Communications: directive radio wave systems and devices (e.g. – Aircraft collision avoidance system – With transponder
Reexamination Certificate
2006-03-21
2006-03-21
Gregory, Bernarr E. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Aircraft collision avoidance system
With transponder
C342S029000, C342S030000, C342S036000, C342S037000, C342S042000, C342S043000, C342S051000
Reexamination Certificate
active
07015856
ABSTRACT:
A Mode-S transponder is provided for detecting synchronization phase reversal (SPR) signals. The transponder includes a receiver for receiving a Mode-S signal that contains a P6 pulse having a Mode-S data segment and an SPR signal therein. The transponder also includes a phase detector that detects a phase change between first and second states in the received Mode-S signal. The phase detector includes an SPR qualifier that determine whether, following a state change, the Mode-S signal remains at one of the first and second states for at least a predetermined minimum time sufficient to qualify as a detector enable signal.
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Garmin International, Inc.
Gregory Bernarr E.
Terrell David L.
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