Sökning: "GNSS"
Visar resultat 11 - 15 av 47 avhandlingar innehållade ordet GNSS.
11. Secure GNSS-based Positioning and Timing : Distance-Decreasing attacks, fault detection and exclusion, and attack detection with the help of opportunistic signals
Sammanfattning : With trillions of devices connected in large scale systems in a wired or wireless manner, positioning and synchronization become vital. Global Navigation Satellite System (GNSS) is the first choice to provide global coverage for positioning and synchronization services. LÄS MER
12. GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere
Sammanfattning : GNSS Radio Occultation (GNSS-RO) is an opportunistic Earth sensing technique where GNSS signals passing through the atmosphere are received in low Earth orbit and processed to extract meteorological parameters. As signals are received along an orbit, the measured Doppler shift is transformed to a bending angle profile (commonly referred to as bending angle retrieval), which, in turn, is inverted to a refractivity profile. LÄS MER
13. Effects of Small-Scale Ionospheric Irregularities on GNSS Radio Occultation Signals : Evaluations Using Multiple Phase Screen Simulator
Sammanfattning : Radio Occultation (RO) is a remote sensing technique which uses Global Navigation Satellite System (GNSS) signals tracked by a Low-Earth Orbit (LEO) satellite to sound the earth's atmosphere both in low (troposphere, stratosphere) and high (ionosphere) altitudes. GNSS-RO provides global coverage and SI traceable measurements of atmospheric data with high-vertical resolution. LÄS MER
14. Algorithm development for multistatic GNSS radar technology
Sammanfattning : Bistatic GNSS radar has received increased attention in recent years within both the radar and the GNSS communities. Its major advantages are that it has complete earth coverage and that more information is available due to the geometric diversity of the transmitters. LÄS MER
15. Optimal Design in Geodetic GNSS-based Networks
Sammanfattning : An optimal design of a geodetic network helps the surveying engineers maximise the efficiency of the network. A number of pre-defined quality requirements, i.e. precision, reliability, and cost, of the network are fulfilled by performing an optimisation procedure. LÄS MER