Exploració per tema "Thermosphere"

Ara es mostren els items 1-10 de 10

    • A swarm of femtosatellites for lower thermospheric density determination. 

      Lledó Ardila, Carlos (Universitat Politècnica de Catalunya, 2015-07-30)
      Projecte Final de Màster Oficial
      Accés obert
      The Lower thermosphere (between 80 and 350 km) is quite badly known due to the scarcity of satellites in this region. Nevertheless, it is an important region in several respects. Firstly, because its density determines ...

    • An analysis of the thermospheric drag upon 3U CubeSats 

      Martínez Calzado, Adrián (Universitat Politècnica de Catalunya, 2023-07-13)
      Projecte Final de Màster Oficial
      Accés obert
      Accurate drag modelling is crucial for satellite operations and re-entries in low-Earth orbit (LEO). A proper treatment of this problem becomes increasingly important as the number of artificial satellites grows. However, ...

    • Analysis and selection of a MEMS, multi-constellation GNSS receiver for a femtosatellite 

      Guerra Mentruit, Alejandro (Universitat Politècnica de Catalunya, 2020-02-14)
      Treball Final de Grau
      Accés obert
      Context: The expansion of space applications and their liberalization is an actual fact since the last decade. Small satellites are developed either by academic institutions and private companies. The concept of femtosatelites, ...

    • Design of a femto-satellite for high-altitude thermospheric studies 

      Moschtaq, Mohammad Raschiq (Universitat Politècnica de Catalunya, 2021-02-12)
      Projecte Final de Màster Oficial
      Accés obert
      This work deals with the design of a femto-satellite for scientific studies. The goal of the femto-satellite is to model the density of the thermosphere by measuring the orbital decay caused by atmospheric drag. The proposed ...

    • Determination of drag coefficients in a free molecular flow 

      Minguell Montes, Bernat (Universitat Politècnica de Catalunya, 2018-07-20)
      Treball Final de Grau
      Accés obert
      This project aims to study the drag coefficient (CD) for satellites in a free molecular flow. The study is mainly based on Schaaf & Chambre and Schamberg models. These are old models (from 1958), but still are the most ...

    • Determination of the along-orbit average density of the thermospere 

      Martínez Calzado, Adrián (Universitat Politècnica de Catalunya, 2020-09-14)
      Treball Final de Grau
      Accés obert
      Nowadays, the study of the dynamics of the upper atmosphere has become a must in order to study satellite trajectories at low orbit with accuracy. The region we are interested in this project is the lower part of the ...

    • Effects of the lower thermosphere on the re-entry of space Debris 

      Bonet Manzanares, Mar (Universitat Politècnica de Catalunya, 2021-02-12)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Nowadays a large number of artificial satellites orbit the Earth, of which many of them have completed their mission or are fragments of satellites that travel without any purpose. These objects can pose a collision problem ...

    • Further evidence of the long-term thermospheric density variation using 1U CubeSats 

      Martínez, Adrián; Lledó Ardila, Carlos; Gutiérrez Cabello, Jordi; Gil Pons, Pilar (Universitat Politècnica de Catalunya, 2022-04-29)
      Comunicació de congrés
      Accés obert
      Faculty members, undergraduate and graduate students of the School of Communication and Aerospace Engineering (Polytechnical University of Catalonia) are participating in a series of studies to determine the thermospheric ...

    • Mission analysis for a swarm of femtosatellites to study the lower thermosphere 

      Aidynbay, Nurmakhan (Universitat Politècnica de Catalunya, 2020-02-14)
      Projecte Final de Màster Oficial
      Accés obert
      The lower thermosphere (between 100 and 250 km) is badly known due to the scarcity of operating satellites in this region. Nevertheless, it is very relevant for the study of Earth-Sun relations, satellite re-entry ...

    • Orbit reconstruction using GNSS-derived state vectors 

      Martínez Galisteo, María (Universitat Politècnica de Catalunya, 2021-09-08)
      Treball Final de Grau
      Accés obert
      The lower thermosphere (between 100 and 550 km of height) is known with lesser accuracy than desired. The use of spherical satellites to determine the density could result in a substantial improvement of the present ...