Method and system for automatic measurements of doppler waveforms
US5647366A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1996 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Sep 17, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system of processing Doppler data includes determining a noise component independently of automatic signal analysis. A succession of frequency spectra is formed in response to receiving reflected energy from an object of interest. A Doppler waveform is then derived from the succession of frequency spectra. The execution of noise estimation is limited to time periods between peaks of the Doppler waveform, providing a first level of isolation from the true-signal processing. Implementation of the noise estimation is based upon portions of the frequency spectra that are independent of the portions from which the Doppler waveform is derived. This provides a second level of isolation. The determined noise component is used as a threshold level in subsequent derivation of the Doppler waveform. Preferably, there are multiple noise thresholds that are adaptively utilized to permit application of a short search block during Doppler frequency detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.