Demodulation method

摘要

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 atan2 function (11) is applied on exactly one output Fourier coefficient of the discrete Fourier transformation and the atan2 function (11) provides the phase of the one output Fourier coefficient as a result.

主权项

1. Demodulation method for a pseudo-heterodyne signal, comprising the steps of:
digitally sampling 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 atan2 function to exactly one output Fourier coefficient of the discrete Fourier transformation, and obtaining the phase of the one output Fourier coefficient from the atan2 function, wherein the pseudo-heterodyne signal is created during m oscillations of the carrier signal, the pseudo-heterodyne signal is sampled with an m*n-fold frequency of the carrier signal, m being a natural number greater than zero, n being a natural number greater than one and the discrete Fourier transformation being carried out over m*n sampling steps.