| 摘要 |
Embodiments of the present invention provide for an overall hardware and software approach to Mode-S demodulation, especially where the Mode-S signals (such as squitters) have been modulated with multiple modulation protocols. Various implementations utilize coherent phase detection, since coherently detecting phase transitions in a multiple modulated signal results in better sensitivity and improved interference rejection over non-coherent modulation techniques. Further, addressing the demodulation of multiply-modulated signals may also be approached in embodiments of the present invention as a unified demodulation system, rather than disjoint demodulation of the separately modulated protocols.
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