Method for determining the frequency of a signal
US6351505B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1998 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Oct 13, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/167
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining a frequency of a signal includes transforming the analog signal to the complex frequency range through a digital filtering, preferably a FFT, so that result vectors with amplitude and phase components are generated in the frequency range. As a result, a continuous sequence of transformation intervals (FFT intervals) develops within a measuring interval that can be predetermined. Subsequently, pairs of result vectors, which belong to the same predetermined frequency, are selected from predetermined transformation intervals (FFT intervals). Associated phase differences are then formed from which a weighted phase difference is determined. The weighted phase difference is used to correct the signal frequency determined from the amplitude spectrum. This method permits very accurate frequency measuring, especially for pulsed HF signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.