Communications: directive radio wave systems and devices (e.g. – Air traffic control – Secondary surveilance radar
Patent
1991-07-30
1993-06-15
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Air traffic control
Secondary surveilance radar
342159, G01S 1376, G01S 1380
Patent
active
052203298
ABSTRACT:
An SSR reply decoding system for separating pulse codes of a series of closely-spaced or overlapping SSR replies is disclosed. A delay line is connected to receive pulses representing the leading edge of each SSR reply code pulse. The delay line has a length corresponding to at least two bracket lengths of an SSR reply. A bracket decoder is connected to respective taps of the delay line for determining the beginning and end of a first SSR reply. A phantom reply detector is connected to the remaining taps for inhibiting the bracket decoder when two replies are represented by pulses in the delay lines, one of the replies having a pulse space from the pulse of another reply equal to a framing pulse period for an SSR reply. The phantom reply detector therefore inhibits the detection of phantom replies. As a discriminate for determining when pulses having the spacing of a framing period belong to different replies, azimuth data is provided which will permit discrimination of these phantom conditions.
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Stein Robert H.
Verbeke, Jr. Charles E.
Cardion, Inc.
Sotomayor John B.
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