Quasi-logarithmic frequency resolution approach in DFT based spectral estimation

We propose an elaboration and visualization approach for spectral measurement that allows to monitor the progress of the estimation process in real time while maintaining a quaqi-constant resolution bandwidth over frequency ratio in a wide frequency range. The approach we propose is particularly useful in the estimation of low frequency noise, where the flicker component is dominant, since it allows to immediately recognize the presence of systematic errors due to insufficiently small resolution bandwidth and to optimize the measurement time based on the detailed shape of the spectrum as it unveils during the estimation process.