Calibration method and apparatus for receiving transponder reply signals
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United States of America Patent
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Nov 21, 1995
Grant Date -
N/A
app pub date -
Nov 16, 1993
filing date -
Nov 16, 1993
priority date (Note) -
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status (Latency Note)
Importance
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.
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