Spatial Adaptive Anti-jamming Algorithm And Its Implementation

Due to the rapid development of electronic warfare technology,the electromagnetic environment of modern communication is increasingly complex.Spatial adaptive anti-jamming has become an important way for anti-interference and been widely used in radar,navigation,communications and other fields.The array signal model and the optimal criteria based on beamforming are introduced,and the thesis introduces the classical adaptive beamforming algorithm,including the minimum mean square error(LMS)algorithm and recursive least squares(RLS)algorithm.So,the normalized constraint LMS algorithm,variable step size LMS algorithm and adaptive anti-jamming algorithm based on pattern-conformal are studied.After that,the thesis studies the application of adaptive anti-jamming algorithm in sparse array.The typical structure of one-dimensional sparse array is introduced,including nested array,coprime array and generalized coprime array.On this basis,combining the structure of sparse array and L-shaped array,the structure of sparse L-shaped array is studied,and the configuration optimal design of array element is proposed.The data models of linear sparse array and sparse L-shaped array are studied and the method of extending virtual freedom of the sparse array is introduced in the thesis.Based on LMS algorithm,the adaptive anti-jamming algorithm for linear sparse array and sparse L-shaped array are studied.Finally,the engineering realization of the adaptive anti-jamming algorithm for the satellite platform is studied and also the implementation scheme of the nulling processor is proposed.The thesis introduces the related algorithms of the nulling processor.The architecture of the nulling processor and the specific structure of each module are studied.Also the workflow of the nulling processor is studied in the thesis,results of the functional simulation and timing sequence are analyzed,and the board of the hardware is debugged in the thesis.