| The primary task of air traffic management is the guarantee of all aircraft in the routeon time, safe, effective flight, in the spatial domain for the controllers, to monitor the flighttime for each aircraft in airspace. Traditional detection method by radar and pilotcommunication, through inquiry/reply way to understand the status of aircraft. From along-term development perspective, this radar system still exist some problems: there aremany radar in the ocean and desert area, the formation of these blind area is mainlybecause the radar beam travels in straight lines; for the aircraft’s planned route, speedsituation data, radar system does not currently receive, which directly affect the trackingaccuracy and ability short-term conflict alerts. Therefore, a new method for monitoring andbe imperative.The full name of ADS-B is Automatic Dependent Surveillance-Broadcast, Chinesetranslation for automatic dependent surveillance broadcast, for ATC, ADS-B system is theinformation system also has the function of monitoring and communication. At present, theinternational civil aviation organization had as surveillance technology in the future of themainstream ADS-B technology. With the development of this technology and widely used,the problems of ADS-B is becoming more and more serious, the interfering links in thedirect effect of ADS-B system on the aircraft surveillance and navigation.This paper will start from the origin of the ADS-B system, and gradually introduce itsworking principle, the use of regional, the existence of the risk and the present domesticand international research and development.ADS-B system for signal transmission to usethree links:1090ES data link, UAT, VDL-4, and then compares each data link, to concludetheir respective advantages and disadvantages.This paper takes1090ES data link as an example, the interference problems areanalyzed.Finally, this paper will use Constant Modulus Algorithm and Blind SignalExtraction to solve ADS-B link interference problem. In this process, we will select FMsignal and Mode C responsive signal as interference signal in1090ES interference problem.By Matlab simulation experiment, we can use Constant Modulus Algorithm to extract1090ES and FM signal from their mixed signal and use Blind Signal Extraction to extract1090ES and Mode C responsive signal from their mixed signal. Verifying the feasibility and validity of the two algorithms, so as to solve the interference problem of1090ES datalink. In addition, this paper has carried on the forecast to the future development trend ofADS-B system. |
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