isce3::core::NFFTKernel< T > Class Template Reference

NFFT time-domain kernel. More...

#include <Kernels.h>

Inheritance diagram for isce3::core::NFFTKernel< T >:

Public Member Functions
	NFFTKernel (int m, int n, int fft_size)
	Constructor of NFFT kernel.
T	operator() (double x) const override
	Evaluate kernel at given location in [-halfwidth, halfwidth].
Public Member Functions inherited from isce3::core::Kernel< T >
	Kernel (double width)
virtual	~Kernel ()
	Virtual destructor (allow destruction of base Kernel pointer)
double	width () const
	Get width of kernel.

Additional Inherited Members
Public Types inherited from isce3::core::Kernel< T >
using	value_type = T
Protected Attributes inherited from isce3::core::Kernel< T >
double	_halfwidth

Detailed Description

template<typename T>
class isce3::core::NFFTKernel< T >

NFFT time-domain kernel.

This is called \( \phi(x) \) in the NFFT papers [keiner2009] , specifically the Kaiser-Bessel window function. The domain is scaled so that usage is the same as other ISCE kernels, e.g., for x in [0,n) instead of [-0.5,0.5).

Constructor & Destructor Documentation

NFFTKernel()

template<typename T>

isce3::core::NFFTKernel< T >::NFFTKernel	(	int	m,
		int	n,
		int	fft_size )

Constructor of NFFT kernel.

Parameters

[in]	m	Half kernel size (width = 2*m+1)
[in]	n	Length of input signal.
[in]	fft_size	FFT Transform size (> n).

Member Function Documentation

operator()()

template<typename T>

T isce3::core::NFFTKernel< T >::operator() ( double x ) const

overridevirtual

Evaluate kernel at given location in [-halfwidth, halfwidth].

Implements isce3::core::Kernel< T >.

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The documentation for this class was generated from the following files:

• /home/runner/work/isce3/isce3/cxx/isce3/core/forward.h
• /home/runner/work/isce3/isce3/cxx/isce3/core/Kernels.h
• /home/runner/work/isce3/isce3/cxx/isce3/core/Kernels.icc