Signal pre-processing for estimating attributes of a transmission line
US6909978B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2003 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | Dec 29, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/11
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In the process of estimating attributes of a transmission line from reflectometry measurements, small yet important reflections may be drowned in the immediate reflected signal owing to the mismatch between the reference impedance with respect to which the 1-port scattering parameter of the line has been determined and the characteristic impedance of the line.The major part of the near-end reflections are eliminated by estimating the characteristic impedance of the line, and by converting the 1-port scattering parameter of the line from the reference impedance base to the estimated characteristic impedance base.However, there is still a residual influence of the near-end reflections. It is then highly necessary to determine a time zone wherein the residual near-end reflections are enclosed so as their contribution is further neutralized in the process of estimating attributes of the transmission line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.