Mode 5 detection process using phase and amplitude correlation

Details Mode 5 detection process using phase and amplitude correlation Mode 5 detection process using phase and amplitude correlation

G - Physics

01

S

G01S 13/74 (2006.01) G08G 5/00 (2006.01) H03M 13/13 (2006.01)

Patent

CA 2737574

A receiver (22) in a mode 5 air traffic control system (20) provides amplitude and phase signal outputs a digital data stream containing preamble and flight information from data transmitted from an aircraft. A signal splitter (24) divides the amplitude and phase signal outputs between an odd channel (26) and an even channel (28) that carry odd-numbered pulses and even-numbered pulses, respectively. An odd channel data decoder (32) connected to the signal splitter (24) extracts signals encoded in the odd channel (26) and forms an odd data stream and an even channel data decoder (26) connected to the signal splitter extracts signals encoded in the even channel (28) and forming an even data stream. A preamble correlator (38) correlates the odd and even data streams with a predefined preamble mask to detect potential valid preambles, and preamble decision logic processes (48) signals output from the preamble correlator (38) to identify which of the preambles actually are actually valid.

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