Research On Radar Signal Sorting Algorithm In Complex Signal Environment

With the rapid development of radar technology and widespread use of new systemradar, radar signals environment has become dense, complex, changeable. The difficulty oftraditional signal sorting method increases, has been unable to satisfy the real-time character.In order to sort effectively radar signal from complex signal environment, this articlethoroughly researchs key algorithms of signal sorting. In face of complex environment, asignal sorting algorithm may not work well, and its result may be fuzzy. In order to solvethis problem, we study multi-algorithm sorting.Fristly, the complex electromagnetic environment of radar signal sorting is analyzed inthis paper and some traditional signal sorting technologies are introduced here. Then PRItransform method and its improved algorithm is studied because of the sub-harmonicproblems which existences of the traditional sorting algorithm. Simulation results show thatthe improved PRI transform algorithm has a good effect on separation of dithering signalsand impulse loss signal in complex environment.Secondly, independent component analysis is applied to radar signal sorting, and thispaper focuses on the research of radar signal sorting algorithm based on FastICA. Thisalgorithm is effective to the different modulation types of radar signal sorting in complexsignal environments, especially the signals reaching at the same time. This paper comes upwith a new sorting algorithm based on FastICA and wavelet transform, which is effective tothe radar signal sorting in a low SNR.Finally, according to the intra-pulse features of complex modulated radar signal arestudied, especially the method of radar signal sorting based on the wavelet ridge. Owing tothe wavelet ridge method can not correctly sorting the radar signals which have the samemodulation type and different modulation parameters, this paper puts forward the viewscombined the wavelet ridge with the improved PRI transform. Simulation shows that thisnew method is effective to kinds of unknown radar signals in complex environment.