A method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method

• Main Authors: OU LEQING, ZHANG ZHONGJIANG, ZHU DONG, FU QIANLIANG, ZHAO CHUNGUANG, CHENG WEIMING, MA HAO, WANG SHOUFENG, PENG SI, ZHANG LIN
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

In a method of decoding common-frequency overlapping of 1090 ES signals based on secondary inflexion-point method of the present invention, a video signal relevant accumulation is adopted, and two rounds of inflexion-point detection is performed, to extract a secondary inflexion-point and determine a starting time and a terminating time of double overlapped pulses, so as to achieve the function of correctly decoding under the circumstance of 1090 ES signals overlapping. Since it is hard for the common-frequency overlapped pulses to be separated from the angle of the signals, the present invention considers from the time domain feature of the overlapped signals of an envelope, and recovers the frame of the original signals by determining the starting time and the terminating time of the two overlapped pulses. The present invention can technically improve the current 1090 ES ground monitoring system, achieve correct decoding under the circumstance of 1090 ES signals overlapping, and increasing the continuous monitoring ability of the ground monitoring system at the airspace with multiple targets.