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() phrased the TLS problem as follows. Given a forward
modeling operator L and measured data d, assume that both are contaminated
with white noise of uniform variance; matrix N and vector n, respectively.
Then the TLS solution is obtained by minimizing the Frobenius matrix norm of the
augmented noise matrix:
| |
(125) |
subject to the constraint that the solution is in the nullspace of the combined
augmented noise and input operators:
| |
(126) |
To solve the system of equations () and (),
() introduced a technique based on the Singular Value
Decomposition (SVD). Although mathematically elegant, SVD-based approaches are
generally unrealistic for the large-scale problems that are the norm in exploration
geophysics.
Next: Equivalence with Rayleigh Quotient
Up: R. Clapp: STANFORD EXPLORATION
Previous: introduction
Stanford Exploration Project
11/11/2002