A 1090es signal de-same-frequency overlapping method based on the quadratic inflection point method

Abstract

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.

Description

technical field [0001] The present invention relates to a method for removing same-frequency overlap of 1090ES signals based on a quadratic inflection point method, in particular to a method for removing same-frequency overlap of 1090ES signals based on a quadratic inflection point method. Background technique [0002] Automatic Dependent Surveillance-Broadcast (ADS-B) system is an air traffic control technology commonly used in international civil aviation systems. It is an aircraft operation monitoring system based on GPS global satellite positioning system and air-ground and air-air data link communications. The ADS-B system realizes the ground or air monitoring function of the target through the way that the aircraft actively sends its own relevant information. The International Civil Aviation Organization (ICAO) identified it as the main direction of future surveillance technology development, and the international aviation community is actively promoting the applicatio...

AI Technical Summary

Problems solved by technology

However, in the airspace near a large hub airport with a large number of targets, the probability of signal overlap is greatly increased, and signal overlap will seriously affect the accuracy and reliability of the ground surveillance system to obtain target information

At present, the ground surveillance systems developed by domestic manufacturers do not yet have the ability to decompose the same frequency overlap of 1090ES pulse signals

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