Method and apparatus for multiple reply rejection when decoding

Details Method and apparatus for multiple reply rejection when decoding Method and apparatus for multiple reply rejection when decoding

1993-11-16

1995-10-31

Sotomayor, John B.

Communications: directive radio wave systems and devices (e.g.,

Radar transponder system

Navigational

342 30, 342 32, 342 38, 342 39, 342 40, G01S 1387, G01S 1376

Patent

active

054633982

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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