechniki, zeszyt 260 : Praca zbiorowa
Współwytwórcy:: Instytut Elektrotechniki w Warszawie, Red.
Tematy:: Publikacje darmowe; Pokaż więcej
Dostawca treści:: IBUK Libra

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