Method and apparatus for multiple reply rejection when decoding transponder replay signals
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United States of America Patent
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Oct 31, 1995
Grant Date -
N/A
app pub date -
Nov 16, 1993
filing date -
Nov 16, 1993
priority date (Note) -
In Force
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Importance
Abstract
Apparatus for rejecting multipath reply signals received from a target transponder within a selectable time period, comprising: a top antenna and a bottom antenna to detect reply signals; means for determining an altitude code associated with each reply signal detected by the antennas respectively; means for determining a differential time of arrival (DTA) value for each reply signal detected by the antennas respectively; and processing means for: 1) producing, for each top antenna reply signal, a top antenna target report that includes the altitude code and DTA values; 2) producing for each bottom antenna reply signal, a bottom antenna target report that includes the altitude code and DTA data; and 3) comparing each top antenna report data with corresponding data from each bottom antenna report, and marking out each bottom antenna report that is a multipath reply based on such comparison.
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