Apparatus and method of velocity estimation
US6529850B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Feb 1, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Feb 1, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S11/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A velocity estimate is determined from a received signal by counting the number of times a signal in one multipath crosses a predetermined threshold in a given amount of time. A signal is received and a single multipath is extracted from the received signal. Instantaneous envelope values of the extracted multipath are calculated. A plurality of the instantaneous envelope values are used to calculate a running RMS value. A level crossing threshold is determined using the running RMS value. The number of times the instantaneous envelope value crosses the level crossing threshold is counted. The number of level crossings is mapped to a velocity estimate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.