1090ES signal expansion method based on phase modulation

The invention discloses a 1090ES signal expansion method based on phase modulation, and relates to the field of civil aviation air traffic management monitoring. The process of signal processing includes the following steps that data information is collected by a signal transmitting terminal, phase dual modulation is carried out on PPM and a sub-pulse, an expansion signal is transmitted, the expansion signal is received and synchronized by a signal receiving terminal, and demodulation is carried out on PPM information and phase information. The key technology and effect are characterized in that in the modulation process, a piecewise linearity phase transition method is used to solve a frequency spectrum problem caused by phase mutation, and a band width character of an expanded 1090ES signal is improved effectively; in the carrier-frequency synchronization process, twice synchronization is performed by using a front guide pulse and a four-digit pulse, the quickness and accuracy of the synchronizations are guaranteed, and a special synchronization problem of multiple output and single input of an ADS-B receiver is solved effectively; in the base band phase information demodulation process, a phase judgment method based on error forward feedback is used, and the accuracy of the phase judgment is improved effectively.