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MODE S TRANSPONDER TRANSMISSION SIGNAL DECODER AND MODE S TRANSPONDER TRANSMISSION SIGNAL DECODING METHOD

  • US 20080106456A1
  • Filed: 12/19/2007
  • Published: 05/08/2008
  • Est. Priority Date: 12/03/2004
  • Status: Active Grant
First Claim
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1. A Mode S transponder transmission signal decoder for decoding a Mode S transponder transmission signal transmitted by a transponder mounted on an aircraft, comprising:

  • a differential processing unit which performs differential processing for the Mode S transponder transmission signal;

    an auto correlation arithmetic operation unit which performs an arithmetic operation of a degree of auto correlation between an increasing change rate and decreasing change rate of a power level in the signal which has been subjected to the differential processing;

    a pulse regeneration unit which specifies a position of a pulse in the signal which has been subjected to the auto correlation arithmetic operation processing and regenerates the pulse based on the degree of auto correlation and a standard of a Mode S signal, the degree having been obtained by the auto correlation arithmetic operation processing;

    a pattern selection unit which selects a pattern of the pulse, the pattern most closely resembling a pattern of the regenerated pulse, from patterns of pulses defined by the standard of the Mode S signal;

    a position synchronization unit which performs pulse position synchronization processing based on the selected pattern of the pulse; and

    a decoding unit which decodes the Mode S transponder transmission signal based on the pulse which has been subjected to the pulse position synchronization processing, wherein the position synchronization unit includes a correction value calculation unit which calculates a correction value of an error when the error occurs in a reference position in a case of selecting the resembling pattern of the pulse, and the pattern selection unit sequentially corrects the reference position based on the correction value.

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