Sökning: "EISCAT"
Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet EISCAT.
1. From meteors to space safety : dynamical models and radar measurements of space objects
Sammanfattning : Every day the Earth's atmosphere is bombarded by 10-200 metric tons of dust-sized particles and larger pieces of material from space called meteoroids. Dust and meteoroids come from parent bodies such as comets and asteroids, which are remnants from the formation of the solar system. LÄS MER
2. Auroral and meteor applications of the EISCAT incoherent scatter radar
Sammanfattning : .... LÄS MER
3. Radio meteors above the Arctic Circle : radiants, orbits and estimated magnitudes
Sammanfattning : This thesis presents results based on data collected with the 930 MHz EISCAT UHF radar system and three SKiYMet specular meteor radars. It describes in detail a method for meteoroid orbit calculation. The EISCAT UHF system comprises three identical 32 m parabolic antennae: one high-power transmitter/receiver and two remote receivers. LÄS MER
4. High-resolution meteor exploration with tristatic radar methods
Sammanfattning : A meteor observed with the naked eye is colloquially called a shooting star. The streak of light is generated by an extra-terrestrial particle, a meteoroid, entering the Earth’s atmosphere. The term meteor includes both luminosity detectable by optical means and ionization detectable by radar. LÄS MER
5. Beamforming and timing design issues for a large aperture array radar applied to atmospheric research
Sammanfattning : This thesis describes the work done by the author during the development of a Large Aperture Array Radar (LAAR) receiver for the EISCAT 3D project. The main focus was on digital beamforming of a bandpass-sampled wide band signal in base-band and the development of a picosecond-level distributed timing system applicable over hundreds of meters. LÄS MER