Sökning: "downward continuation"

Hittade 5 avhandlingar innehållade orden downward continuation.

  1. 1. Geoid determination over Ethiopia with emphasis on downward continuation of gravity anomailes

    Författare :Addisu Hunegnaw; KTH; []
    Nyckelord :geoidal height; modified stokes formula; downward continuation; phillips-tikhonov regularization; wavelet analysis; lateral density variations;

    Sammanfattning : .... LÄS MER

  3. 2. Regional Geoid Determination Methods for the Era of Satellite Gravimetry : Numerical Investigations Using Synthetic Earth Gravity Models

    Författare :Jonas Ågren; Lars E. Sjöberg; Zdenek Martince; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; geoid determination; GOCE; synthetic earth gravity models; kernel modification; downward continuation; Geovetenskap; Earth sciences; Geovetenskap;

    Sammanfattning : It is the purpose of this thesis to investigate different regional geoid determination methods with respect to their feasibility for use with a future GOCE satellite-only Earth Gravity Model (EGM). This includes investigations of various techniques, which involve different approximations, as well as the expected accuracy. LÄS MER

  4. 3. An Isostatic Earth Crustal Model : and Its Applications

    Författare :Mohammad Bagherbandi; Lars E. Sjöberg; Martinec Zdeněk; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crustal thickness; inverse isostatic problem; isostasy; isostatic compensation; Moho depth; Moho density contrast; downward continuation; Earth sciences; Geovetenskap;

    Sammanfattning :  The Mohorovičič discontinuity (Moho), which is the surface separating the Earth’s crust from the mantle, is of great interest among geoscientists. The Moho depth can be determined by seismic and gravimetric methods. LÄS MER

  5. 4. On Satellite Gravity Gradiometry

    Författare :Mehdi Eshagh; Lars Erik Sjöberg; Zdenek Martinec; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; satellite orbit; atmosphric desity model; lateral density variation; validation downward continuation; joint inversion; ring modification; Earth sciences; Geovetenskap;

    Sammanfattning : .... LÄS MER

  7. 5. Integrated millimeter Wave CMOS Power Amplifiers for 5G Systems

    Författare :Christian Elgaard; Integrerade elektroniksystem; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The anticipated continuation of the last three decades of growth of global demand for high-speed high-coverage mobile data, calls for massive investments in cellular infrastructure, for the ongoing roll out of the fifth generation of mobile systems, but also later for the sixth generation. A key enabler, for the high-speed part, is for the cellular system to move up in frequency and support communication at millimeter-wave (mmW) frequencies (24 – 70 GHz), where available wideband spectrum exist. LÄS MER