getDeltaBLI
Exact BLI of an arbitrarily positioned delta function.
Syntax
f = getDeltaBLI(Nx, dx, x, x0)
Description
getDeltaBLI calculates the exact BLI of an arbitrarily positioned delta function. For grid dimensions with an evenly-sampled periodicity, a small Nyquist frequency sinusoid is added. This sinusoid is invisible on grid samples and has zero amplitude when the delta function lies on a grid node. It is important when the evaluation points aren't grid nodes, and when the delta function is off-grid. It serves to ensure conjugate symmetry in the BLI's Fourier transform.
Inputs
Nx |
Number of grid points in the relevant Cartesian direction |
dx |
Grid point spacing [m] |
x |
Coordinates at which the BLI is evaluated [m] |
x0 |
Coordinate at which the BLI is centred [m] |
Outputs
f |
Value of the BLI at the specified coordinates |
See Also
getBLI