Sökning: "radio wave propagation models"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden radio wave propagation models.

  1. 1. Presence detection by means of RF waveform classification

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Max Lengdell; [2022]
    Nyckelord :presence detection; machine learning; radio wave classification; unsupervised learning; supervised learning; sensor fusion; unsupervised classification;

    Sammanfattning : This master thesis investigates the possibility to automatically label and classify radio waves for presence detection, where the objective is to obtain information about the number of people in a room based on channel estimates. Labeling data for machine learning is time consuming and tedious process. To address this two approaches are evaluated. LÄS MER

  3. 2. An evaluation of coverage models for LoRa

    Kandidat-uppsats, Jönköping University/JTH, Avdelningen för datateknik och informatik

    Författare :Felix Paulsson; Issa Bitar; [2021]
    Nyckelord :LoRa; LoRaWAN; IoT; Empirical models; Path loss; Attenuation; Coverage;

    Sammanfattning : LoRaWAN is a wireless network technology based on the LoRa modulation technology. When planning such a network, it is important to estimate the network’s coverage, which can be done by calculating path loss. To do this, one can utilize empirical models of radio wave propagation. LÄS MER

  4. 3. Optimisation of flat dielectric lenses using an interior point method

    Master-uppsats, Linköpings universitet/Tillämpad matematik; Linköpings universitet/Tekniska fakulteten

    Författare :Jonatan Ek; [2021]
    Nyckelord :Lens; Permittivity; Optimisation; Interior Point Method; Wave Propagation;

    Sammanfattning : This thesis aims to study how flat dielectric lenses can be designed. The usage of flat lenses is steadily increasing as they are smaller and less bulky than traditional convex lenses. Instead of a lens with a curved surface the permittivity in the lens is varied to achieve the same effect. LÄS MER

  5. 4. Wave Propagation Models in the Troposphere for Long-Range UHF/SHF Radio Connections

    Master-uppsats, Karlstads universitet

    Författare :Tim Lindquist; [2020]
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  7. 5. On the Influence of Scattering From a Power-pole on an Airport Radar

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

    Författare :Ao Hu; [2019]
    Nyckelord :Power-pole; VOR System; Airplane; EFIE; MOM; RWG; Scattering.; Kraftstolpar; VOR Systemet; flygplan; EFIE; MoM; RWG; Spridning;

    Sammanfattning : Power-poles are one of the common massive conducting structures in cities and countryside. To fulfill the remarkable increased electric power demand nowadays, the number and the size of power-poles are also growing over the past few decades. LÄS MER