Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Spherical basis function approximation with particular trend functions
Segeth, Karel
The paper is concerned with the measurement of scalar physical quantities at nodes on the $(d-1)$-dimensional unit sphere surface in the hbox{$d$-dimensional} Euclidean space and the spherical RBF interpolation of the data obtained. In particular, we consider $d=3$. We employ an inverse multiquadric as the radial basis function and the corresponding trend is a polynomial of degree 2 defined in Cartesian coordinates. We prove the existence of the interpolation formula of the type considered. The formula can be useful in the interpretation of many physical measurements. We show an example concerned with the measurement of anisotropy of magnetic susceptibility having extensive applications in geosciences and present numerical difficulties connected with the high condition number of the matrix of the system defining the interpolation.
Comparison Of Promising Tdoa Geolocation Algorithms For Low-Power Wide-Area Network
Pospíšil, Jan
The paper deals with the comparison of promising end-device geolocation algorithms in a multipath propagation environment using the Time-Difference of Arrival (TDoA) information, that is incoming signal propagation delays from the end-device to the gateways. Comparison by simulation with added noise to outline the real conditions for a variety of selected computational algorithms. Namely comparison of the sensitivity of the algorithms to noise, the influence of the gateway count on the positioning error and calculation time requirements have been done.

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