Demodulation method
AssigneeKROHNE Messtechnik GmbH
InventorKai GOSSNER
Life of this patent
Estimating the term…
Abstract
A demodulation method for a pseudo-heterodyne signal, wherein the pseudo-heterodyne signal has a phase-modulated carrier signal and the pseudo-heterodyne signal is digitally sampled. A demodulation method at least partially avoids the disadvantages known from the prior art is implemented according to the invention in that the digitally sampled pseudo-heterodyne signal is subjected to a discrete Fourier transformation and at least one output Fourier coefficient featuring an amplitude and a phase is determined, an atan 2 function (11) is applied on exactly one output Fourier coefficient of the discrete Fourier transformation and the atan 2 function (11) provides the phase of the one output Fourier coefficient as a result.
Claims14
Demodulation method for a pseudo-heterodyne signal, comprising the steps of:
- digitally sampled a pseudo-heterodyne signal having a phase-modulated carrier signal,
- subjecting the digitally sampled pseudo-heterodyne signal to a discrete Fourier transformation,
- determining at least one output Fourier coefficient featuring an amplitude and phase,
- applying an atan 2 function to exactly one output Fourier coefficient of the discrete Fourier transformation, and
- obtaining the phase of the one output Fourier coefficient from the atan 2 function.
Dependencies are inferred from the claim text.