Systems and methods for enhanced ATC overlay modulation

摘要

The present invention disclose systems and methods for providing an enhanced data link using overlaid modulation. The present invention is directed a method for creating a data link comprising encoding a data stream into a provided modulated signal using pulse key modulation. The provided modulated signal is phase shifted at two predetermined time intervals by a respective first and second predetermined delta phase amount to represent a particular symbol by a predefined symbol-phase relationship; and when added together the respective first and second predetermined delta phase amounts cancel to produce a net zero phase shift. The modulated signal is demodulated using pulse key modulation, wherein the predefined symbol-phase relationship is used to produce the data stream.