Implemention On Adaptive Anti-jamming Algorithm Of Satellite Navigation In FPGA

Due to such characteristics of satellite navigation like timing accuracy, highpositioning accuracy, high real-time and good continuity, it has been so widely applied tothe military, scientific research, agriculture and other fields. Having realized theimportance of satellite navigation applications, governments of all countries began toconcern about related satellite navigation technology. At present, many countries in theworld have set up its own global navigation satellite system. At existing satellitenavigation systems are Russia’s GLONASS, United States GPS, Beidou system in Chinaand the European Union (EU) Galileo. However, because of the long distance betweensatellites and Earth, complex electromagnetic environment during transmission, satellitenavigation systems are vulnerable to disturbance. In order to make a satellite navigationreceiver works correctly and demodulate useful signal in various kinds of interferencecircumstances, studying effective anti-interference technology is the urgent need toaddress the question.The thesis focuses on Beidou navigation system and discusses systematically theadaptive anti-jamming system, specially the more comprehensive description of themethod of adaptive filtering and adaptive optimization guidelines. Structure of antennaarray is analyzed in detail, through the analysis of the adaptive anti-jamming structure，thefour uniform circular array is for certain. At the same time, the array structure is optimized.The study determines the use of signal based on power inversion algorithm for linearlyconstrained minimum variance benchmark to suppress interference signals according tothe Beidou navigation features. Through the analysis of the power inversion algorithm,algorithm design process was identified, and ultimately algorithm design was given.Finally, the study deliberately discusses the FPGA realization of adaptive anti-jammingmodule theory and gives a detailed explanation of the design. In addition, results of RTLand each module waveform simulation are given. Set up test scenarios, and interferencesignal of sampling Beidou satellite to act as the input signal, and ends up with the testresults by means of modules of adaptive anti-jamming algorithm. Combining with Matlaband QuartusII, the thesis verified the correctness of the design.