Narrowband signal recognition for EMI measurement
US4859933A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | Aug 22, 1989 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/001
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test method and apparatus to aid a site operator in discriminating between signals measured at different times, as well as enabling a level of automation which is appropriate using state-of-the-art instrumentation for performing EMI measurements, such as open-site EMI measurements. Preferably, discrimination between the two signals is based on the two signals being separated by at least a frequency E defined as: EQU E=2(frequency span/N)+K * RBW where: PA0 E=possible frequency error of a signal; frequency span=frequency range swept by a measuring receiver, for example, a spectrum analyzer; PA0 N=number of points measured; PA0 RBW=resolution bandwidth of a resolving bandpass filter of the measuring receiver; and PA0 K=constant less than or equal to one to account for unknown signal characteristics. With the specific application to open-site EMI measurements, preferably signals are allowed to be falsely detected as separate signals in order to take into account unknown signal characteristics, i.e., 1 RBW.fwdarw.K * RBW.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.