G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 13/78 (2006.01) G01S 13/76 (2006.01) G01S 13/80 (1990.01)
Patent
CA 2114545
An SSR reply decoding system for separating pulse codes of a series of closely- spaced or overlapping SSR replies is dis- closed. A delay line (11) is connected to receive pulses representing the leading edge of each SSR reply code pulse. The delay line (11) has a length corresponding to at least two bracket lengths of an SSR reply. A bracket decoder (12) is connected to respective taps (F1, F2) of the delay line (11) for determining the beginning and end of a first SSR reply. A phantom reply detector (11) 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 (13) 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.
Stein Robert H.
Verbeke Charles E. Jr.
Cardion Newco Inc.
Fetherstonhaugh & Co.
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