Calibration method and apparatus for receiving transponder reply signals
US5469172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Nov 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/933
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Calibration apparatus for an antenna/receiver system having, in combination, means for receiving one or more electromagnetic data encoded signals from a transmitter and producing in response to each data signal two signals having a phase relationship, the receiving means comprising an antenna; signal processing means for using the phase relationship to determine information related to the data signals; and means for coupling a calibration signal into the antenna to produce two calibration signals having a known phase relationship; the signal processing means using the known phase relationship to compensate for phase errors when processing the data signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.