Sökning: "Low Earth Orbit LEO"

Visar resultat 6 - 10 av 22 uppsatser innehållade orden Low Earth Orbit LEO.

  1. 6. Positioning in Non-Terrestrial Networks

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Soha Emara; [2021]
    Nyckelord :positioning; 5G; satellite; NTN; Technology and Engineering;

    Sammanfattning : In 5G communications, Non-terrestrial Network (NTN) is envisioned to complement Terrestrial Network (TN) to increase network availability, scalability and continuity. Positioning of User Equipment (UE) is critical for the operation of NTN. Currently, NTN uses Global Navigation Satellite System (GNSS) for positioning. LÄS MER

  3. 7. Simulation of Precise Automatic Radio Frequency GroundStation Tracking For S-Band Satellites

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Akila Wajirakumara; [2021]
    Nyckelord :;

    Sammanfattning : Satellites are often known for possessing invariable motion causing its apparent position to drift in the sky from the perspective of a ground station. If these irregular drifts are not compensated, the performance of the communication link would be greatly affected. Hence, the satellite motion has to be tracked by the ground station antenna. LÄS MER

  4. 8. Error Injection Study for a SpaceFibre In-Orbit Demonstrator

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Carlos Abad Garcia; [2020]
    Nyckelord :;

    Sammanfattning : The space electronics sector is shifting towards the New-Space paradigm, in which traditional space-quali_ed and expensive components and payloads are replaced by commercial o_-the-shelf (COTS) alternatives. This change in mentality is accompanied by the development of inexpensive cubesats, lowering the entry barrie in terms of cost, enabling an increase in scienti_c research in space. LÄS MER

  5. 9. Comparison of Control Approaches for Formation Flying of Two Identical Satellites in Low Earth Orbit

    Master-uppsats, KTH/Rymdteknik

    Författare :Hasan Basaran; [2020]
    Nyckelord :Aerospace; Chief; Control; Deputy; Feedback Linearization; Follower; Formation Flight; Fuel Consumption; Guidance; Leader; Model Predictive Control; Relative Orbit; Rendezvous; Sliding Mode.;

    Sammanfattning : Formation flying of satellites describes a mission in which a set of satellites arrange their position with respect to one another. In this paper, satellite formation flying guidance and control algorithms are investigated in terms of required velocity increment Delta-v, and tracking error for a Chief/Deputy satellite system. LÄS MER

  7. 10. Global IoT Coverage Through Aerial And Satellite Network

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Faizan Ahmed; [2020]
    Nyckelord :Satellite; aerial platform; IoT; network architecture; environment monitoring; smart agriculture; tracking of shipping container.; Satellit; flygplattform; IoT; nätverksarkitektur; miljöövervakning; smart jordbruk; spårning av fraktcontainer.;

    Sammanfattning : Internet of Things (IoT) and Machine Type Communication (MTC) have got more momentum in the last few years but still, need to be penetrated with their full swing in our daily life. This can be possible with general framework that provides global network coverage. LÄS MER