摘要:

AbstractData processing is an important tool in airspace surveillance and air traffic control today. In this paper the problem is treated how to reconstruct a flown trajectory from its correlated radar plots subject to a certain knowledge of the aircraft manoeuverability and the radar measurement statistics. A variational approach leads to a generalized smoothing spline method. Simulation results are presented.

ISSN:0170-4214    

DOI:10.1002/mma.1670040132

出版商:John Wiley&Sons, Ltd    

年代:1982

数据来源: WILEY

摘要:

AbstractIn the paper a boundary value problem is studied for the equation of mixed typek(y)uxx+uyy+r(x, y)u=f(x, y)in the rectangular domain {(x, y)| −1

ISSN:0170-4214    

DOI:10.1002/mma.1670040133

出版商:John Wiley&Sons, Ltd    

年代:1982

数据来源: WILEY

摘要:

AbstractFor singularly perturbed one‐dimensional convection‐diffusion equations, finite element approximations are constructed based on a so‐called approximate symmetrization of the given unsymmetric problem. Local a‐posteriori error estimates are established with respect to an appropriate energy norm where the bounds are proved to be realistic. The local bounds, called error indicators, provide a basis for a self‐adaptive mesh refinement. For a model problem numerical results are presented showing that the adaptive method detects and resolves the bound

ISSN:0170-4214    

DOI:10.1002/mma.1670040134

出版商:John Wiley&Sons, Ltd    

年代:1982

数据来源: WILEY

摘要:

AbstractNew condition numbers and stability constants for the numerical behaviour of Cramer's rule and Gaussian elimination for solving two linear equations in two unknowns under data perturbations and rounding errors of floating‐point arithmetic are established. By these means fundamental error estimates and stability theorems are proved. The error estimates are illustrated by a series of numerical example

ISSN:0170-4214    

DOI:10.1002/mma.1670040135

出版商:John Wiley&Sons, Ltd    

年代:1982

数据来源: WILEY

ISSN:0170-4214    

DOI:10.1002/mma.1670040101

出版商:John Wiley&Sons, Ltd    

年代:1982

数据来源: WILEY